1
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
PRELIMINARY
Some of contents are subject to change without notice.
DESCRIPTION
M2S56D20AKT is a 4-bank x 16,777,216-word x 4-bit,
M2S56D30AKT is a 4-bank x 8,388,608-word x 8-bit,
M2S56D40AKT is a 4-bank x 4,194,304-word x 16-bit,
double data rate synchronous DRAM, with SSTL_2 interface. All control and address signals are
referenced to the rising edge of CLK. Input data is registered on both edges of data strobe, and output
data and data strobe are referenced on both edges of CLK. The M2S56D20/30/40AKT achieves very
high speed data rate up to 133MHz, and are suitable for main memory in computer systems.
FEATURES
- Vdd=Vddq=2.5V+0.2V
- Double data rate architecture;
two data transfers per clock cycle
- Bidirectional, data strobe (DQS) is transmitted/received with data
- Differential clock inputs (CLK and /CLK)
- DLL aligns DQ and DQS transitions
with CLK transitions edges of DQS
- Commands entered on each positive CLK edge;
- data and data mask referenced to both edges of DQS
- 4 bank operation controlled by BA0, BA1 (Bank Address)
- /CAS latency- 2.0/2.5 (programmable)
- Burst length- 2/4/8 (programmable)
- Burst type- sequential / interleave (programmable)
- Auto precharge / All bank precharge controlled by A10
- 8192 refresh cycles /64ms (4 banks concurrent refresh)
- Auto refresh and Self refresh
- Row address A0-12 / Column address A0-9,11(x4)/ A0-9(x8)/ A0-8(x16)
- SSTL_2 Interface
- 400-mil, 66-pin Thin Small Outline Package (TSOP II)
- JEDEC standard
125MHz
100MHz
-10
CL=2.5 *
CL=2 *
133MHz
133MHz
133MHz
-75A
100MHz
-75
Clock Rate
Speed
Grade
Operating Frequencies
* CL = CAS(Read) Latency
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MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
CLK,/CLK
: Master Clock
CKE
: Clock Enable
/CS
: Chip Select
/RAS
: Row Address Strobe
/CAS
: Column Address Strobe
/WE
: Write Enable
DQ0-7
: Data I/O
DQS
: Data Strobe
DM
: Write Mask
Vref
: Reference Voltage
A0-12
: Address Input
BA0,1
: Bank Address Input
Vdd
: Power Supply
VddQ
: Power Supply for Output
Vss
: Ground
VssQ
: Ground for Output
PIN CONFIGURATION(TOP VIEW)
VDD
VDD
VDD
NC
DQ0
DQ0
VDDQ
VDDQ
VDDQ
NC
NC
DQ1
DQ0
DQ1
DQ2
VSSQ
VSSQ
VSSQ
NC
NC
DQ3
NC
DQ2
DQ4
VDDQ
VDDQ
VDDQ
NC
NC
DQ5
DQ1
DQ3
DQ6
VSSQ
VSSQ
VSSQ
NC
NC
DQ7
NC
NC
LDQS
NC
NC
NC
VDD
VDD
VDD
NC
NC
NC
NC
NC
LDM
/WE
/WE
/WE
/CAS
/CAS
/CAS
/RAS
/RAS
/RAS
/CS
/CS
/CS
NC
NC
NC
BA0
BA0
BA0
BA1
BA1
BA1
A10/AP
A10/AP A10/AP
A0
A0
A0
A1
A1
A1
A2
A2
A2
A3
A3
A3
VDD
VDD
VDD
VSS
VSS
VSS
DQ15
DQ7
NC
VSSQ VSSQ VSSQ
DQ14
NC
NC
DQ13
DQ6
DQ3
VDDQ VDDQ VDDQ
DQ12
NC
NC
DQ11
DQ5
NC
VSSQ VSSQ VSSQ
DQ10
NC
NC
DQ9
DQ4
DQ2
VDDQ VDDQ VDDQ
DQ8
NC
NC
NC
NC
NC
VREF VREF VREF
VSS
VSS
VSS
UDM
DM
DM
/CLK
/CLK
/CLK
CLK
CLK
CLK
CKE
CKE
CKE
NC
NC
NC
A12
A12
A12
A11
A11
A11
A9
A9
A9
A8
A8
A8
A7
A7
A7
A6
A6
A6
A5
A5
A5
A4
A4
A4
VSS
VSS
VSS
X 8
X 16
X 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
64
pin STSOP
PIN PITCH 0.4 mm
VDDQ
VDDQ
VDDQ
UDQS
DQS
DQS
VSSQ VSSQ VSSQ
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MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
PIN FUNCTION
CLK, /CLK
Input
Clock: CLK and /CLK are differential clock inputs. All address and control
input signals are sampled on the crossing of the positive edge of CLK and
negative edge of /CLK. Output (read) data is referenced to the crossings of
CLK and /CLK (both directions of crossing).
CKE
Input
Clock Enable: CKE controls internal clock. When CKE is low, internal clock
for the following cycle is ceased. CKE is also used to select auto / self refresh.
After self refresh mode is started, CKE becomes asynchronous input. Self refresh
is maintained as long as CKE is low.
/CS
Input
Chip Select: When /CS is high, any command means No Operation.
/RAS, /CAS, /WE
Input
Combination of /RAS, /CAS, /WE defines basic commands.
A0-12
Input
A0-11 specify the Row / Column Address in conjunction with BA0,1. The
Row Address is specified by A0-12. The Column Address is specified by
A0-9,11(x4), A0-9(x8) and A0-8(x16). A10 is also used to indicate precharge
option. When A10 is high at a read / write command, an auto precharge is
performed. When A10 is high at a precharge command, all banks are
precharged.
BA0,1
Input
DQ0-15(x16),
DQ0-7(x8),
DQ0-3(x4),
Input / Output
DQS
Vdd, Vss
Power Supply
Power Supply for the memory array and peripheral circuitry.
VddQ, VssQ
Power Supply
VddQ and VssQ are supplied to the Output Buffers only.
Bank Address: BA0,1 specifies one of four banks to which a command is
applied. BA0,1 must be set with ACT, PRE, READ, WRITE commands.
Data Input/Output: Data bus
Data Strobe: Output with read data, input with write data. Edge-aligned
with read data, centered in write data. Used to capture write data.
For the x16, LDQS corresponds to the data on DQ0-DQ7; UDQS
correspond to the data on DQ8-DQ15
S Y M B O L
TYPE
DESCRIPTION
DM
Input
Input Data Mask: DM is an input mask signal for write data. Input data
is masked when DM is sampled HIGH along with that input data
during a WRITE access. DM is sampled on both edges of DQS.
Although DM pins are input only, the DM loading matches the DQ
and DQS loading. For the x16, LDM corresponds to the data on DQ0-DQ7;
UDM corresponds to the data on DQ8-DQ15.
Input / Output
Vref
Input
SSTL_2 reference voltage.
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MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Type Designation Code
This rule is applied to only Synchronous DRAM family.
Mitsubishi Main Designation
Speed Grade
10: 125 MHz@CL=2.5,100MHz@CL=2.0
75:
133 MHz@CL=2.5
,100MHz@CL=2.0
Package Type TP: TSOP(II)
Process Generation
Function Reserved for Future Use
Organization 2 n
2: x4, 3: x8, 4: x16
D DR Synchronous DRAM
Density 56: 256M bits
Interface V:LVTTL, S:SSTL_3, _2
Memory Style (DRAM)
M 2 S 56 D 3 0 A TP 75A
B L O C K D I A G R A M
/CS
/RAS /CAS
/ WE
UDM,
L D M
Memory
Array
Bank #0
DQ0 - 15
I/O Buffer
Memory
Array
Bank #1
Memory
Array
Bank #2
Memory
Array
Bank #3
Mode Register
Control Circuitry
Address Buffer
A 0-12
BA0,1
Clock Buffer
C L K
C K E
Control Signal Buffer
QS Buffer
UDQS,LDQS
DLL
75 A: 133MHz@CL=2.5,
133MHz@CL=2.0
/C L K
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MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
BASIC FUNCTIONS
The M2S56D20/30/40AKT provides basic functions, bank (row) activate, burst read / write, bank
(row) precharge, and auto / self refresh. Each command is defined by control signals of /RAS,
/CAS and /WE at CLK rising edge. In addition to 3 signals, /CS ,CKE and A10 are used as chip
select, refresh option, and precharge option, respectively. To know the detailed definition of
commands, please see the command truth table.
/CS
Chip Select : L=select, H=deselect
/RAS
Command
/CAS
Command
/WE
Command
CKE
Refresh Option @refresh command
A10
Precharge Option @precharge or read/write command
CLK
define basic commands
/CLK
Activate (ACT) [/RAS =L, /CAS =/WE =H]
ACT command activates a row in an idle bank indicated by BA.
Read (READ) [/RAS =H, /CAS =L, /WE =H]
READ command starts burst read from the active bank indicated by BA. First output data appears after
/CAS latency. When A10 =H at this command, the bank is deactivated after the burst read (auto-
precharge, READA)
Write (WRITE) [/RAS =H, /CAS =/WE =L]
WRITE command starts burst write to the active bank indicated by BA. Total data length to be written
is set by burst length. When A10 =H at this command, the bank is deactivated after the burst write
(auto-precharge, WRITEA)
Precharge (PRE) [/RAS =L, /CAS =H, /WE =L]
PRE command deactivates the active bank indicated by BA. This command also terminates burst read
/write operation. When A10 =H at this command, all banks are deactivated (precharge all, PREA ).
Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H]
REFA command starts auto-refresh cycle. Refresh address including bank address are generated
internally. After this command, the banks are precharged automatically.
6
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
C O M M A N D T R U T H T A B L E
H=High Level, L=Low Level, V=Valid, X=Don't Care, n=CLK cycle number
NOTE:
1. Applies only to read bursts with autoprecharge disabled; this command is undefined (and should not be used) for
read bursts with autoprecharge enabled, and for write bursts.
2. BA0-BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register;BA0=1 ,
BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A12 provide the
op-code to be written to the selected Mode Register.
COMMAND
MNEMONIC
CKE
n-1
CKE
n
/CS
/RAS
/CAS
/WE
BA0,1
A10
/AP
A0-9,
11-12
Deselect
DESEL
H
X
H
X
X
X
X
X
X
No Operation
NOP
H
X
L
H
H
H
X
X
X
Row Address Entry &
Bank Activate
ACT
H
H
L
L
H
H
V
V
V
Single Bank Precharge
PRE
H
H
L
L
H
L
V
L
X
Precharge All Banks
PREA
H
H
L
L
H
L
H
X
Column Address Entry
& Write
WRITE
H
H
L
H
L
L
V
L
V
Column Address Entry
& Write with
Auto-Precharge
WRITEA
H
H
L
H
L
L
V
H
V
Column Address Entry
& Read
READ
H
H
L
H
L
H
V
L
V
Column Address Entry
& Read with
Auto-Precharge
READA
H
H
L
H
L
H
V
H
V
Auto-Refresh
REFA
H
H
L
L
L
H
X
X
X
Self-Refresh Entry
REFS
H
L
L
L
L
H
X
X
X
Self-Refresh Exit
REFSX
L
H
H
X
X
X
X
X
X
L
H
L
H
H
H
X
X
X
Burst Terminate
TERM
H
H
L
H
H
L
X
X
X
Mode Register Set
MRS
H
H
L
L
L
L
L
L
V
X
note
1
2
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MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
F U N C T I O N T R U T H T A B L E
Current State
/CS /RAS / C A S / W E Address
Command
Action
Notes
IDLE
H
X
X
X
X
DESEL
N O P
L
H
H
H
X
N O P
N O P
L
H
H
L
BA
TERM
ILLEGAL
2
L
H
L
X
BA, CA, A10
READ / WRITE
ILLEGAL
2
L
L
H
H
BA, RA
A C T
Bank Active, Latch RA
L
L
H
L
BA, A10
PRE / PREA
N O P
4
L
L
L
H
X
REFA
Auto-Refresh
5
L
L
L
L
O p - C o d e , M o d e -
Add
MRS
Mode Register Set
5
R O W A C T I V E
H
X
X
X
X
DESEL
N O P
L
H
H
H
X
N O P
N O P
L
H
H
L
BA
TERM
N O P
L
H
L
H
BA, CA, A10
READ / READA
Begin Read, Latch CA, Determine
Auto-Precharge
L
H
L
L
BA, CA, A10
WRITE / WRITEA
Begin Write, Latch CA, Determine
Auto-Precharge
L
L
H
H
BA, RA
A C T
Bank Active / ILLEGAL
2
L
L
H
L
BA, A10
PRE / PREA
Precharge / Precharge All
L
L
L
H
X
REFA
ILLEGAL
L
L
L
L
O p - C o d e , M o d e -
Add
MRS
ILLEGAL
H
X
X
X
X
DESEL
NOP (Continue Burst to END)
L
H
H
H
X
N O P
NOP (Continue Burst to END)
L
H
H
L
BA
TERM
Terminate Burst
L
H
L
H
BA, CA, A10
READ / READA
Terminate Burst, Latch CA, Begin
New Read, Determine Auto-
Precharge
3
L
H
L
L
BA, CA, A10
WRITE / WRITEA
ILLEGAL
L
L
H
H
BA, RA
A C T
Bank Active / ILLEGAL
2
L
L
H
L
BA, A10
PRE / PREA
Terminate Burst, Precharge
L
L
L
H
X
REFA
ILLEGAL
L
L
L
L
O p - C o d e , M o d e -
Add
MRS
ILLEGAL
READ(Auto-
Precharge
Disabled)
8
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE (continued)
Current State
/CS /RAS /CAS /WE Address
Command
Action
Notes
H
X
X
X X
DESEL
NOP (Continue Burst to END)
L
H
H
H X
NOP
NOP (Continue Burst to END)
L
H
H
L
BA
TERM
ILLEGAL
L
H
L
H BA, CA, A10
READ / READA
Terminate Burst, Latch CA, Begin
Read, Determine Auto-Precharge
3
L
H
L
L
BA, CA, A10
WRITE / WRITEA
Terminate Burst, Latch CA, Begin
Write, Determine Auto-Precharge
3
L
L
H
H BA, RA
ACT
Bank Active / ILLEGAL
2
L
L
H
L
BA, A10
PRE / PREA
Terminate Burst, Precharge
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
H
X
X
X X
DESEL
NOP (Continue Burst to END)
L
H
H
H X
NOP
NOP (Continue Burst to END)
L
H
H
L
BA
TERM
ILLEGAL
L
H
L
H BA, CA, A10
READ / READA
ILLEGAL for Same Bank
6
L
H
L
L
BA, CA, A10
WRITE / WRITEA
ILLEGAL for Same Bank
6
L
L
H
H BA, RA
ACT
Bank Active / ILLEGAL
2
L
L
H
L
BA, A10
PRE / PREA
Precharge / ILLEGAL
2
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
H
X
X
X X
DESEL
NOP (Continue Burst to END)
L
H
H
H X
NOP
NOP (Continue Burst to END)
L
H
H
L
BA
TERM
ILLEGAL
L
H
L
H BA, CA, A10
READ / READA
ILLEGAL for Same Bank
7
L
H
L
L
BA, CA, A10
WRITE / WRITEA
ILLEGAL for Same Bank
7
L
L
H
H BA, RA
ACT
Bank Active / ILLEGAL
2
L
L
H
L
BA, A10
PRE / PREA
Precharge / ILLEGAL
2
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
WRITE(Auto-
Precharge
Disabled)
READ with
Auto-Precharge
WRITE with
Auto-Precharge
9
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE (continued)
Current State
/CS /RAS /CAS /WE Address
Command
Action
Notes
H
X
X
X X
DESEL
NOP (Idle after tRP)
L
H
H
H X
NOP
NOP (Idle after tRP)
L
H
H
L BA
TERM
ILLEGAL
2
L
H
L
X BA, CA, A10
READ / WRITE
ILLEGAL
2
L
L
H
H BA, RA
ACT
ILLEGAL
2
L
L
H
L BA, A10
PRE / PREA
NOP (Idle after tRP)
4
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
H
X
X
X X
DESEL
NOP (Row Active after tRCD)
L
H
H
H X
NOP
NOP (Row Active after tRCD)
L
H
H
L BA
TERM
ILLEGAL
2
L
H
L
X BA, CA, A10
READ / WRITE
ILLEGAL
2
L
L
H
H BA, RA
ACT
ILLEGAL
2
L
L
H
L BA, A10
PRE / PREA
ILLEGAL
2
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
H
X
X
X X
DESEL
NOP
L
H
H
H X
NOP
NOP
L
H
H
L BA
TERM
ILLEGAL
2
L
H
L
X BA, CA, A10
READ / WRITE
ILLEGAL
2
L
L
H
H BA, RA
ACT
ILLEGAL
2
L
L
H
L BA, A10
PRE / PREA
ILLEGAL
2
L
L
L
H X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
ROW
ACTIVATING
WRITE RE-
COVERING
PRE-
CHARGING
10
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE (continued)
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
BA=Bank Address, RA=Row Address, CA=Column Address, NOP=No Operation
NOTES:
1. All entries assume that CKE was High during the preceding clock cycle and the current clock cycle.
2. ILLEGAL to bank in specified state; function may be legal in the bank indicated by BA, depending on the state of
that bank.
3. Must satisfy bus contention, bus turn around, write recovery requirements.
4. NOP to bank precharging or in idle state. May precharge bank indicated by BA.
5. ILLEGAL if any bank is not idle.
6. Refer to Read with Auto -Precharge in page 24.
7. Refer to Write with Auto-Precharge in page 26.
ILLEGAL = Device operation and/or data-integrity are not guaranteed.
Current State
/CS /RAS /CAS /WE Address
Command
Action
Notes
REFRESHING
H
X
X
X
X
DESEL
NOP (Idle after tRC)
L
H
H
H
X
N O P
NOP (Idle after tRC)
L
H
H
L
BA
TERM
ILLEGAL
L
H
L
X
BA, CA, A10
READ / WRITE
ILLEGAL
L
L
H
H
BA, RA
A C T
ILLEGAL
L
L
H
L
BA, A10
PRE / PREA
ILLEGAL
L
L
L
H
X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
H
X
X
X
X
DESEL
NOP (Row Active after tRSC)
L
H
H
H
X
N O P
NOP (Row Active after tRSC)
L
H
H
L
BA
TERM
ILLEGAL
L
H
L
X
BA, CA, A10
READ / WRITE
ILLEGAL
L
L
H
H
BA, RA
A C T
ILLEGAL
L
L
H
L
BA, A10
PRE / PREA
ILLEGAL
L
L
L
H
X
REFA
ILLEGAL
L
L
L
L
Op-Code, Mode-
Add
MRS
ILLEGAL
MODE
REGISTER
SETTING
11
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE for CKE
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
NOTES:
1. CKE Low to High transition will re-enable CLK and other inputs asynchronously.
A minimum setup time must be satisfied before any command other than EXIT.
2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.
3. Must be legal command.
Current State
C K E n - 1
C K E n
/ C S
/RAS
/CAS
/ W E
Address
Action
Notes
H
X
X
X
X
X
X
I N V A L I D
1
L
H
H
X
X
X
X
Exit Self-Refresh (Idle after tRC)
1
L
H
L
H
H
H
X
Exit Self-Refresh (Idle after tRC)
1
L
H
L
H
H
L
X
I L L E G A L
1
L
H
L
H
L
X
X
I L L E G A L
1
L
H
L
L
X
X
X
I L L E G A L
1
L
L
X
X
X
X
X
NOP (Maintain Self-Refresh)
1
H
X
X
X
X
X
X
I N V A L I D
L
H
X
X
X
X
X
Exit Power Down to Idle
L
L
X
X
X
X
X
NOP (Maintain Self-Refresh)
H
H
X
X
X
X
X
Refer to Function Truth Table
2
H
L
L
L
L
H
X
Enter Self-Refresh
2
H
L
H
X
X
X
X
Enter Power Down
2
H
L
L
H
H
H
X
Enter Power Down
2
H
L
L
H
H
L
X
I L L E G A L
2
H
L
L
H
L
X
X
I L L E G A L
2
H
L
L
L
X
X
X
I L L E G A L
2
L
X
X
X
X
X
X
Refer to Current State =Power Down
2
H
H
X
X
X
X
X
Refer to Function Truth Table
H
L
X
X
X
X
X
Begin CLK Suspend at Next Cycle
3
L
H
X
X
X
X
X
Exit CLK Suspend at Next Cycle
3
L
L
X
X
X
X
X
Maintain CLK Suspend
A N Y S T A T E
other than listed
above
S E L F -
R E F R E S H I N G
P O W E R
D O W N
A L L B A N K S
IDLE
12
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
SIMPLIFIED STATE DIAGRAM
ROW
ACTIVE
IDLE
PRE
CHARGE
POWER
DOWN
READ
READA
WRITE
WRITEA
POWER
ON
ACT
REFA
REFS
REFSX
CKEL
C K E H
M R S
CKEL
C K E H
WRITE
R E A D
WRITEA
WRITEA
R E A D A
R E A D
PRE
R E A D A
R E A D A
PRE
PRE
PREA
P O W E R
APPLIED
MODE
REGISTER
SET
SELF
REFRESH
AUTO
REFRESH
Active
Power
Down
Automatic Sequence
Command Sequence
WRITE
R E A D
PRE
CHARGE
ALL
M R S
BURST
STOP
TERM
13
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
P O W E R O N S E Q U E N C E
Before starting normal operation, the following power on sequence is necessary to prevent a
SDRAM from damaged or multifunctioning.
1. Apply VDD before or the same time as VDDQ
2. Apply VDDQ before or at the same time as VTT & Vref
3. Maintain stable condition for 200us after stable power and CLK, apply NOP or DSEL
4. Issue precharge command for all banks of the device
5. Issue EMRS
6. Issue MRS for the Mode Register and to reset the DLL
7. Issue 2 or more Auto Refresh commands
8. Maintain stable condition for 200 cycle
After these sequence, the DDR SDRAM is idle state and ready for normal operation.
MODE REGISTER
Burst Length, Burst Type and /CAS Latency can be
programmed by setting the mode register (MRS). The mode
register stores these data until the next MRS command, which
may be issued when both banks are in idle state. After tMRD
from a MRS command, the DDR SDRAM is ready for new
command.
/CS
/RAS
/CAS
/WE
A11-A0
/CLK
CLK
BA0
BA1
R: Reserved for Future Use
0
NO
1
YES
DLL Reset
0
Sequential
1
Interleaved
Burst Type
BT=0
BT=1
0 0 0
R
R
0 0 1
2
2
0 1 0
4
4
0 1 1
8
8
1 0 0
R
R
1 0 1
R
R
1 1 0
R
R
1 1 1
R
R
BL
Burst
Length
/CAS Latency
0 0 0
R
0 0 1
R
0 1 0
2
0 1 1
R
1 0 0
R
1 0 1
R
1 1 0
2.5
1 1 1
R
CL
Latency
Mode
BA1 BA0 A12 A11 A10 A 9
A 8
A 7
A 6
A 5
A 4
A 3 A 2
A 1
A 0
0
0
0
0
0
0
D R
0
B T
LTMODE
B L
V
14
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
EXTENDED MODE REGISTER
DLL disable / enable mode can be programmed by setting the extended
mode register (EMRS). The extended mode register stores these data
until the next EMRS command, which may be issued when all banks are
in idle state. After tMRD from a EMRS command, the DDR SDRAM is
ready for new command.
/CS
/RAS
/CAS
/WE
A11-A0
BA0
BA1
/CLK
CLK
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0
1
0
0
0
0
0
0
0
0
0
0
0
DS
DD
0
Normal
1
Weak
Drive
Strength
0
DLL Enable
1
DLL Disable
DLL Disable
V
15
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
/CAS
Latency
Burst
Length
CL= 2
BL= 4
Burst
Length
A2
A1 A0
Initial Address
BL
Sequential
Interleaved
Column Addressing
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
-
0
0
-
0
1
-
1
0
-
1
1
-
-
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
1
2
3
4
5
6
7
0
1
0
3
2
5
4
7
6
2
3
4
5
6
7
0
1
2
3
0
1
6
7
4
5
3
4
5
6
7
0
1
2
3
2
1
0
7
6
5
4
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
5
6
7
0
1
2
3
4
5
4
7
6
1
0
3
2
6
7
0
1
2
3
4
5
6
7
4
5
2
3
0
1
7
0
1
2
0
1
2
3
1
2
3
0
2
3
0
1
3
0
0
1
7
6
5
4
0
1
2
3
1
0
3
2
2
3
0
1
3
2
0
1
-
-
1
1
2
1
0
3
4
5
6
3
2
1
0
1
0
1
0
8
4
2
Command
Address
DQ
Y
Y
Read
Write
DQS
Q0 Q1 Q2 Q3
D0 D1 D2 D3
/CLK
CLK
16
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
ABSOLUTE MAXIMUM RATINGS
D C OPERATING CONDITIONS
(Ta=0 ~ 70
o
C, unless otherwise noted)
C A P A C I T A N C E
(Ta=0 ~ 70
o
C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, unless otherwise noted)
Min. Max.
CI(A)
Input Capacitance, address pin
VI=1.25v
2.0
3.0
pF
11
CI(C)
Input Capacitance, control pin
f=100MHz
2.0
3.0
pF
11
CI(K)
Input Capacitance, CLK pin
VI=25mVrms
2.0
3.0
0.25
pF
11
CI/O
I/O Capacitance, I/O, DQS, DM pin
4.0
5.0
0.50
pF
11
0.50
Notes
Limits
Symbol
Parameter
Test Condition
Unit
Delta
Cap.(Max.)
Min.
Typ.
Max.
Vdd
Supply Voltage
2.3
2.5
2.7
V
VddQ
Supply Voltage for Output
2.3
2.5
2.7
V
Vref
Input Reference Voltage
0.49*VddQ 0.50*VddQ 0.51*VddQ
V
5
VIH(DC)
High-Level Input Voltage
Vref + 0.15
VddQ+0.3
V
VIL(DC)
Low-Level Input Voltage
-0.3
Vref - 0.15
V
VIN(DC)
Input Voltage Level, CLK and /CLK
-0.3
VddQ + 0.3
V
VID(DC) Input Differential Voltage, CLK and /CLK
0.36
VddQ + 0.6
V
7
VTT
I/O Termination Voltage
Vref - 0.04
Vref + 0.04
V
6
Notes
Limits
Symbol
Parameter
Unit
Symbol
Parameter
Conditions
Ratings
Unit
Vdd
Supply Voltage
with respect to Vss
-0.5 ~ 3.7
V
VddQ
Supply Voltage for Output
with respect to VssQ
-0.5 ~ 3.7
V
VI
Input Voltage
with respect to Vss
-0.5 ~ Vdd+0.5
V
VO
Output Voltage
with respect to VssQ
-0.5 ~ VddQ+0.5
V
IO
Output Current
50
mA
Pd
Power Dissipation
Ta = 25
o
C
1000
mW
Topr
Operating Temperature
0 ~ 70
o
C
Tstg
Storage Temperature
-65 ~ 150
o
C
17
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
-75A
-75
-10
x4
105
105
100
x8
110
110
105
x16
120
120
115
x4
110
110
105
x8
115
115
110
x16
135
135
130
60
60
55
65
65
60
75
75
70
x4
150
150
140
x8
170
170
160
x16
210
210
200
x4
145
145
135
x8
165
165
155
x16
200
200
180
IDD5
AUTO REFRESH CURRENT: t RC = t RFC (MIN)
x4/x8/x16
185
185
175
IDD6
SELF REFRESH CURRENT: CKE < 0.2V
x4/x8/x16
3
3
3
x4
250
250
230
20
x8
260
260
240
20
x16
290
290
280
20
x4/x8/x16
IDD2P
IDD2F
IDLE STANDBY CURRENT: /CS > VIH (MIN); All banks idle;
CKE > VIH (MIN); t CK = t CK MIN; Address and other control inputs changing
once per clock cycle
IDD4R
OPERATING CURRENT: Burst = 2; Reads; Continuous burst;One bank active;
Address and control inputs changing once per clock cycle;CL=2.5; t CK = t CK
MIN; IOUT = 0 mA
PRECHARGE POWER-DOWN STANDBY CURRENT: All banks idle; power-
down mode; CKE <VIL (MAX); t CK = t CK MIN
ACTIVE STANDBY CURRENT: /CS > VIH (MIN); CKE > VIH (MIN); One
bank; Active-Precharge; t RC = t RAS MAX; t CK = t CK MIN; DQ,DM and
DQS inputs changing twice per clock cycle; address and other control inputs
changing once per clock cycle
IDD3N
Notes
IDD0
IDD1
OPERATING CURRENT: One Bank; Active-Read-Precharge;
Burst = 2; t RC = t RC MIN; CL = 2.5; t CK = t CK MIN; IOUT= 0mA;
Address and control inputs changing once per clock cycle
Symbol
Organization
Parameter/Test Conditions
OPERATING CURRENT: One Bank; Active-Precharge; t RC = t RC MIN; t CK
= t CK MIN; DQ, DM and DQS inputs changing twice per clock cycle; address
and control inputs changing once per clock cycle
20
20
Limits(Max.)
mA
20
30
Unit
40
40
30
30
40
IDD7
OPERATING CURRENT-Four bank Operation: Four bank interleaving with
BL=4 -Refer to the Notes 20
x4/x8/x16
IDD4W
OPERATING CURRENT: Burst = 2; Writes; Continuous burst; One bank active;
Address and control inputs changing once per clock cycle; CL=2.5; t CK = t CK
MIN;DQ, DM and DQS inputs changing twice per clock cycle
x4/x8/x16
x4/x8/x16
IDD3P
ACTIVE POWER-DOWN STANDBY CURRENT: One bank active; power-
down mode; CKE < VIL (MAX); t CK = t CK MIN
AVERAGE SUPPLY CURRENT from Vdd
(Ta=0 ~ 70
o
C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, Output Open, unless otherwise noted)
AC OPERATING CONDITIONS AND CHARACTERISTICS
(Ta=0 ~ 70
o
C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, Output Open, unless otherwise noted)
Min.
Max.
VIH(AC) High-Level Input Voltage (AC)
Vref + 0.31
VIL(AC) Low-Level Input Voltage (AC)
Vref - 0.31
VID(AC) Input Differential Voltage, CLK and /CLK
0.7
VddQ + 0.6
7
VIX(AC) Input Crossing Point Voltage, CLK and /CLK
0.5*VddQ - 0.2 0.5*VddQ + 0.2
8
IOZ
Off-state Output Current /Q floating Vo=0~VddQ
-5
5
A
II
Input Current / VIN=0 ~ VddQ
-2
2
A
IOH
Output High Current (VOUT = VTT+0.84V)
-16.8
IOL
Output High Current (VOUT = VTT-0.84V)
16.8
mA
mA
Notes
Limits
V
V
V
Symbol
Parameter / Test Conditions
Unit
V
18
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
AC TIMING REQUIREMENTS
(Ta=0 ~ 70
o
C, Vdd = VddQ = 2.5V +0.2V, Vss = VssQ = 0V, unless otherwise noted)
Min.
Max
Min.
Max
Min.
Max
tAC
DQ Output Valid data delay time from CLK//CLK
-0.75
0.75
-0.75
0.75
-0.8
0.8
ns
tDQSCK DQ Output Valid data delay time from CLK//CLK
-0.75
0.75
-0.75
0.75
-0.8
0.8
ns
tCH
CLK High level width
0.45
0.55
0.45
0.55
0.45
0.55
tCK
tCL
CLK Low level width
0.45
0.55
0.45
0.55
0.45
0.55
tCK
CL=2.5
7.5
15
7.5
15
8
15
ns
CL=2
7.5
15
10
15
10
15
ns
tDS
Input Setup time (DQ,DM)
0.5
0.5
0.6
ns
tDH
Input Hold time(DQ,DM)
0.5
0.5
0.6
ns
tDIPW
DQ and DM input pulse width (for each input)
1.75
1.75
2
ns
tHZ
Data-out-high impedance time from CLK//CLK
-0.75
0.75
-0.75
0.75
-0.8
0.8
ns
14
tLZ
Data-out-low impedance time from CLK//CLK
-0.75
0.75
-0.75
0.75
-0.8
0.8
ns
14
tDQSQ DQ Valid data delay time from DQS
0.5
0.5
0.6
ns
tHP
Clock half period
tCLmin or
tCHmin
tCLmin or
tCHmin
tCLmin or
tCHmin
ns
tQH
Output DQS valid window
tHP-0.75
tHP-0.75
tHP-1.0
ns
tDQSS
Write command to first DQS latching transition
0.75
1.25
0.75
1.25
0.75
1.25
tCK
tDQSH DQS input High level width
0.35
0.35
0.35
tCK
tDQSL DQS input Low level width
0.35
0.35
0.35
tCK
tDSS
DQS falling edge to CLK setup time
0.2
0.2
0.2
tCK
tDSH
DQS falling edge hold time from CLK
0.2
0.2
0.2
tCK
tMRD
Mode Register Set command cycle time
15
15
15
ns
tWPRES Write preamble setup time
0
0
0
ns
16
tWPST Write postamble
0.4
0.6
0.4
0.6
0.4
0.6
tCK
15
tWPRE Write preamble
0.25
0.25
0.25
tCK
tIS
Input Setup time (address and control)
0.9
0.9
1.1
ns
19
tIH
Input Hold time (address and control)
0.9
0.9
1.1
ns
19
tRPST
Read postamble
0.4
0.6
0.4
0.6
0.4
0.6
tCK
tRPRE
Read preamble
0.9
1.1
0.9
1.1
0.9
1.1
tCK
-10
Unit
Notes
tCK
CLK cycle time
Symbol
AC Characteristics Parameter
-75A
-75
19
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
AC TIMING REQUIREMENTS(Continues)
(Ta=0 ~ 70
o
C, Vdd = VddQ = 2.5V +0.2V, Vss = VssQ = 0V, unless otherwise noted)
Min.
Max
Min.
Max
Min.
Max
tRAS
Row Active time
45
120,000
45
120,000
50
120,000
ns
tRC
Row Cycle time(operation)
65
65
70
ns
tRFC
Auto Ref. to Active/Auto Ref. command period
75
75
80
ns
tRCD
Row to Column Delay
20
20
20
ns
tRP
Row Precharge time
20
20
20
ns
tRRD
Act to Act Delay time
15
15
15
ns
tWR
Write Recovery time
15
15
15
ns
tDAL
Auto Precharge write recovery + precharge time
35
35
35
ns
tWTR
Internal Write to Read Command Delay
1
1
1
tCK
tXSNR Exit Self Ref. to non-Read command
75
75
80
ns
tXSRD Exit Self Ref. to -Read command
200
200
200
tCK
tXPNR Exit Power down to command
1
1
1
tCK
tXPRD Exit Power down to -Read command
1
1
1
tCK
18
tREFI
Average Periodic Refresh interval
7.8
7.8
7.8
s
17
-10
Unit
Notes
Symbol
AC Characteristics Parameter
-75A
-75
Output Load Condition
DQ
Output Timing
Measurement
Reference Point
V
REF
V
REF
DQS
V
O U T
V
REF
30pF
50
V
TT
=V
REF
Zo=50
20
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Notes
1. All voltages referenced to Vss.
2. Tests for AC timing, IDD, and electrical, AC and DC characteristics, may be conducted at nominal reference/supply
voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified.
3. AC timing and IDD tests may use a VIL to VIH swing of up to 1.5V in the test environment, but input timing is still
referenced to VREF (or to the crossing point for CK//CK), and parameter specifications are guaranteed for the
specified AC input levels under normal use conditions. The minimum slew rate for the input signals is 1V/ns in the
range between VIL(AC) and VIH(AC).
4. The AC and DC input level specifications are as defined in th e SSTL_2 Standard (i.e. the receiver will effectively
switch as a result of the signal crossing the AC input level, and will remain in that state as long as the signal does not
ring back above (below) the DC input LOW (HIGH) level.
5. VREF is expected to be equal to 0.5*VddQ of the transmitting device, and to track variations in the DC level of the
same. Peak-to-peak noise on VREF may not exceed +2% of the DC value.
6. VTT is not applied directly to the device. VTT is a system su pply for signal termination resistors, is expected to be
set equal to VREF, and must track variations in the DC level of VREF.
7. VID is the magnitude of the difference between the input level on CLK and the input level on /CLK.
8. The value of VIX is expected to equal 0.5*VddQ of the transmitting device and must track variations in the DC level
of the same.
9. Enables on-chip refresh and address counters.
10. IDD specifications are tested after the device is properly initialized.
11. This parameter is sampled. VddQ = 2.5V+0.2V, Vdd = 2.5V + 0.2V , f = 100 MHz, Ta = 25
o
C, VOUT(DC) =
VddQ/2, VOUT(PEAK TO PEAK) = 25mV. DM inputs are grouped with I/O pins - reflecting the fact that they are
matched in loading (to facilitate trace matching at the board level).
12. The CLK//CLK input reference level (for timing referenced to CLK//CLK) is the point at which CLK and /CLK
cross; the input reference level for signals other than CLK//CLK, is VREF.
13. Inputs are not recognized as valid until VREF stabilizes. Exception: during the period before VREF stabilizes,
CKE< 0.3VddQ is recognized as LOW.
14. t HZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are not
referenced to a specific voltage level, but specify when the device output is no longer driving (HZ), or begins driving
(LZ).
15. The maximum limit for this parameter is not a device limit. The device will operate with a greater value for this
parameter, but system performance (bus turnaround) will degrade accordingly.
16. The specific requirement is that DQS be valid (HIGH, LOW, or at some point on a valid transition) on or before
this CLK edge. A valid transition is defined as monotonic, and meeting the input slew rate specifications of the device.
When no writes were previously in progress on the bus, DQS will be transitioning from High-Z to logic LOW. If a
previous write was in progress, DQS could be HIGH, LOW, or transitioning from HIGH to LOW at this time,
depending on tDQSS.
17. A maximum of eight AUTO REFRESH commands can be posted to any given DDR SDRAM device.
18. tXPRD should be 200 tCLK in the condition of the unstable CLK operation during the power down mode.
19. For command/address and CK & /CK slew rate > 1.0V/ns.
20. IDD7 : Operating current:Four Bank
For Bank are being interleaved with tRC(min),Burst Mode,Address and Control inputs on NOP edge are not
changing.Iout = 0mA
Timing patterns:
tCK=min,tRRD=2*tCK,BL=4,tRCD=3*tCK,Read with Autoprecharge
Read:A0 N A1 R0 A2 R1 N R3 A0 N A1 R0 repeat the same timing with random address changing
*100% of data changing at every burst
Legend: A=Activate,R=Read,P=Precharge,N=NOP
21
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
/CLK
DQS
tIS
tIH
VREF
CLK
Valid Data
Read Operation
tAC
tDQSCK
tCL
tCH
tCK
tDQSQ
tQH
tRPRE
tRPST
DQS
/CLK
CLK
tDQSS
tDS
tDH
tDQSL
tDQSH
tWPRE
Write Operation / tDQSS=max.
tDSS
tWPRES
tWPST
DQS
/CLK
CLK
tDQSS
tDS
tDH
tDQSL
tDQSH
tWPRE
Write Operation / tDQSS=min.
tDSH
tWPRES
tWPST
DQ
DQ
DQ
Cmd &
Add.
22
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
The DDR SDRAM has four independent banks. Each bank is activated by the ACT command with
the bank addresses (BA0,1). A row is indicated by the row address A12-0. The minimum activation
interval between one bank and the other bank is tRRD.
BANK ACTIVATE
OPERATIONAL DESCRIPTION
The PRE command deactivates the bank indicated by BA0,1. When multiple banks are active, the
precharge all command (PREA,PRE+A10=H) is available to deactivate them at the same time. After
tRP from the precharge, an ACT command to the same bank can be issued.
PRECHARGE
Bank Activation and Precharge All (BL=8, CL=2)
A precharge command can be issued at BL/2 from a read command without data loss.
Precharge all
Command
A0-9,11
A10
BA0,1
DQ
ACT
Xa
Xa
00
R E A D
Y
0
00
ACT
Xb
Xb
01
PRE
tRRD
tRCD
1
ACT
Xb
Xb
01
tRAS
tRP
tRCmin
2 ACT command / tRCmin
DQS
Q a 0
BL/2
Q a 1
Q a 2
Q a 3
Q a 4
Q a 5
Q a 6
Q a 7
/CLK
CLK
23
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
After tRCD from the bank activation, a READ command can be issued. 1st Output data is available
after the /CAS Latency from the READ, followed by (BL-1) consecutive data when the Burst Length
is BL. The start address is specified by A11,A9-A0(x4)/A9-A0(x8)/A8-A0(x16), and the address
sequence of burst data is defined by the Burst Type. A READ command may be applied to any
active bank, so the row precharge time (tRP) can be hidden behind continuous output data by
interleaving the multiple banks. When A10 is high at a READ command, the auto-precharge
(READA) is performed. Any command(READ,WRITE,PRE,ACT) to the same bank is inhibited till
the internal precharge is complete. The internal precharge starts at BL/2 after READA. The next
ACT command can be issued after (BL/2+tRP) from the previous READA.
READ
Multi Bank Interleaving READ (BL=8, CL=2)
/CLK
Command
A0-9,11
A10
BA0,1
DQ
ACT
Xa
Xa
00
R E A D
Y
0
00
R E A D
Y
0
10
ACT
Xb
Xb
10
PRE
0
00
tRCD
/CAS latency
Burst Length
DQS
Q a 0
CLK
Q a 1
Q a 2
Q a 3
Q a 4
Q a 5
Q a 6
Q a 7
Q b 0
Q b 1
Q b 2
Q b 3
Q b 4
Q b 5
Q b 7
Q b 8
24
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
READ with Auto-Precharge (BL=8, CL=2,2.5)
A0-9,11
A10
BA0,1
DQ
Xa
Xa
00
Y
1
00
DQS
Internal Precharge Start Timing
Q a 0
Q a 1
Q a 2
Q a 3
Q a 4
Q a 5
Q a 6
Q a 7
DQ
DQS
Q a 0
Q a 1
Q a 2
Q a 3
Q a 4
Q a 5
Q a 6
Q a 7
CL=2
CL=2.5
tRCD
tRP
BL/2
BL/2 + tRP
Command
ACT
R E A D A
/CLK
CLK
0
1
2
3
4
5
6
7
8
9
10
11
12
Operating description when new command asserted.
Legal
Legal
Illegal
Illegal
Illegal
Illegal
Illegal
Illegal
WRITEA(CL=2.5)
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Illegal
Illegal
Illegal
Illegal
Illegal
WRITE(CL=2)
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PCG
Legal
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ACT
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Illegal
Illegal
Illegal
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Illegal
WRITEA(CL=2)
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Illegal
Illegal
Illegal
Illegal
WRITE(CL=2.5)
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R E A D A
Legal
10
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9
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8
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7
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6
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5
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4
3
Legal
R E A D
For Different Bank
Asserted
Command
25
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
After tRCD from the bank activation, a WRITE command can be issued. 1st input data is set from
the WRITE command with data strobe input, following (BL-1) data are written into RAM, when
the Burst Length is BL. The start address is specified by A11,A9-A0(x4)/A9-A0(x8)/A8-A0(x16),
and the address sequence of burst data is defined by the Burst Type. A WRITE command may be
applied to any active bank, so the row precharge time (tRP) can be hidden behind continuous input
data by interleaving the multiple banks. From the last data to the PRE command, the write recovery
time (tWRP) is required. When A10 is high at a WRITE command, the auto-precharge(WRITEA) is
performed. Any command(READ,WRITE,PRE,ACT) to the same bank is inhibited till the internal
precharge is complete. The next ACT command can be issued after tDAL from the last input data
cycle.
WRITE
Multi Bank Interleaving WRITE (BL=8)
Command
A0-9,11
A10
BA0,1
DQ
ACT
Xa
00
WRITE
00
WRITE
0
0
10
ACT
Xb
10
0
10
tRCD
D
tRCD
D
PRE
Xa
0
00
PRE
DQS
/CLK
CLK
D a 0
D a 1
D a 2
D a 3
D a 4
D a 5
D a 6
D a 7
D b 0
D b 1
D b 2
D b 3
D b 4
D b 5
D b 6
D b 7
Xa
Ya
Yb
Xb
26
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
WRITE with Auto-Precharge (BL=8)
Command
A0-9,11
A10
BA0,1
DQ
ACT
Xa
00
WRITEA
1
00
ACT
Xb
00
tRC
D
D a 0
DQS
/CLK
CLK
D a 1
D a 2
D a 3
D a 4
D a 5
D a 6
D a 7
tDAL
Xa
Y
Xb
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PCG
Legal
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ACT
Legal
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WRITEA
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WRITE
Legal
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Illegal
Illegal
Illegal
Illegal
Illegal
R E A D A
Legal
10
Legal
9
Legal
8
Illegal
7
Illegal
6
Illegal
5
Illegal
4
3
Illegal
R E A D
For Different Bank
Asserted
Command
0
1
2
3
4
5
6
7
8
9
10
11
12
Operating description when new command asserted.
27
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
BURST INTERRUPTION
[Read Interrupted by Read]
Burst read operation can be interrupted by new read of any bank. Random column access is allowed.
READ to READ interval is minimum 1CLK.
Read Interrupted by Read (BL=8, CL=2)
Command
A0-9,11
A10
BA0,1
DQ
Yi
R E A D R E A D
R E A D
R E A D
Yj
Yk
Yl
0
0
0
0
00
10
00
01
DQS
Q a i 0
Q a i 1
Q a j 0
Q a j 1
Q a j 2
Q a j 3 Q a k 0 Q a k 1 Q a k 2
Q a k 3 Q a k 4 Q a k 5
Q a l 0
Q a l 1
Q a l 2
Q a l 3
Q a l 4
Q a l 5
Q a l 6
Q a l 7
/CLK
CLK
[Read Interrupted by precharge]
Burst read operation can be interrupted by precharge of the same bank. READ to PRE interval is
minimum 1 CLK. A PRE command to output disable latency is equivalent to the /CAS Latency.
As a result, READ to PRE interval determines valid data length to be output. The figure below
shows examples of BL=8.
Read Interrupted by Precharge (BL=8)
CL=2.5
Command
DQS
Command
DQ
Command
DQ
Q0
Q1
Q2
Q3
Q0
Q1
/CLK
CLK
DQ
Q0
Q1
Q2
Q3
Q4
Q5
PRE
R E A D
R E A D
PRE
R E A D
PRE
DQS
DQS
28
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Read Interrupted by Precharge (BL=8)
CL=2.0
/CLK
CLK
Command
DQS
Command
DQ
Command
DQ
Q0
Q1
Q2
Q3
Q0
Q1
DQ
Q0
Q1
Q2
Q3
Q4
Q5
PRE
R E A D
R E A D
PRE
R E A D
PRE
DQS
DQS
29
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Burst read operation can be interrupted by a burst stop command(TERM). READ to TERM interval
is minimum 1 CLK. A TERM command to output disable latency is equivalent to the /CAS Latency.
As a result, READ to TERM interval determines valid data length to be output. The figure below
shows examples of BL=8.
[Read Interrupted by Burst Stop]
Read Interrupted by TERM (BL=8)
CL=2.5
Command
DQS
Command
DQ
Command
DQ
Q0
Q1
Q2
Q3
Q0
Q1
/CLK
CLK
DQ
Q0
Q1
Q2
Q3
Q4
Q5
TERM
R E A D
R E A D
TERM
R E A D
TERM
DQS
DQS
CL=2.0
Command
DQS
Command
DQ
Command
DQ
Q0
Q1
Q2
Q3
Q0
Q1
DQ
Q0
Q1
Q2
Q3
Q4
Q5
TERM
R E A D
R E A D
TERM
R E A D
TERM
DQS
DQS
30
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
[Read Interrupted by Write with TERM]
Read Interrupted by TERM (BL=8)
CL=2.5
Command
DQ
Q0
Q1
Q2
Q3
/CLK
CLK
R E A D
T E R M
DQS
WRITE
D 0
D1
D2
D3
D4
D5
CL=2.0
Command
DQ
Q0
Q1
Q2
Q3
R E A D
T E R M
DQS
WRITE
D0
D1
D2
D3
D4
D5
D6
D7
31
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Burst write operation can be interrupted by write of any bank. Random column access is allowed.
WRITE to WRITE interval is minimum 1 CLK.
[Write interrupted by Write]
[Write interrupted by Read]
Burst write operation can be interrupted by read of the same or the other bank. Random column
access is allowed. Internal WRITE to READ command interval(tWTR) is minimum 1 CLK. The
input data on DQ at the interrupting READ cycle is "don't care". tWTR is referenced from the first
positive edge after the last data input.
Write Interrupted by Read (BL=8, CL=2.5)
Command
A0-9,11
A10
BA0,1
DQ
WRITE
Yi
0
00
R E A D
Yj
0
00
D a i 0
D a i 1
Q a j 0
Q a j 1 Q a j 2
Q a j 3
QS
Q a j 4
Q a j 5
Q a j 6
Q a j 7
DM
tWTR
/CLK
CLK
Write Interrupted by Write (BL=8)
Command
A0-9,11
A10
BA0,1
WRITE
Yi
0
00
WRITE
Yk
0
10
WRITE
Yj
0
00
WRITE
Yl
0
00
DQ
D a i 1
D a j 1
D a j 3
D a k 1
D a k 3
D a k 5
D a l 1
DQS
D a l 2 D a l 3
D a l 5 D a l 6
D a l 7
D a l 4
D a l 0
D a k 4
D a k 2
D a k 0
D a i 0
D a j 0
D a j 2
/CLK
CLK
32
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Burst write operation can be interrupted by precharge of the same or all bank. Random column
access is allowed. tWR is referenced from the first positive CLK edge after the last data input.
[Write interrupted by Precharge]
Write Interrupted by Precharge (BL=8, CL=2.5)
Command
A0-9,11
A10
BA0,1
DQ
WRITE
Yi
0
00
PRE
00
D a i 0
D a i 1
QS
DM
tWR
/CLK
CLK
33
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
[Initialize and Mode Register sets]
Command
/CLK
CLK
EMRS
PRE
NOP
M R S
PRE
AR
AR
M R S
ACT
Code
Code
Xa
Code
Xa
1 0
Xa
A0-9,11
A10
Code
1
BA0,1
DQS
DQ
1
0 0
0 0
Code
tMRD
tMRD
tRP
tRFC
tRFC
tMRD
Mode Register Set,
Reset DLL
Extended Mode
Register Set
[AUTO REFRESH]
Single cycle of auto-refresh is initiated with a REFA(/CS=/RAS=/CAS=L,/WE=CKE=H)
command. The refresh address is generated internally. 8192 REFA cycles within 64ms refresh
256Mbits memory cells. The auto-refresh is performed on 4 banks concurrently. Before performing
an auto refresh, all banks must be in the idle state. Auto-refresh to auto-refresh interval is minimum
tRFC . Any command must not be supplied to the device before tRFC from the REFA command.
Auto-Refresh
/RAS
CKE
/CS
/CAS
/WE
A0-11
BA0,1
NOP or DESELECT
tRFC
Auto Refresh on All Banks
Auto Refresh on All Banks
/CLK
CLK
CKE
Initialize and MRS
34
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
[SELF REFRESH]
Self -refresh mode is entered by issuing a REFS command (/CS=/RAS=/CAS=L,/WE=H,CKE=L).
Once the self-refresh is initiated, it is maintained as long as CKE is kept low. During the self-
refresh mode, CKE is asynchronous and the only enable input, all other inputs including CLK are
disabled and ignored, so that power consumption due to synchronous inputs is saved. To exit the
self-refresh, supplying stable CLK inputs, asserting DESEL or NOP command and then asserting
CKE for longer than tXSNR/tXSRD.
Self-Refresh
/RAS
CKE
/CS
/CAS
/WE
A0-11
BA0,1
tXSNR
Self Refresh Exit
/CLK
CLK
X
Y
X
Y
tXSRD
35
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
The purpose of CLK suspend is power down. CKE is synchronous input except during the self-
refresh mode. A command at cycle is ignored. From CKE=H to normal function, DLL recovery time
is NOT required in the condition of the stable CLK operation during the power down mode.
[Power DOWN]
/CLK
CLK
Power Down by CKE
Command
PRE
CKE
Command
ACT
CKE
Standby Power Down
NOP
NOP
Valid
NOP
NOP
Valid
Active Power Down
DM is defined as the data mask for writes. During writes,DM masks input data word by word. DM
to write mask latency is 0.
[DM CONTROL]
DM Function(BL=8,CL=2)
Command
DQS
DQ
DM
WRITE
R E A D
D0
D1
D3
D4
D5
D6
D7
masked by DM=H
Don't Care
Q2
Q3
Q4
Q5
/CLK
CLK
Q0
Q1
Q6
tXPNR/tXPRD
36
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
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Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable,
but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal
injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with
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37
MITSUBISHI ELECTRIC
Jul. '01 Preliminary
MITSUBISHI LSIs
DDR SDRAM (Rev.1.0)
M2S56D20/ 30/ 40AKT
256 M Double Data Rate Synchronous DRAM
Revision History
Jul. '01
Date
-New registration (Jul. `01)
1.0
Description
Rev.
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