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K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 1 -

Rev 3.0

Nov. 2003

K7B803625B

Document Title

256Kx36 & 512Kx18-Bit Synchronous Burst SRAM

The attached data sheets are prepared and approved by SAMSUNG Electronics. SAMSUNG Electronics CO., LTD. reserve the right to change the
specifications. SAMSUNG Electronics will evaluate and reply to your requests and questions on the parameters of this device. If you have any ques-
tions, please contact the SAMSUNG branch office near your office, call or contact Headquarters.

Revision History

Rev. No.

0.0

0.1

0.2

1.0

2.0

2.1

3.0

Remark

Preliminary

Final

History

Initial draft

Add x32 org part and industrial temperature part

1. change scan order(1) form 4T to 6T at 119BGA(x18)

1. Final spec release
2. Change I

SB2

form 50mA to 60mA

Change ordering information( remove 225MHz at SPB)

1. Delete 119BGA package

1. Remove x32 organization
2. Remove -85 speed bin

Draft Date

May. 18 . 2001

Aug. 11. 2001

Aug. 28. 2001

Nov. 16. 2001

April. 01. 2002

April. 04. 2003

Nov. 17. 2003

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 2 -

Rev 3.0

Nov. 2003

K7B803625B

8Mb SB/SPB Synchronous SRAM Ordering Information

Org.

Part Number

Mode

VDD

Speed

FT ; Access Time(ns)

Pipelined ; Cycle Time(MHz)

PKG

Temp

512Kx18

K7B801825B-QC(I)65/75

3.3

6.5/7.5 ns

100TQFP

Commercial

Temperature

Range

Industrial

Temperature

Range

K7A801800B-QC(I)16/14

SPB(2E1D)

3.3

167/138 MHz

K7A801809B-QC(I)25

SPB(2E1D)

3.3

250 MHz

256Kx36

K7B803625B-QC(I)65/75

3.3

6.5/7.5 ns

K7A803600B-QC(I)16/14

SPB(2E1D)

3.3

167/138 MHz

K7A803609B-QC(I)25

SPB(2E1D)

3.3

250 MHz

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 3 -

Rev 3.0

Nov. 2003

K7B803625B

256Kx36 & 512Kx18-Bit Synchronous Burst SRAM

The K7B803625B and K7B801825B are 9,437,184-bit Synchro-
nous Static Random Access Memory designed for high perfor-
mance second level cache of Pentium and Power PC based
System.
It is organized as 256K(512K) words of 36(18) bits and inte-
grates address and control registers, a 2-bit burst address
counter and added some new functions for high performance
cache RAM applications; GW, BW, LBO, ZZ. Write cycles are
internally self-timed and synchronous.
Full bus-width write is done by GW, and each byte write is per-
formed by the combination of WEx and BW when GW is high.
And with CS1 high, ADSP is blocked to control signals.
Burst cycle can be initiated with either the address status pro-
cessor(ADSP) or address status cache controller(ADSC)
inputs. Subsequent burst addresses are generated internally in
the system

s burst sequence and are controlled by the burst

address advance(ADV) input.
LBO pin is DC operated and determines burst sequence(linear
or interleaved).
ZZ pin controls Power Down State and reduces Stand-by cur-
rent regardless of CLK.
The K7B803625B and K7B801825B are fabricated using SAM-
SUNG

s high performance CMOS technology and is available

in a 100pin TQFP and Multiple power and ground pins are uti-
lized to minimize ground bounce.

GENERAL DESCRIPTION

FEATURES

LOGIC BLOCK DIAGRAM

Synchronous Operation.

On-Chip Address Counter.

Self-Timed Write Cycle.

On-Chip Address and Control Registers.

3.3V+0.165V/-0.165V Power Supply.

· I/O Supply Voltage 3.3V+0.165V/-0.165V for 3.3V I/O
or 2.5V+0.4V/-0.125V for 2.5V I/O
·

5V Tolerant Inputs Except I/O Pins.

Byte Writable Function.

Global Write Enable Controls a full bus-width write.

Power Down State via ZZ Signal.

LBO Pin allows a choice of either a interleaved burst or a lin-

ear burst.

Three Chip Enables for simple depth expansion with No Data

Contention only for TQFP.

Asynchronous Output Enable Control.

ADSP, ADSC, ADV Burst Control Pins.

TTL-Level Three-State Output.

100-TQFP-1420A

· Operating in commeical and industrial temperature range.

CLK

LBO

ADV

ADSC

ADSP

WEx

DQa

~ DQd

or DQa0 ~ DQb7

BURST CONTROL

LOGIC

BURST

256Kx36 , 512Kx18

ADDRESS

CONTROL

DATA-IN

ADDRESS
COUNTER

MEMORY

ARRAY

REGISTER

LOGIC

CONTROL

GIS

NTROL

RE
G

I
S

or A

DQPa ~ DQPd

(x=a,b,c,d or a,b)

DQPa,DQPb

FAST ACCESS TIMES

PARAMETER

Symbol -65 -75 -85 Unit

Cycle Time

CYC

7.5 8.5

Clock Access Time

6.5 7.5 8.5

Output Enable Access Time

3.5 3.5 4.0

OUTPUT
BUFFER

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 4 -

Rev 3.0

Nov. 2003

K7B803625B

PIN CONFIGURATION

(TOP VIEW)

PIN

Notes : 1. A

and A

are the two least significant bits(LSB) of the address field and set the internal burst counter if burst is desired.

2. The pin 42 is reserved for address bit for the 16Mb .

SYMBOL

PIN NAME

TQFP PIN NO.

SYMBOL

PIN NAME

TQFP PIN NO.

- A

ADV
ADSP
ADSC
CLK
CS

WEx(x=a,b,c,d)
OE
GW
BW
ZZ
LBO

Address Inputs

Burst Address Advance
Address Status Processor
Address Status Controller
Clock
Chip Select
Chip Select
Chip Select
Byte Write Inputs
Output Enable
Global Write Enable
Byte Write Enable
Power Down Input
Burst Mode Control

32,33,34,35,36,37,43
44,45,46,47,48,49,50
81,82,99,100
83
84
85
89
98
97
92
93,94,95,96
86
88
87
64
31

N.C.

DQa

DQb

DQc

DQd

DQPa~P

DDQ

SSQ

Power Supply(+3.3V)
Ground
No Connect

Data Inputs/Outputs

Output Power Supply
(2.5V or 3.3V)
Output Ground

15,41,65,91
17,40,67,90
14,16,38,39,42,66

52,53,56,57,58,59,62,63
68,69,72,73,74,75,78,79
2,3,6,7,8,9,12,13
18,19,22,23,24,25,28,29
51,80,1,30

4,11,20,27,54,61,70,77

5,10,21,26,55,60,71,76

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

100 Pin TQFP

(20mm x 14mm)

DQPc

DQc

DDQ

SSQ

DQc

SSQ

DDQ

DQc

N.C.

DQd

DDQ

SSQ

DQd

SSQ

DDQ

DQd

DQPd

80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51

DQPb
DQb

DQb

DDQ

SSQ

DQb

SSQ

DDQ

DQb

N.C.
V

ZZ
DQa

DQa

DDQ

SSQ

DQa

SSQ

DDQ

DQa

DQPa

100

CLK

ADSC

ADSP

ADV

N.C.

LBO

K7B803625B(256Kx36)

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 5 -

Rev 3.0

Nov. 2003

K7B803625B

PIN CONFIGURATION

(TOP VIEW)

PIN NAME

Notes : 1. A

and A

are the two least significant bits(LSB) of the address field and set the internal burst counter if burst is desired.

2. The pin 42 is reserved for address bit for the 16Mb .

SYMBOL

PIN NAME

TQFP PIN NO.

SYMBOL

PIN NAME

TQFP PIN NO.

- A

ADV
ADSP
ADSC
CLK
CS

WEx
OE
GW
BW
ZZ
LBO

Address Inputs

32,33,34,35,36,37,43
44,45,46,47,48,49,50
80,81,82,99,100
83
84
85
89
98
97
92
93,94
86
88
87
64
31

N.C.

DQa

~ a

DQb

~ b

DQPa, Pb
V

DDQ

SSQ

Power Supply(+3.3V)
Ground
No Connect

Data Inputs/Outputs

Output Power Supply
(2.5V or 3.3V)
Output Ground

15,41,65,91
17,40,67,90
1,2,3,6,7,14,16,25,28,29,
30,38,39,42,51,52,53,56,
57,66,75,78,79,95,96

58,59,62,63,68,69,72,73
8,9,12,13,18,19,22,23
74,24
4,11,20,27,54,61,70,77

5,10,21,26,55,60,71,76

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

100 Pin TQFP

(20mm x 14mm)

N.C.
N.C.
N.C.

DDQ

SSQ

N.C.
N.C.

DQb

SSQ

DDQ

DQb

N.C.

DQb

DDQ

SSQ

DQb

DQPb

N.C.

SSQ

DDQ

N.C.
N.C.
N.C.

80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51

N.C.
N.C.
V

DDQ

SSQ

N.C.
DQPa
DQa

DQa

SSQ

DDQ

DQa

N.C.
V

ZZ
DQa

DQa

DDQ

SSQ

DQa

N.C.
N.C.
V

SSQ

DDQ

N.C.
N.C.
N.C.

100

N.C.

CLK

ADSC

ADSP

ADV

N.C.

LBO

K7B801825B(512Kx18)

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 6 -

Rev 3.0

Nov. 2003

K7B803625B

FUNCTION DESCRIPTION

The K7B803625B and K7B801825B are synchronous SRAM designed to support the burst address accessing sequence of the
Power PC based microprocessor. All inputs (with the exception of OE, LBO and ZZ) are sampled on rising clock edges. The start and
duration of the burst access is controlled by ADSC, ADSP and ADV and chip select pins.
The accesses are enabled with the chip select signals and output enabled signals. Wait states are inserted into the access with ADV.

When ZZ is pulled high, the SRAM will enter a Power Down State. At this time, internal state of the SRAM is preserved. When ZZ
returns to low, the SRAM normally operates after 2cycles of wake up time. ZZ pin is pulled down internally.

Read cycles are initiated with ADSP(or ADSC) using the new external address clocked into the on-chip address register when both
GW and BW are high or when BW is low and WEa, WEb, WEc, and WEd are high. When ADSP is sampled low, the chip selects are
sampled active, and the output buffer is enabled with OE. the data of cell array accessed by the current address are projected to the
output pins.

Write cycles are also initiated with ADSP(or ADSC) and are differentiated into two kinds of operations; All byte write operation and
individual byte write operation.
All byte write occurs by enabling GW(independent of BW and WEx.), and individual byte write is performed only when GW is high
and BW is low. In K7B803625B, a 256Kx36 organization, WEa controls DQa0 ~ DQa7 and DQPa, WEb controls DQb0 ~ DQb7 and
DQPb, WEc controls DQc0 ~ DQc7 and DQPc and WEd controls DQd0 ~ DQd7 and DQPd.

is used to enable the device and conditions internal use of ADSP and is sampled only when a new external address is loaded.

ADV is ignored at the clock edge when ADSP is asserted, but can be sampled on the subsequent clock edges. The address
increases internally for the next access of the burst when ADV is sampled low.

Addresses are generated for the burst access as shown below, The starting point of the burst sequence is provided by the external
address. The burst address counter wraps around to its initial state upon completion. The burst sequence is determined by the state
of the LBO pin. When this pin is Low, linear burst sequence is selected. And this pin is High, Interleaved burst sequence is selected.

BURST SEQUENCE TABLE

(Interleaved Burst)

LBO PIN

HIGH

Case 1

Case 2

Case 3

Case 4

First Address

Fourth Address

0
0
1
1

0
1
0
1

0
0
1
1

1
0
1
0

1
1
0
0

0
1
0
1

1
1
0
0

1
0
1
0

BQ TABLE

(Linear Burst)

Note : 1. LBO pin must be tied to High or Low, and Floating State must not be allowed

LBO PIN

LOW

Case 1

Case 2

Case 3

Case 4

First Address

Fourth Address

0
0
1
1

0
1
0
1

0
1
1
0

1
0
1
0

1
1
0
0

0
1
0
1

1
0
0
1

1
0
1
0

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 7 -

Rev 3.0

Nov. 2003

K7B803625B

SYNCHRONOUS TRUTH TABLE

Notes : 1. X means "Don

t Care". 2. The rising edge of clock is symbolized by .

3. WRITE = L means Write operation in WRITE TRUTH TABLE.

WRITE = H means Read operation in WRITE TRUTH TABLE.

4. Operation finally depends on status of asynchronous input pins(ZZ and OE).

ADSP ADSC

ADV

WRITE

CLK

ADDRESS ACCESSED

OPERATION

N/A

Not Selected

N/A

Not Selected

N/A

Not Selected

N/A

Not Selected

N/A

Not Selected

External Address

Begin Burst Read Cycle

External Address

Begin Burst Write Cycle

External Address

Begin Burst Read Cycle

Next Address

Continue Burst Read Cycle

Next Address

Continue Burst Read Cycle

Next Address

Continue Burst Write Cycle

Next Address

Continue Burst Write Cycle

Current Address

Suspend Burst Read Cycle

Current Address

Suspend Burst Read Cycle

Current Address

Suspend Burst Write Cycle

Current Address

Suspend Burst Write Cycle

WRITE TRUTH TABLE

( x36)

Notes : 1. X means "Don

t Care".

2. All inputs in this table must meet setup and hold time around the rising edge of CLK(

WEa

WEb

WEc

WEd

OPERATION

READ

WRITE BYTE a

WRITE BYTE b

WRITE BYTE c and d

WRITE ALL BYTEs

TRUTH TABLES

WRITE TRUTH TABLE

(x18)

Notes : 1. X means "Don

t Care".

2. All inputs in this table must meet setup and hold time around the rising edge of CLK(

WEa

WEb

OPERATION

READ

WRITE BYTE a

WRITE BYTE b

WRITE ALL BYTEs

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 8 -

Rev 3.0

Nov. 2003

K7B803625B

CAPACITANCE*

=25

°C, f=1MHz)

*Note : Sampled not 100% tested.

PARAMETER

SYMBOL

TEST CONDITION

MIN

MAX

UNIT

Input Capacitance

=0V

Output Capacitance

OUT

=0V

ASYNCHRONOUS TRUTH TABLE

Operation

I/O STATUS

Sleep Mode

High-Z

Read

High-Z

Write

Din, High-Z

Deselected

High-Z

Notes
1. X means "Don

t Care".

2. ZZ pin is pulled down internally
3. For write cycles that following read cycles, the output buffers must be

disabled with OE, otherwise data bus contention will occur.

4. Sleep Mode means power down state of which stand-by current does

not depend on cycle time.

5. Deselected means power down state of which stand-by current

depends on cycle time.

OPERATING CONDITIONS at 3.3V I/O

°C T

70°C)

* The above parameters are also guaranteed at industrial temperature range.

PARAMETER

SYMBOL

MIN

Typ.

MAX

UNIT

Supply Voltage

3.135

3.3

3.465

DDQ

3.135

3.3

3.465

Ground

OPERATING CONDITIONS at 2.5V I/O

°C T

70°C)

* The above parameters are also guaranteed at industrial temperature range.

PARAMETER

SYMBOL

MIN

Typ.

MAX

UNIT

Supply Voltage

3.135

3.3

3.465

DDQ

2.375

2.5

2.9

Ground

ABSOLUTE MAXIMUM RATINGS*

*Note : Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only

and functional operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

PARAMETER

SYMBOL

RATING

UNIT

Voltage on V

Supply Relative to V

-0.3 to 4.6

Voltage on V

DDQ

Supply Relative to V

DDQ

Voltage on Input Pin Relative to V

-0.3 to V

+0.3

Voltage on I/O Pin Relative to V

-0.3 to V

DDQ

+0.3

Power Dissipation

1.6

Storage Temperature

STG

-65 to 150

°C

Operating Temperature

Commercial

OPR

0 to 70

°C

Industrial

OPR

-40 to 85

°C

Storage Temperature Range Under Bias

BIAS

-10 to 85

°C

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 9 -

Rev 3.0

Nov. 2003

K7B803625B

SS-

1.0V

20% t

CYC

(MIN)

DC ELECTRICAL CHARACTERISTICS

=3.3V+0.165V/-0.165V, T

°C to +70°C)

Notes : The above parameters are also guaranteed at industrial temperature range.
1. Reference AC Operating Conditions and Characteristics for input and timing.
2. Data states are all zero.
3. In Case of I/O Pins, the Max. V

DDQ

+0.3V

Parameter

Symbol

Test Conditions

Min

Max

Unit

Notes

Input Leakage Current(except ZZ)

=Max ; V

to V

-2

µA

Output Leakage Current

Output Disabled, V

out

to V

DDQ

-2

µA

Operating Current

Device Selected, I

OUT

=0mA,

IL ,

Cycle Time

CYC

Min

-65 -

300

1,2

-75 -

280

Standby Current

Device deselected, I

OUT

=0mA,

, f=Max, All Inputs

0.2V or

-0.2V

-65

140

-75 -

130

SB1

Device deselected, I

OUT

=0mA, ZZ

0.2V, f=0,

All Inputs=fixed (V

-0.2V or 0.2V)

100

SB2

Device deselected, I

OUT

=0mA, ZZ

-0.2V,

f=Max, All Inputs

Output Low Voltage(3.3V I/O)

=8.0mA

0.4

Output High Voltage(3.3V I/O)

=-4.0mA

2.4

Output Low Voltage(2.5V I/O)

=1.0mA

0.4

Output High Voltage(2.5V I/O)

=-1.0mA

2.0

Input Low Voltage(3.3V I/O)

-0.3*

0.8

Input High Voltage(3.3V I/O)

2.0

+0.3

Input Low Voltage(2.5V I/O)

-0.3*

0.7

Input High Voltage(2.5V I/O)

1.7

+0.3

=3.3V+0.165V/-0.165V,V

DDQ

=3.3V+0.165/-0.165V or V

=3.3V+0.165V/-0.165V,V

DDQ

=2.5V+0.4V/-0.125V, T

=0to70

°C)

TEST CONDITIONS

* The above parameters are also guaranteed at industrial temperature range.

PARAMETER

VALUE

Input Pulse Level(for 3.3V I/O)

0 to 3.0V

Input Pulse Level(for 2.5V I/O)

0 to 2.5V

Input Rise and Fall Time(Measured at 20% to 80% for 3.3V I/O)

1.0V/ns

Input Rise and Fall Time(Measured at 20% to 80% for 2.5V I/O)

1.0V/ns

Input and Output Timing Reference Levels for 3.3V I/O

1.5V

Input and Output Timing Reference Levels for 2.5V I/O

DDQ

Output Load

See Fig. 1

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 10 -

Rev 3.0

Nov. 2003

K7B803625B

AC TIMING CHARACTERISTICS

=3.3V+0.165V/-0.165V, T

°C to +70°C)

Notes : 1. The above parameters are also guaranteed at industrial temperature range.
2. All address inputs must meet the specified setup and hold times for all rising clock edges whenever ADSC and/or ADSP is sampled low and CS

is sampled low. All other synchronous inputs must meet the specified setup and hold times whenever this device is chip selected.

3. Both chip selects must be active whenever ADSC or ADSP is sampled low in order for the this device to remain enabled.
4. ADSC or ADSP must not be asserted for at least 2 Clock after leaving ZZ state.

PARAMETER

SYMBOL

-65

-75

UNIT

MIN

MAX

MIN

MAX

Cycle Time

CYC

7.5

8.5

Clock Access Time

6.5

7.5

Output Enable to Data Valid

3.5

Clock High to Output Low-Z

LZC

2.5

Output Hold from Clock High

2.5

Output Enable Low to Output Low-Z

LZOE

Output Enable High to Output High-Z

HZOE

3.5

Clock High to Output High-Z

HZC

3.8

4.0

Clock High Pulse Width

2.2

2.5

Clock Low Pulse Width

2.2

2.5

Address Setup to Clock High

1.5

2.0

Address Status Setup to Clock High

1.5

2.0

Data Setup to Clock High

1.5

2.0

Write Setup to Clock High (GW, BW, WE

)

1.5

2.0

Address Advance Setup to Clock High

ADVS

1.5

2.0

Chip Select Setup to Clock High

CSS

1.5

2.0

Address Hold from Clock High

0.5

Address Status Hold from Clock High

0.5

Data Hold from Clock High

0.5

Write Hold from Clock High (GW, BW, WE

)

0.5

Address Advance Hold from Clock High

ADVH

0.5

Chip Select Hold from Clock High

CSH

0.5

ZZ High to Power Down

PDS

cycle

ZZ Low to Power Up

PUS

cycle

Output Load(B),
(for t

LZC

, t

LZOE

, t

HZOE

& t

HZC

)

Dout

353

/ 1538

5pF*

+3.3V for 3.3V I/O

319

/ 1667

Fig. 1

* Including Scope and Jig Capacitance

Output Load(A)

Dout

Zo=50

RL=50

VL=1.5V for 3.3V I/O
V

DDQ

/2 for 2.5V I/O

/+2.5V for 2.5V I/O

30pF*

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 11 -

Rev 3.0

Nov. 2003

K7B803625B

CLOCK

ADSP

ADSC

ADDR

ESS

WRI

ADV

Data

Out

TIMING WAVEFOR

M OF RE

AD CYCLE

ES : WRIT

= L

ans GW

or GW

= H, B

= L, WE

= L

ans

= L,

H and

= H

mea

= H, o

r

C

= L and CS

H, or

L
,
and

URS

T C

I
N

I
TH

ASE

ESS

ADV

HZOE

LZOE

INSE

IT S

HZC

Q3-

Q2-

-3

Q2-

Q1-

Don

t Ca

r
e

Undef

ine

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 12 -

Rev 3.0

Nov. 2003

K7B803625B

CLOCK

ADSP

ADSC

ADDRESS

WRI

ADV

Data In

Data Ou

NDE

D BU

RST)

D2-

D1-

CSH

)

-2

D2-

D3-1

-
2

D3-3

D2-

D3-

-3

Q0-4

MING

WAVEFORM OF WRTE CYCL

Don

t Care

Und

fi
ned

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 14 -

Rev 3.0

Nov. 2003

K7B803625B

TIMING WAVE

FORM OF SINGLE

AD/WRITE CYC

(
ADSC

CONTROLLE

, ADSP

=HIGH)

CLOCK

ADSC

ADDR

ESS

WRI

ADV

HZOE

-
1

Out

-
1

7
-1

Q3-

Q1-

Q2-

4
-1

Q8-

Q9-

Don

t Care

Und

fi
ned

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 17 -

Rev 3.0

Nov. 2003

K7B803625B

APPLICATION INFORMATION

DEPTH EXPANSION

Data

Address

CLK

ADS

CLK

ADSC

WEx

Address Data

ADV

ADSP

256Kx36
SB
SRAM

(Bank 0)

CLK

ADSC

WEx

Address Data

ADV

ADSP

256Kx36
SB
SRAM

(Bank 1)

CLK

Address

Cache
Controller

[0:18]

[18]

[0:17]

[18]

[0:17]

I/O

[0:71]

Microprocessor

CLOCK

ADSP

ADDRESS

Data Out

INTERLEAVE READ TIMING

(Refer to non-interleave write timing for interleave write timing)

Bank 0 is selected by CS

, and Bank 1 deselected by CS

Q1-1

Q1-2

Q1-4

Q1-3

Data Out

WRITE

n+1

ADV

(Bank 0)

(Bank 1)

Q2-1

Q2-2

Q2-4

Q2-3

CSS

CSH

ADVS

ADVH

LZOE

HZC

Bank 0 is deselected by CS

, and Bank 1 selected by CS

[0:n]

Don

t Care

Undefined

LZC

The Samsung 256Kx36 Synchronous Burst SRAM has two additional chip selects for simple depth expansion.
This permits easy secondary cache upgrades from 256K depth to 512K depth without extra logic.

(ADSP CONTROLLED , ADSC=HIGH)

*Notes : n = 14 32K depth , 15 64K depth
16 128K depth , 17 256K depth
18 512K depth

K7B801825B

256Kx36 & 512Kx18 Synchronous SRAM

- 18 -

Rev 3.0

Nov. 2003

K7B803625B

APPLICATION INFORMATION

The Samsung 512Kx18 Synchronous Burst SRAM has two additional chip selects for simple depth expansion.

DEPTH EXPANSION

This permits easy secondary cache upgrades from 512K depth to 1M depth without extra logic.

Data

Address

CLK

ADS

Microprocessor

CLK

ADSC

WEx

Address Data

ADV

ADSP

512Kx18
SB
SRAM

(Bank 0)

CLK

ADSC

WEx

Address Data

ADV

ADSP

512Kx18
SB
SRAM

(Bank 1)

CLK

Address

Cache
Controller

[0:19]

[19]

[0:18]

[19]

[0:18]

I/O

[0:71]

CLOCK

ADSP

ADDRESS

Data Out

INTERLEAVE READ TIMING

(Refer to non-interleave write timing for interleave write timing)

Bank 0 is selected by CS

, and Bank 1 deselected by CS

Q1-1

Q1-2

Q1-4

Q1-3

Data Out

WRITE

n+1

ADV

(Bank 0)

(Bank 1)

Q2-1

Q2-2

Q2-4

Q2-3

CSS

CSH

ADVS

ADVH

LZOE

HZC

Bank 0 is deselected by CS

, and Bank 1 selected by CS

[0:n]

Don

t Care

Undefined

LZC

(ADSP CONTROLLED , ADSC=HIGH)

*Notes : n = 14 32K depth , 15 64K depth
16 128K depth , 17 256K depth
18 512K depth , 19 1M depth

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: K7B801825B

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: K7B801825B