W49F102
64K
16 CMOS FLASH MEMORY
Publication Release Date: February 19, 2002
- 1 - Revision A4
GENERAL DESCRIPTION
The W49F102 is a 1-megabit, 5-volt only CMOS flash memory organized as 64K
16 bits. The device
can be programmed and erased in-system with a standard 5V power supply. A 12-volt V
PP
is not
required. The unique cell architecture of the W49F102 results in fast program/erase operations with
extremely low current consumption (compared to other comparable 5-volt flash memory products). The
device can also be programmed and erased using standard EPROM programmers.
FEATURES
Single 5-volt operations:
-
5-volt Read
-
5-volt Erase
-
5-volt Program
Fast Program operation:
-
Word-by-Word programming: 50
S (max.)
Fast Erase operation: 100 mS (typ.)
Fast Read access time: 45 nS
Endurance: 10K cycles (typ.)
Ten-year data retention
Hardware data protection
8K word Boot Block with Lockout protection
Low power consumption
-
Active current: 25 mA (typ.)
-
Standby current: 20
A (typ.)
Automatic program and erase timing with
internal V
PP
generation
End of program or erase detection
-
Toggle bit
-
Data polling
Latched address and data
TTL compatible I/O
JEDEC standard word-wide pinouts
Available packages: 40-pin STSOP
(10X14mm) and 44-pin PLCC
W49F102
- 2 -
PIN CONFIGURATIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Vss
A8
A7
A15
A14
A13
A12
A11
A10
A9
#OE
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
Vss
40-pin
STSOP
24
23
22
21
D
Q
15
N
C
V
D
D
#
W
E
1
4
A
1
5
A
N
C
N
C
#
C
E
D
Q
14
D
Q
13
11
12
13
39
38
37
36
35
34
33
44
1
2
3
4
5
6
26
25
24
23
22
21
20
44-pin
PLCC
28
27
40
41
42
43
7
8
9
A9
Vss
NC
A8
A7
A6
A5
A13
A12
A11
A10
10
14
15
16
17
19
18
32
31
30
29
Vss
DQ12
DQ11
DQ10
DQ9
DQ8
DQ7
DQ6
DQ5
DQ4
NC
D
Q
3
D
Q
2
#
O
E
N
C
A
0
A
1
A
2
A
3
A
4
D
Q
1
D
Q
0
NC
#WE
V
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
DD
NC
#CE
A6
A5
A4
A3
A2
A1
A0
BLOCK DIAGRAM
CONTROL
OUTPUT
BUFFER
DECODER
MAIN
MEMORY
#CE
#OE
#WE
A0
.
.
A15
.
.
DQ0
DQ15
V
DD
V
SS
(56K Words)
BootBlock
(8K Words)
PIN DESCRIPTION
SYMBOL
PIN NAME
A0
-
A15
Address Inputs
DQ0
-
DQ15 Data Inputs/Outputs
#CE
Chip Enable
#OE Output Enable
#WE
Write Enable
V
DD
Power Supply
V
SS
Ground
NC
No Connection
W49F102
Publication Release Date: February 19, 2002
- 3 - Revision A4
FUNCTIONAL DESCRIPTION
Read Mode
The read operation of the W49F102 is controlled by #CE and #OE, both of which have to be low for the
host to obtain data from the outputs. #CE is used for device selection. When #CE is high, the chip is
de-selected and only standby power will be consumed. #OE is the output control and is used to gate
data from the output pins. The data bus is in high impedance state when either #CE or #OE is high.
Refer to the timing waveforms for further details.
Boot Block Operation
There is one 8K-word boot block in this device, which can be used to store boot code. It is located in
the first 8K words of the memory with the address range from 0000 hex to 1FFF hex.
See Command Codes for Boot Block Lockout Enable for the specific code. Once this feature is set the
data for the designated block cannot be erased or programmed (programming lockout); other memory
locations can be changed by the regular programming method. Once the boot block programming
lockout feature is activated, the chip erase function will only affect the main memory.
In order to detect whether the boot block feature is set on the 8K-words block, users can perform
software command sequence: enter the product identification mode (see Command Codes for
Identification/Boot Block Lockout Detection for specific code), and then read from address "0002 hex".
If the output data is "FF hex," the boot block programming lockout feature is activated; if the output
data is "FE hex," the lockout feature is inactivated and the block can be erased/programmed.
To return to normal operation, perform a three-byte command sequence (or an alternate single-word
command) to exit the identification mode. For the specific code, see Command Codes for
Identification/Boot Block Lockout Detection.
Chip Erase Operation
The chip-erase mode can be initiated by a six-word command sequence. After the command loading
cycle, the device enters the internal chip erase mode, which is automatically timed and will be
completed in a fast 100 mS (typical). The host system is not required to provide any control or timing
during this operation. If the boot block programming lockout is activated, only the data in the main
memory will be erased to FF(hex), and the data in the boot block will not be erased (remains same as
before the chip erase operation). The entire memory array (main memory and boot block) will be
erased to FF(hex) by the chip erase operation if the boot block programming lockout feature is not
activated. The device will automatically return to normal read mode after the erase operation
completed. Data polling and/or Toggle Bits can be used to detect end of erase cycle.
Main Memory Erase Operation
The main memory erase mode can be initiated by a six-word command sequence. After the command
loading cycle, the device enters the internal main-memory erase mode, which is automatically timed
and will be completed in a fast 100 mS (typical). The host system is not required to provide any control
or timing during this operation. The device will automatically return to normal read mode after the erase
operation completed. Data polling and/or Toggle Bits can be used to detect end of erase cycle.
W49F102
- 4 -
Program Operation
The W49F102 is programmed on a word-by-word basis. Program operation can only change logical
data "1" to logical data "0" The erase operation (changed entire data in main memory and/or boot block
from "0" to "1" is needed before programming.
The program operation is initiated by a 4-word command cycle (see Command Codes for Word
Programming). The device will internally enter the program operation immediately after the word-
program command is entered. The internal program timer will automatically time-out (50
S max. -
T
BP
) once completed and return to normal read mode. Data polling and/or Toggle Bits can be used to
detect end of program cycle.
Hardware Data Protection
The integrity of the data stored in the W49F102 is also hardware protected in the following ways:
(1) Noise/Glitch Protection: A #WE pulse of less than 15 nS in duration will not initiate a write cycle.
(2) V
DD
Power Up/Down Detection: The programming and read operation are inhibited when V
DD
is
less than 2.5V typical.
(3) Write Inhibit Mode: Forcing #OE low, #CE high, or #WE high will inhibit the write operation. This
prevents inadvertent writes during power-up or power-down periods.
(4) V
DD
power-on delay: When V
DD
has reached its sense level, the device will automatically time-out
5 mS before any write (erase/program) operation.
Data Polling (DQ
7 &
DQ
15
)- Write Status Detection
The W49F102 includes a data polling feature to indicate the end of a program or erase cycle.
When the W49F102 is in the internal program or erase cycle, any attempt to read DQ
7
or DQ
15
of the
last word loaded will receive the complement of the true data. Once the program or erase cycle is
completed, DQ
7
or DQ
15
will show the true data. Note that DQ
7
or DQ
15
will show logical "0" during the
erase cycle, and become logical "1" or true data when the erase cycle has been completed.
Toggle Bit (DQ
6
& DQ
14
)- Write Status Detection
In addition to data polling, the W49F102 provides another method for determining the end of a
program cycle. During the internal program or erase cycle, any consecutive attempts to read DQ
6
or
DQ
14
will produce alternating 0's and 1's. When the program or erase cycle is completed, this toggling
between 0's and 1's will stop. The device is then ready for the next operation.
Product Identification
The product ID operation outputs the manufacturer code and device code. Programming equipment
automatically matches the device with its proper erase and programming algorithms.
The manufacturer and device codes can be accessed by software or hardware operation. In the
software access mode, a six-word (or JEDEC 3-word) command sequence can be used to access the
product ID. A read from address 0000H outputs the manufacturer code (00DAh). A read from address
0001H outputs the device code (002Fh). The product ID operation can be terminated by a three-word
command sequence or an alternate one-word command sequence (see Command Definition table).
In the hardware access mode, access to the product ID is activated by forcing #CE and #OE low, #WE
high, and raising A9 to 12 volts.
W49F102
Publication Release Date: February 19, 2002
- 5 - Revision A4
TABLE OF OPERATING MODES
Operating Mode Selection
(V
HH
= 12V
5%)
MODE
PINS
#CE #OE #WE
ADDRESS
DQ.
Read
V
IL
V
IL
V
IH
A
IN
Dout
Write
V
IL
V
IH
V
IL
A
IN
Din
Standby
V
IH
X
X X
High Z
Write Inhibit
X
V
IL
X X
High Z/D
OUT
X
X
V
IH
X
High Z/D
OUT
Output Disable
X
V
IH
X X
High Z
Product ID
V
IL
V
IL
V
IH
A0 = V
IL
; A1
-
A15 = V
IL
;
A9 = V
HH
Manufacturer Code 00DA
(Hex)
V
IL
V
IL
V
IH
A0 = V
IH
; A1
-
A15 = V
IL
;
A9 = V
HH
Device Code
002F (Hex)
TABLE OF COMMAND DEFINITION
COMMAND
No. of
1st Cycle
2nd Cycle
3rd Cycle
4th Cycle
5th Cycle
6th Cycle
DESCRIPTION
Cycles
Addr. Data
Addr. Data
Addr. Data
Addr. Data
Addr. Data Addr. Data
Read
1
A
IN
D
OUT
Chip Erase
6
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 10
Main Memory Erase
6
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 30
Word Program
4
5555 AA 2AAA 55 5555 A0 A
IN
D
IN
Boot Block Lockout
6
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 40
Product ID Entry
3
5555 AA 2AAA 55 5555 90
Product ID Exit
(1)
3
5555 AA 2AAA 55 5555 F0
Product ID Exit
(1)
1
XXXX F0
Note: Address Format: A14
-
A0 (Hex); Data Format: DQ15
-
DQ8 (Don't Care); DQ7
-
DQ0 (Hex)
Either one of the two Product ID Exit commands can be used.
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