W49F002 Winbond, W49F002 Datasheet - Page 5

• Manufacturer Part Number: W49F002
• Description: 256K X 8 CMOS FLASH MEMORY
• Manufacturer: Winbond

Toggle Bit (DQ
In addition to data polling, the W49F002U provides another method for determining the end of a
program cycle. During the internal program or erase cycle, any consecutive attempts to read DQ
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 three-byte (or JEDEC 3-byte) command sequence can be used to access
the product ID. A read from address 0000H outputs the manufacturer code DA(hex). A read from
address 0001H outputs the device code 0B(hex). The product ID operation can be terminated by a
three-byte command code sequence or an alternate one-byte command code 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.
TABLE OF OPERATING MODES
Operating Mode Selection
(V
Read
Write
Standby
Write Inhibit
Output Disable
Reset Mode
Product ID
HH
= 12V
MODE
5 )
6
)- Write Status Detection
RESET
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IH
IH
IH
IL
CE
V
V
V
V
V
X
X
X
X
IH
IL
IL
IL
IL
OE
V
V
V
V
V
V
X
X
X
IH
IH
IL
IL
IL
IL
WE
V
V
V
V
V
X
X
X
X
IH
IH
IH
IH
IL
A
A
X
X
X
X
X
A0 = V
A9 = V
A0 = V
A9 = V
IN
IN
- 5 -
IL
HH
IH
HH
ADDRESS
; A1 A17 = V
; A1 A17 = V
PINS
Publication Release Date: April 2000
IL
IL
;
;
Dout
Din
High Z
High Z/DOUT
High Z/DOUT
High Z
High Z
Manufacturer Code DA (Hex)
Device Code 0B (Hex)
W49F002U
DQ.
Revision A2
6
will