w49v002fa Winbond Electronics Corp America, w49v002fa Datasheet - Page 5

• Manufacturer Part Number: w49v002fa
• Description: 256k X 8 Cmos Flash Memory With Fwh Interface
• Manufacturer: Winbond Electronics Corp America

Toggle Bit (DQ
In addition to data polling, the W49V002FA 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.
General Purpose Inputs Register
This register reads the FGPI[4:0] pins on the W49V002FA.This is a pass-through register which can
read via memory address FFBC0100(hex). Since it is pass-through register, there is no default value.
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 operation. In the software access
mode, a six-byte (or JEDEC 3-byte) command sequence can be used to access the product ID for
programmer interface mode. A read from address 0000(hex) outputs the manufacturer code, DA(hex).
A read from address 0001(hex) outputs the device code, 32(hex).” The product ID operation can be
terminated by a three-byte command sequence or an alternate one-byte command sequence (see
Command Definition table).
As for FWH interface mode, a read from FFBC, 0000(hex) can output the manufacturer code,
DA(hex). A read from FFBC, 0001(hex) can output the device code 32(hex).
TABLE OF OPERATING MODES
Operating Mode Selection - Programmer Mode
(V
Read
Write
Standby
Write Inhibit
Output Disable
HH
= 12V
7
BIT
4
3
2
1
0
5
MODE
5 )
Reserved
Read FGPI4 pin status
Read FGPI3 pin status
Read FGPI2 pin status
Read FGPI1 pin status
Read FGPI0 pin status
6
)- Write Status Detection
FUNCTION
#OE
V
V
V
V
X
X
IH
IH
IL
IL
#WE
V
V
V
X
X
X
IH
IH
IL
#RESET
V
V
V
V
V
V
- 5 -
IH
IH
IH
IH
IH
IL
ADDRESS
Publication Release Date: February 19, 2002
AIN
AIN
X
X
X
X
PINS
Dout
Din
High Z
High Z/DOUT
High Z/DOUT
High Z
W49V002FA
DQ.
Revision A2
6
will