W49F201S-45B WINBOND [Winbond], W49F201S-45B Datasheet - Page 5

• Manufacturer Part Number: W49F201S-45B
• Description: 128K X 16 CMOS FLASH MEMORY
• Manufacturer: WINBOND [Winbond]

Toggle Bit (DQ
In addition to data polling, the W49F201 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 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, 00DA(hex). A read from
address 0001(hex) outputs the device code, 00AE(hex). The product ID operation can be terminated
by a three-word command sequence or an alternative 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.
TABLE OF OPERATING MODES
Operating Mode Selection
(V
Read
Erase/Program
Standby
Erase/Program
Inhibit
Output Disable
Product ID
Reset
HH
= 12V 5
MODE
)
6
)- Write Status Detection
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
RESET
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IH
IH
IH
IL
- 5 -
A
A
X
X
X
X
A0 = V
A1 A15 = V
A0 = V
A1 A15 = V
X
IN
IN
PINS
ADDRESS
IL
IH
;
;
Preliminary W49F201
IL
IL
; A9 = V
; A9 = V
Publication Release Date: June 1999
HH
HH
Dout
Din
High Z
High Z/D
High Z/D
High Z
Manufacturer Code
00DA (Hex)
Device Code
00AE (Hex)
High Z
DQ.
OUT
OUT
Revision A1
6
will