W29C020C 查看數據表（PDF） - Winbond

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W29C020C

256K X 8 CMOS FLASH MEMORY

Winbond 

W29C020C

Toggle Bit (DQ6)- Write Status Detection

In addition to data polling, the W29C020C provides another method for determining the end of a write

cycle. During the internal write cycle, any consecutive attempts to read DQ6 will produce alternating 0's

and 1's. When the write cycle is completed, this toggling between 0's and 1's will stop. The device is

then ready for the next operation. See Toggle Bit Timing Diagram.

Product Identification

The product ID operation outputs the manufacturer code and device code. The programming

equipment automatically matches the device with its proper erase and programming algorithms.

The manufacturer and device codes can be accessed through software or by hardware operation. In

the software access mode, a six-byte command sequence can be used to access the product ID. A

read from address "00000 hex" outputs the manufacturer code "DA hex." A read from address "00001

hex" outputs the device code "45 hex." The product ID operation can be terminated by a three-byte

command sequence.

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.

Note: The hardware SID read function is not included in all parts; please refer to Ordering Information for details.

TABLE OF OPERATING MODES

Operating Mode Selection

Operating Range: 0 to 70° C (Ambient Temperature), VDD = 5V ±10%, VSS = 0V, VHH = 12V

MODE

PINS

Read

CE OE WE

VIL VIL VIH AIN

ADDRESS

DQ.

Dout

Write

VIL VIH VIL AIN

Din

Standby

VIH X X X

High Z

Write Inhibit

X VIL X X

High Z/DOUT

X X VIH X

High Z/DOUT

Output Disable

X VIH X X

High Z

5-Volt Software Chip

VIL VIH VIL AIN

DIN

Erase

Product ID

VIL VIL VIH A0 = VIL; A1−A17 = VIL; Manufacturer Code DA

A9 = VHH

(Hex)

VIL VIL VIH A0 = VIH; A1−A17 = VIL; Device Code

A9 = VHH

45 (Hex)

Publication Release Date: December 2000

-5-

Revision A3

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