AS29F040 datasheet(3/18 Pages) ALSC

3 / 18 page

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L = Low (<VIL); H = High (>VIH); VID = 12.0 ± 0.5V; X = don’t car .

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Mode

DQ0-DQ7

ID read MFR code

VID

Code

ID read device code

VID

Code

Read

A0A1A6A9DOUT

Standby

XXX

High Z

Output disable

High Z

Write

DIN

Enable sector protect

VID

Pulse/L

VID

Sector unprotect

VID

Pulse/L

HHVID

Verify sector protect

VID

Code

Item

Description

ID MFR code,

device code

Selected by A9 = VID(11.5–12.5V), CE = OE = A1 = A6 = L, enabling outputs.

When A0 is low (VIL) the output data = 52h, a unique Mfr. code for Alliance Semiconductor Flash products.

When A0 is high (VIH), DOUT represents the device code for the AS29F040.

Read mode

Selected with CE = OE = L, WE = H. Data is valid in tACC time after addresses are stable, tCE after CE is low

and tOE after OE is low.

Standby

Selected with CE = H. Part is powered down, and ICC reduced to <1.0 mA for TTL input levels and <100 µA

for CMOS levels. If activated during an automated on-chip algorithm, the device completes the operation

before entering standby.

Output disable Part remains powered up; but outputs disabled with OE pulled high.

Write

Selected with CE = WE = L, OE = H. Accomplish all Flash erasure and programming through the command

on the falling edge of WE or CE, whichever occurs late . Data latching occurs on the rising edge WE or CE,

whichever occurs first. Filters on WE prevent spurious noise events from appearing as write commands.

Enable

sector protect

Hardware protection circuitry implemented with external programming equipment causes the device to

disable program and erase operations for specified sectors.

Sector

unprotect

Disables sector protection for all sectors using external programming equipment. All sectors must be

protected prior to sector unprotection.

Verify

sector protect

Verifies write protection for sector. Sectors are protected from program/erase operations on commercial

programming equipment. Determine if sector protection exists in a system by writing the ID read command

sequence and reading location XXX02h, where address bits A16–18 select the defined sector addresses.

A logical 1 on DQ0 indicates a protected sector; a logical 0 indicates an unprotected sector.

AS29F040 数据表(PDF) 3 Page - Alliance Semiconductor Corporation

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