AS29F200 datasheet(4/20 Pages) ALSC

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Key: L =Low (<VIL); H = High (>VIH); X =Don’t care; T = top; B = botto

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 AS29F200.

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 <2.0 mA for TTL input 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 A12–16 select the defined sector addresses. A

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

Temporary

sector

unprotect

Temporarily disables sector protection for in-system data changes to protected sectors. Apply +12V to RESET

to activate sector unprotect mode. During temporary sector unprotect mode, program protected sectors by

selecting the appropriate sector address. All protected sectors revert to protected state on removal of +12V

from RESET.

RESET

Resets the write and erase state machine to read mode. If device is programming or erasing when

RESET = L, data may be corrupted.

Deep

power down

Hold RESET low to enter deep power down mode (<10 µA CMOS). Recovery time to active mode is 1.5 µs.

Mode

A16–A12

Code

MFR code (Alliance Semiconductor)

52h

Device code

×8 T boot

LLH

51h

×8 B boot

LLH

57h

×16 T boot

2251h

×16 B boot

2257h

Sector protection

Sector address

01h protected

00h unprotected

AS29F200 数据表(PDF) 4 Page - Alliance Semiconductor Corporation

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