S29AL004D datasheet(29/55 Pages) SPANSION

Part #	S29AL004D

Description	4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

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Manufacturer	SPANSION [SPANSION]

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February 18, 2005 S29AL004D_00_A1

S29AL004D

27

Ad vance

Info rmat i o n

RY/BY#: Ready/Busy#

The RY/BY# is a dedicated, open-drain output pin that indicates whether an Em-

bedded Algorithm is in progress or complete. The RY/BY# status is valid after the

rising edge of the final WE# pulse in the command sequence. Since RY/BY# is an

open-drain output, several RY/BY# pins can be tied together in parallel with a

pull-up resistor to VCC.

DQ7 = Data?

Yes

No

DQ5 = 1?

No

Yes

FAIL

PASS

Read DQ7–DQ0

Addr = VA

Read DQ7–DQ0

Addr = VA

DQ7 = Data?

START

Notes:

1. VA = Valid address for programming. During a sector

erase operation, a valid address is an address within

any sector selected for erasure. During chip erase, a

valid address is any non-protected sector address.

2. DQ7 should be rechecked even if DQ5 = 1 because

DQ7 may change simultaneously with DQ5.

Figure 5. Data# Polling Algorithm

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S29AL004D Datasheet(PDF) 29 Page - SPANSION

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