S29AL008D datasheet(31/55 Pages) SPANSION

Part #	S29AL008D

Description	8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

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Manufacturer	SPANSION [SPANSION]

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June 16, 2005 S29AL008D_00A3

S29AL008D

31

Da t a

S h ee t

sector erase commands is always less than 50 µs. See also the Sector Erase

Command Sequence, on page 23.

After the sector erase command sequence is written, the system should read the

status on DQ7 (Data# Polling) or DQ6 (Toggle Bit I) to ensure the device accepted

the command sequence, and then read DQ3. If DQ3 is 1, the internally controlled

erase cycle started; all further commands (other than Erase Suspend) are ig-

nored until the erase operation is complete. If DQ3 is 0, the device accepts

START

No

Yes

DQ5 = 1?

No

Yes

Toggle Bit

= Toggle?

No

Program/Erase

Operation Not

Complete, Write

Reset Command

Program/Erase

Operation Complete

Read DQ7–DQ0

Toggle Bit

= Toggle?

Read DQ7–DQ0

Twice

Read DQ7–DQ0

(Notes

1, 2)

Notes:

1. Read toggle bit twice to determine whether or not it

is toggling. See text.

2. Recheck toggle bit because it may stop toggling as

DQ5 changes to 1. See text.

Figure 6. Toggle Bit Algorithm

Note 1

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