AM29BDS640G datasheet(43/65 Pages) SPANSION

部件名	AM29BDS640G

功能描述	64 Megabit (4 M x 16-Bit) CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory

PDF	65 Pages

Scroll/Zoom	100%

制造商	SPANSION [SPANSION]

网页	http://www.spansion.com

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43 / 65 page

October 1, 2003 25903C1

Am29BDS640G

Prelimin ary

Note: The system should recheck the toggle bit even if DQ5 = “1” because the toggle

bit may stop toggling as DQ5 changes to “1.” See the subsections on DQ6 and DQ2

for more information.

Figure 5. Toggle Bit Algorithm

DQ2: Toggle Bit II

The “Toggle Bit II” on DQ2, when used with DQ6, indicates whether a particular

sector is actively erasing (that is, the Embedded Erase algorithm is in progress),

or whether that sector is erase-suspended. Toggle Bit II is valid after the rising

edge of the final WE# pulse in the command sequence.

DQ2 toggles when the system reads at addresses within those sectors that have

been selected for erasure. But DQ2 cannot distinguish whether the sector is ac-

tively erasing or is erase-suspended. DQ6, by comparison, indicates whether the

device is actively erasing, or is in Erase Suspend, but cannot distinguish which

START

Yes

DQ5 = 1?

Yes

Toggle Bit

= Toggle?

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

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