L160DB70VC datasheet(29/52 Pages) AMD

29 / 52 page

22358B7 May 5, 2006

Am29LV160D

DA TA

SH EET

toggling, the device has successfully completed the

program or erase operation. If it is still toggling, the de-

vice did not complete the operation successfully, and

the system must write the reset command to return to

reading array data.

The remaining scenario is that the system initially de-

termines that the toggle bit is toggling and DQ5 has

not gone high. The system may continue to monitor

the toggle bit and DQ5 through successive read cy-

cles, determining the status as described in the

previous paragraph. Alternatively, it may choose to

perform other system tasks. In this case, the system

must start at the beginning of the algorithm when it re-

turns to determine the status of the operation (top of

Figure 6).

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

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)

(Notes

1, 2)

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