AM29LV160M AMD [Advanced Micro Devices], AM29LV160M Datasheet - Page 39

• Manufacturer Part Number: AM29LV160M
• Description: 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) MirrorBit TM 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

January 31, 2007 25974B5
DQ5: Exceeded Timing Limits
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.
DQ5 indicates whether the program or erase time exceeded a specified internal
pulse count limit. Under these conditions DQ5 produces a “1.” This is a failure
condition that indicates the program or erase cycle was not successfully
completed.
The DQ5 failure condition may appear if the system tries to program a “1” to a
location that is previously programmed to “0.” Only an erase operation can
No
D a t a
Figure 8. Toggle Bit Algorithm
Complete, Write
Reset Command
Read DQ7–DQ0
Read DQ7–DQ0
Read DQ7–DQ0
Program/Erase
Operation Not
Toggle Bit
Toggle Bit
DQ5 = 1?
= Toggle?
= Toggle?
S h e e t
START
Twice
Am29LV160M
Yes
Yes
Yes
(Note 1)
(Notes
1, 2)
Operation Complete
No
No
Program/Erase
37