AM29F200AT-70SCB View Datasheet(PDF) - Advanced Micro Devices
Part Name
Description
MFG CO.
AM29F200AT-70SCB
Advanced Micro Devices
'AM29F200AT-70SCB' PDF : 39 Pages View PDF
PRELIMINARY
if the system can guarantee that the time between ad-
ditional sector erase commands will always be less
than 50 µs. See also the “Sector Erase Command Se-
quence” section.
After the sector erase command sequence is written,
the system should read the status on DQ7 (Data# Poll-
ing) or DQ6 (Toggle Bit I) to ensure the device has ac-
cepted the command sequence, and then read DQ3. If
DQ3 is “1”, the internally controlled erase cycle has be-
gun; all further commands (other than Erase Suspend)
are ignored until the erase operation is complete. If
DQ3 is “0”, the device will accept additional sector
erase commands. To ensure the command has been
accepted, the system software should check the status
of DQ3 prior to and following each subsequent sector
erase command. If DQ3 is high on the second status
check, the last command might not have been ac-
cepted. Table 9 shows the outputs for DQ3.
START
Read DQ7–DQ0
Read DQ7–DQ0 (Note 1)
Toggle Bit
No
= Toggle?
Yes
No
DQ5 = 1?
Yes
Read DQ7–DQ0 (Notes
Twice
1, 2)
Toggle Bit
No
= Toggle?
Yes
Program/Erase
Operation Not
Complete, Write
Reset Command
Program/Erase
Operation Complete
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.
20637B-10
Figure 5. Toggle Bit Algorithm
Am29F200A
19
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