May 11, 2006 S29WS-J_00_A6 S29WS128J/064J 65
Data Sheet
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 8. 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 actively erasing or is erase-sus
-
pended. DQ6, by comparison, indicates whether the device is actively erasing, or is in Erase
START
No
Yes
Yes
DQ5 = 1?
No
Yes
DQ6 = Toggle?
No
Read Byte
(DQ0-DQ7)
Address = VA
DQ6 = Toggle?
Read Byte Twice
(DQ 0-DQ7)
Adrdess = VA
Read Byte
(DQ0-DQ7)
Address = VA
FAIL PASS
