MFM8126S-70/90/12
ISSUE4.2:November1998
Toggle Bit Algorithm
Start
VA = Byte Address for programming
= Any of the sector addresses
within the sector being erased
during sector erase operation.
= XXXXH during chip erase
Read Byte
(D0 - D7)
Addr=VA
No
D6 = Toggle?
Yes
No
D5=1?
Yes
Read Byte
(D0 - D7)
Addr=VA
No
D6 = Toggle?
Pass
Yes
Fail
Note : D6 is rechecked even if D5 = "1" beceause D6 may stop toggling at the same time
as D5 changing to "1"
21