AMC0XXDFLKA Datasheet, PDF (31/46 Pages) Advanced Micro Devices – 4, 8, 20, or 32 Megabyte 5.0 Volt-only Flash Memory PC Card

EMBEDDED ALGORITHMS
Begin
Subroutine
Read Byte
(D0–D7)
D7 = 1?
No
Yes
D5 = 1?
No
Yes
Read Byte
(D0–D7)
Read Byte
(D8–D15)
D7 = 1?
No
Yes
Low byte program
time exceeded limit,
EF = 1
D15 = 1? ^No
Yes
D13 = 1?
No
Yes
Read Byte
(D8–D15)
D7/15 = 1
Yes = Erase complete
No = Erase not complete
D5/13 = 1
Yes = Erase time has exceeded limit, device failed
No = Erase time has not exceeded limit
Yes
D15 = 1?
No
High byte program
time exceeded limit,
EF = 2 + EF
Subroutine
Return
Figure 16. Word-Wide Software Polling Erase Subroutine
AmC0XXDFLKA
19521D-17
31