W19B320ATB Datasheet, PDF (34/53 Pages) Winbond – 4M × 8/2M × 16 BITS 3V FLEXIBLE BANK FLASH MEMORY

W19B320AT/B
7.10 Erase Algorithm
START
Write Program
Command Sequence
(Note1,2)
Data Poll to Erasing
Bank from System
No
Embedded
Erase
algorithm
in progress
Data=FFh?
Yes
Erase Completed
Notes:
1. See Command Definitions Table for erase command sequence details.
2. See DQ3 section for the sector erase timer details.
7.11 Data Polling Algorithm
START
Read DQ7-DQ0
Addr=VA
Yes
DQ7=Data?
No
No
DQ5=1?
Yes
Read DQ7-DQ0
Addr=VA
DQ7=Data?
No
FAIL
Yes
PASS
Notes:
1. VA = Valid address for programming. During a sector erase operation; a valid address is any sector address within the
sector being erased. During chip erase, a valid address is any non-protected sector address.
2. DQ7 should be rechecked even if DQ5 = “1” because DQ7 may change simultaneously with DQ5.
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