W28V400B Datasheet, PDF (19/48 Pages) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY

W28V400B/T
Start
Write 40H or 10H,
Address
Write Word/Byte
Data and Adddress
Read Status
Register
0
SR.7=
1
Full Status
Check if Desired
Word/Byte Write
Complete
No
Suspend
Word/Byte
Write
Suspend Word/Byte
Write Loop
Yes
Full STATUS CHECK PROCEDURE
Read Status Register
Data(See Above)
SR.3=
1
0
1
SR.1=
0
SR.4=
1
0
Word/Byte Write
Successfully
Vpp Range Error
Device Protect Error
Word/Byte Write Error
Bus Operation
Write
Write
Read
Command
Comments
Setup Data = 40H or 10H
Word/Byte Addr = Location to Be
Write
Written
Data = Data to Be
Word/Byte
Written
Write Addr = Location to Be
Written
Status Register Data
Standby
Check SR.7
1 = WSM Ready
0 = WSM Busy
Repeat for subsequent byte writes.
SR full status check can be done after each Word/Byte
write, or after a sequence of Word/Byte writes.
Write FFH after the last Word/Byte write operation to
place device in read array mode.
Bus Operation
Standby
Standby
Standby
Command
Comments
Check SR.3
1 = V_PP Error Detect
Check SR.1
1 = Device Protect
Detect
Check SR.4
1 = Data Write Error
SR.4, SR.3 and SR.1 are only cleared by the Clear
Status Register command in cases where multiple
locations are written before full status is checked.
If error is detected, clear the Status Register before
attempting retry or other error recovery.
Figure 6. Automated Word/Byte Write Flowchart
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Publication Release Date: April 11, 2003
Revision A4