at49bv320ct ATMEL Corporation, at49bv320ct Datasheet - Page 13

• Manufacturer Part Number: at49bv320ct
• Description: 32-megabit 2m X 16 3-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

15. Full Erase Status Check Flowchart
13. Sector Erase Flowchart
3372F–FLASH–4/05
Sector
Sector
Sector
Status Check
Read Status
(If Desired)
Write 20,
Full Erase
Write D0,
Complete
Register
SR7 =
Start
Sector
Address
Address
Erase
Read Status
Successful
1
SR4, SR5
Register
SR5 =
SR1 =
SR3 =
Erase
0
0
0
0
=
(Erase Confirm)
0
(
Sector
1
1,1
1
1
Erase)
Suspend
Erase
Sequence Error
Sector
Sector
V
Command
No
P P
Error
Error
Error
Range
Locked
Erase
Yes
Suspend
Erase
Loop
14. Sector Erase Procedure
16. Full Erase Status Check Procedure
Repeat for subsequent sector erasures.
Full status register check can be done after each sector erase,
or after a sequence of sector erasures.
Write FF after the last operation to enter read mode.
Operation
SR1, SR3 must be cleared before the Write State Machine
allows further erase attempts.
Only the Clear Status Register command clears SR1, SR3,
SR4, SR5.
If an error is detected, clear the status register before
attempting an erase retry or other error recovery.
Operation
Write
Write
Read
Bus
Bus
Idle
Idle
Idle
Idle
Idle
Command
Command
Confirm
Sector
Erase
Setup
Erase
None
None
None
None
None
None
Comments
Data = 20
Addr = Sector to be erased (SA)
Data = D0
Addr = Sector to be erased (SA)
Status register data: Toggle CE
or
OE to update status register data
Check SR7
1 = WSM Ready
0 = WSM Busy
Comments
Check SR3:
1 = V
Check SR4, SR5:
Both 1 = Command Sequence
Error
Check SR5:
1 = Sector Erase Error
Check SR1:
1 = Attempted erase of locked
sector; erase aborted.
AT49BV320C(T)
PP
Range Error
13