Numonyx® Embedded Flash Memory (J3 65 nm) Single Bit per Cell (SBC)
Figure 22: Set Block Lock-Bit Flowchart
Start
Bus
Operation
Command
Comments
Set Block Lock-Bit Data = 60H
Write 60H,
Block Address
Write
Setup
Addr =Block Address
Set Block Lock-Bit Data = 01H
Write
Read
Confirm
Addr = Block Address
Write 01H,
Block Address
Status Register Data
Check SR.7
1 = WSM Ready
0 = WSM Busy
Read Status Register
Standby
Repeat for subsequent lock-bit operations.
0
SR.7 =
1
Full status check can be done after each lock-bit set operation or after
a sequence of lock-bit set operations.
Write FFH after the last lock-bit set operation to place device in read
array mode.
Full Status
Check if Desired
Set Lock-Bit Complete
FULL STATUS CHECK PROCEDURE
Read Status Register
Data (See Above)
Bus
Operation
Command
Comments
Check SR.3
1 = Programming Voltage Error
Detect
1
Standby
SR.3 =
Voltage Range Error
Check SR.4, 5
Standby
Standby
Both 1 = Command Sequence
Error
0
SR.4,5 =
0
1
1
Command Sequence
Error
Check SR.4
1 = Set Lock-Bit Error
SR.5, SR.4 and SR.3 are only cleared by the Clear Status Register
command, in cases where multiple lock-bits are set before full status is
checked.
SR.4 =
0
Set Lock-Bit Error
If an error is detected, clear the status register before attempting retry
or other error recovery.
Set Lock-Bit
Successful
Datasheet
54
Jan 2011
208032-03
MICRON [ MICRON TECHNOLOGY ]
