256-Mbit J3 (x8/x16)
Figure 26. Protection Register Programming Flowchart
Start
Bus Operation
Command
Comments
Protection Program
Setup
Write
Write
Data = C0H
Write C0H
(Protection Reg.
Program Setup)
Data = Data to Program
Addr = Location to Program
Protection Program
Status Register Data Toggle
CE# or OE# to Update Status
Register Data
Write Protect. Register
Address/Data
Read
Check SR.7
Standby
1 = WSM Ready
0 = WSM Busy
Read Status Register
Protection Program operations can only be addressed within the protection
register address space. Addresses outside the defined space will return an
error.
No
SR.7 = 1?
Yes
Repeat for subsequent programming operations.
SR Full Status Check can be done after each program or after a sequence of
program operations.
Full Status
Check if Desired
Write FFH after the last program operation to reset device to read array mode.
Program Complete
FULL STATUS CHECK PROCEDURE
Bus Operation
Standby
Command
Comments
SR.1 SR.3 SR.4
Read Status Register
Data (See Above)
0
1
1
V PEN Low
1, 1
0
0
1
Prot. Reg.
Prog. Error
Standby
SR.3, SR.4 =
SR.1, SR.4 =
VPEN Range Error
1
0
1
Register
Locked:
Aborted
0,1
1,1
Standby
Protection Register
Programming Error
SR.3 MUST be cleared, if set during a program attempt, before further
attempts are allowed by the Write State Machine.
Attempted Program to
Locked Register -
Aborted
SR.1, SR.3 and SR.4 are only cleared by the Clear Staus Register Command,
in cases of multiple protection register program operations before full status is
checked.
SR.1, SR.4 =
If an error is detected, clear the status register before attempting retry or other
error recovery.
Program Successful
Datasheet
67
INTEL [ INTEL ]
