Intel
£
Advanced+ Boot Block Flash Memory (C3)
Datasheet 57
Figure 18. Protection Register Programming Flowchart
FULL STATUS CHECK PROCEDURE
Program Pr otecti on Register operation addresses m ust be
wi thin the Protection Register address space. Addresses
outside this space will return an error.
Repeat for subsequent pr ogramm i ng operations.
Full Status Register check can be done after each pr ogram, or
after a sequence of program operations.
Write 0xFF after the last operation to set Read Ar ray state.
SR[3] must be cleared befor e the Write State Machine wi ll
allow further program attempts.
Only the Clear Staus Register comm and clears SR[1, 3, 4].
If an er ror is detected, clear the Status register before
attempting a program retry or other error recover y.
1
0
1
1
PROTECTION REGISTER PROGRAMMING PROCEDURE
Start
Wri te 0xC0,
PR Address
Wri te PR
Address & Data
Read Status
Register
SR[7] =
Full Status
Check
(i f desired)
Program
Complete
Read Status
Register Data
Program
Successful
SR[3], SR[4] = V
PP
Range Error
Program Er ror
Register Locked;
Program Aborted
Idle
Idle
Bus
Operation
None
None
Command
Check SR[1], SR[3], SR[4]:
0,1,1 = V
PP
Range Er r or
Check SR[1], SR[3], SR[4]:
0,0,1 = Programm ing Err or
Comments
Wr i te
Wr i te
Idle
Program
PR Setup
Protection
Program
None
Data = 0xC0
Addr = Fir st Locati on to Pr ogr am
Data = Data to Pr ogram
Addr = Location to Pr ogram
Check SR[7]:
1 = WSM Ready
0=WSMBusy
Bus
Operation
Command Comments
Read None
Status Register Data. Toggle CE# or
OE# to Update Status Register Data
Idle None
Check SR[1], SR[3], SR[4]:
1,0,1 = Block locked; operati on aborted
(Program Setup)
(Confirm Data)
0
0
SR[3], SR[4] =
0
SR[3], SR[4] =
1
