MT28F320J3 Micron, MT28F320J3 Datasheet - Page 35

• Manufacturer Part Number: MT28F320J3
• Description: Q-FLASHTM MEMORY
• Manufacturer: Micron

128Mb, 64Mb, 32Mb Q-Flash Memory
MT28F640J3_7.p65 – Rev. 6, Pub. 8/02
PROTECTION REGISTER PROGRAMMING
FULL STATUS CHECK PROCEDURE
Write Protect Register
Read Status Register
(Protection Register
Data (see above)
Check if Desired
Program Setup)
Address/Data
Read Status
Full Status
SR3, SR4 =
PROGRAM
PROGRAM
SR1, SR4 =
SR1, SR4 =
Write C0h
Successful
Complete
Register
SR7 = 1
Start
Yes
Flowchart
Figure 11
1, 1
0, 1
1, 1
No
PROTECTION REGISTER
Attempted Program to
PROGRAMMING Error
Locked Register –
V
PEN
Aborted
Range Error
35
BUS
OPERATION COMMAND
WRITE
WRITE
READ
STANDBY
BUS
OPERATION COMMAND
STANDBY
STANDBY
STANDBY
PROTECTION PROGRAM operations can only be addressed
within the protection register address space. Addresses
outside the defined space will return an error.
Repeat for subsequent programming operations.
SR full status check can be done after each program or after
a sequence of program operations.
Write FFh after the last program operation to reset device
to read array mode.
SR3, if set during a program attempt, MUST be cleared
before further attempts are allowed by the ISM.
SR1, SR3, and SR4 are only cleared by the CLEAR STAUS
REGISTER command, in cases of multiple protection register
program operations, before full status is checked.
If an error is detected, clear the status register before
attempting retry or other error recovery.
Micron Technology, Inc., reserves the right to change products or specifications without notice.
PROTECTION
PROGRAM
SETUP
PROTECTION
PROGRAM
128Mb, 64Mb, 32Mb
Q-FLASH MEMORY
COMMENTS
Data = C0h
Data = Data to Program
Addr = Location to
Status Register Data
Toggle CE# or OE# to
update status register data
Check SR7
1 = ISM Ready
0 = ISM Busy
COMMENTS
SR1 SR3 SR4
0
0
1
1
0
0
Program
1
1
1
©2002, Micron Technology, Inc.
V
Protection
Register
Program
Error
Register
Locked:
Aborted
PEN
LOW