MT28S4M16B1LL Datasheet, PDF (41/58 Pages) Micron Technology – SYNCFLASH MEMORY

BLOCK PROTECT SEQUENCE¹
Start
FCS Command
Sequence^{2, 3}
Read Status Register
NO
SR7 = 1
YES
Complete Status
Check
DEVICE PROTECT Complete^{4, 5}
ADVANCE
64Mb: x16, x32
SYNCFLASH MEMORY
COMPLETE BLOCK PROTECT
STATUS-CHECK SEQUENCE
Start (BLOCK PROTECT completed)
SR4 = 1?
NO
YES _{BLOCK or DEVICE}
PROTECT Error⁶
SR4, SR5 = 1? ^YES _{Command Sequence Error} ⁶
NO
SR3 = 1?
NO
YES Invalid BLOCK/DEVICE
PROTECT Error ⁶
BLOCK PROTECT Successful
NOTE:
1. Sequence may be repeated for multiple BLOCK PROTECTs.
2. FCS includes HCS and SCS.
3. RP# can be brought to VHH before the last command in the block protect sequence is issued.
4. Complete status check is not required.
5. The bank will be in array read mode.
6. SR3–SR5 must be cleared using CLEAR STATUS REGISTER.
64Mb: x16, x32 SyncFlash
MT28S4M16B1LL.p65 – Rev. 1, Pub. 5/02
41
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©2002, Micron Technology, Inc.