128Mb, 256Mb, 512Mb, 1Gb StrataFlash Memory
BLANK CHECK Operation
BLANK CHECK Operation
Blank check verifies whether a main-array block is completely erased. A BLANK CHECK
operation is performed one block at a time, and cannot be used during program sus-
pend or erase suspend.
To use blank check, first issue the BLANK CHECK SETUP command followed by the
CONFIRM command. The read mode of the addressed partition is automatically
changed to read status register mode, which remains in effect until another read mode
is issued.
During a BLANK CHECK operation, the status register indicates a busy status (SR[7] =
0). Upon completion, the status register indicates a ready status (SR[7] = 1). Issuing the
READ STATUS REGISTER command to another partition switches that partition’s read
mode to read status register mode, thereby allowing the BLANK CHECK operation to be
monitored from that partition’s address.
The status register should be checked for any errors, and then cleared. If theBLANK
CHECK operation fails (the block is not completely erased), then the status register will
indicate a blank check error (SR[7:5] = 1).
The only valid command during a BLANK CHECK operation is read status. Blank check
cannot be suspended. After the BLANK CHECK operation has completed, any valid
command can be issued.
Table 26: BLANK CHECK Command Bus Cycles
Setup WRITE Cycle
Address Bus
Setup WRITE Cycle
Data Bus
Confirm WRITE Cycle
Address Bus
Confirm WRITE Cycle
Data Bus
Command
BLANK
CHECK
Block address
00BCh
Block address
00D0h
PDF: 09005aef8448483a
128_256_512_65nm_g18.pdf - Rev. F 8/11 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
45
© 2011 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
