128Mb, 256Mb, 512Mb, 1Gb StrataFlash Memory
Program Operations
Program Operations
Programming the array changes 1s to 0s. To change 0s to 1s, an ERASE operation must
be performed. Only one PROGRAM operation can occur at a time. Programming is per-
mitted during erase suspend.
Information is programmed into the array by issuing the appropriate command.
All PROGRAM operations require the addressed block to be unlocked and a valid VPP
voltage applied throughout the PROGRAM operation. Otherwise, the PROGRAM opera-
tion will abort, setting the appropriate status register error bit(s).
If the device is deselected during a PROGRAM or ERASE operation, the device continues
to consume active power until the PROGRAM or ERASE operation has completed.
Table 21: PROGRAM Command Bus Cycles
Setup WRITE Cycle
Address Bus
Setup WRITE Cycle Confirm WRITE Cycle Confirm WRITE Cycle
Command
Data Bus
Address Bus
Data Bus
SINGLE-WORD
PROGRAM
Device address
0041h
Device address
Array data
BUFFERED PROGRAM
Device address
Device address
00E9h
0080h
Device address
Device address
00D0h
00D0h
BUFFERED ENHANCED
FACTORY PROGRAM
Single-Word Programming
Single-word programming is performed by issuing the SINGLE-WORD PROGRAM com-
mand. This is followed by writing the desired data at the desired address. The read
mode of the addressed partition is automatically changed to read status register mode,
which remains in effect until another READ MODE command is issued.
Issuing the READ STATUS REGISTER command to another partition switches that par-
tition’s read mode to read status register mode, thereby allowing programming progress
to be monitored from that partition’s address.
Single-Word Programming is supported in control mode only. The array address speci-
fied must be in the A-half of the programming region.
During programming, the status register indicates a busy status (SR[7] = 0). Upon com-
pletion, the status register indicates a ready status (SR[7] = 1). The status register should
be checked for any errors, then cleared.
The only valid commands during programming are READ ARRAY, READ ID, READ CFI,
and PROGRAM SUSPEND. After programming completes, any valid command can be
issued.
Issuing the READ ARRAY, READ ID, or READ CFI command to a partition that is actively
programming causes subsequent reads from that partition to output invalid data. Valid
data is output only after the PROGRAM operation is complete.
Standby power levels are not realized until the PROGRAM operation has completed. As-
serting RST# immediately aborts the PROGRAM operation, and array contents at the
addressed location are indeterminate. The addressed block should be erased and the
data reprogrammed.
PDF: 09005aef8448483a
128_256_512_65nm_g18.pdf - Rev. F 8/11 EN
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