SST25VF020 View Datasheet(PDF) - Silicon Storage Technology
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SST25VF020 Datasheet PDF : 23 Pages
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Data Sheet
Auto Address Increment (AAI) Program
The AAI program instruction allows multiple bytes of data to
be programmed without re-issuing the next sequential
address location. This feature decreases total program-
ming time when the entire memory array is to be pro-
grammed. An AAI program instruction pointing to a
protected memory area will be ignored. The selected
address range must be in the erased state (FFH) when ini-
tiating an AAI program instruction.
Prior to any write operation, the Write-Enable (WREN)
instruction must be executed. The AAI program instruction
is initiated by executing an 8-bit command, AFH, followed
by address bits [A23-A0]. Following the addresses, the data
is input sequentially from MSB (bit 7) to LSB (bit 0). CE#
must be driven high before the AAI program instruction is
executed. The user must poll the BUSY bit in the software
2 Mbit SPI Serial Flash
SST25VF020
status register or wait TBP for the completion of each inter-
nal self-timed Byte-Program cycle. Once the device com-
pletes programming byte, the next sequential address may
be program, enter the 8-bit command, AFH, followed by the
data to be programmed. When the last desired byte had
been programmed, execute the Write-Disable (WRDI)
instruction, 04H, to terminate AAI. After execution of the
WRDI command, the user must poll the Status register to
ensure the device completes programming. See Figure 7
for AAI programming sequence.
There is no wrap mode during AAI programming; once the
highest unprotected memory address is reached, the
device will exit AAI operation and reset the Write-Enable-
Latch bit (WEL = 0).
TBP
TBP
CE#
MODE 3 0 1 2 3 4 5 6 7 8 15 16 23 24 31 32 33 34 35 36 37 38 39
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
01
SCK MODE 0
SI
AF
A[23:16] A[15:8] A[7:0]
Data Byte 1
AF
Data Byte 2
TBP
CE#
SCK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
01234567
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SI
AF
Last Data Byte
04
05
Write Disable (WRDI)
Read Status Register (RDSR)
Instruction to terminate Instruction to verify end of
AAI Operation
AAI Operation
SO
DOUT
FIGURE 7: Auto Address Increment (AAI) Program Sequence
1231 F06.1
©2006 Silicon Storage Technology, Inc.
10
S71231-07-000
10/06
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