SST25VF040 datasheet(9/23 Pages) SST

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EOL Product Data Sheet

2 Mbit / 4 Mbit SPI Serial Flash

SST25VF040

S71231(04)-00-000

10/06

Read

The Read instruction outputs the data starting from the

specified address location. The data output stream is con-

tinuous through all addresses until terminated by a low to

high transition on CE#. The internal address pointer will

automatically increment until the highest memory address

is reached. Once the highest memory address is reached,

the address pointer will automatically increment to the

beginning (wrap-around) of the address space, i.e. for

4 Mbit density, once the data from address location

7FFFFH had been read, the next output will be from

address location 00000H.

The Read instruction is initiated by executing an 8-bit com-

mand, 03H, followed by address bits [A23-A0]. CE# must

remain active low for the duration of the Read cycle. See

Figure 5 for the Read sequence.

FIGURE 5: READ SEQUENCE

Byte-Program

The Byte-Program instruction programs the bits in the

selected byte to the desired data. The selected byte must

be in the erased state (FFH) when initiating a Program

operation. A Byte-Program instruction applied to a pro-

tected memory area will be ignored.

Prior to any Write operation, the Write-Enable (WREN)

instruction must be executed. CE# must remain active low

for the duration of the Byte-Program instruction. The Byte-

Program instruction is initiated by executing an 8-bit com-

mand, 02H, followed by address bits [A23-A0]. Following the

address, the data is input in order from MSB (bit 7) to LSB

(bit 0). CE# must be driven high before the instruction is

executed. The user may poll the Busy bit in the software

status register or wait TBP for the completion of the internal

self-timed Byte-Program operation. See Figure 6 for the

Byte-Program sequence.

FIGURE 6: Byte-Program Sequence

1231 F04.1

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

HIGH IMPEDANCE

15 16

23 24

31 32

39 40

55 56

63 64

N+2

N+3

N+4

N+1

DOUT

MSB

MODE 0

MODE 3

DOUT

1231 F05.1

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

DIN

HIGH IMPEDANCE

15 16

23 24

31 32

MODE 0

MODE 3

MSB

LSB

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