SST25WF080 datasheet(10/29 Pages) SST

10 / 29 page

Advance Information

8Mbit 1.8V SPI Serial Flash

SST25WF080

S71203-03-000

04/10

Read (33 MHz)

The Read instruction, 03H, supports up to 33 MHz Read.

The device outputs a data stream starting from the speci-

fied address location. The data stream is continuous

through all addresses until terminated by a low-to-high tran-

sition on CE#. The internal address pointer automatically

increments until the highest memory address is reached.

Once the highest memory address is reached, the address

pointer automatically increments to the beginning (wrap-

around) of the address space. For example, for 8 Mbit den-

sity, once the data from the address location FFFFFH is

read, the next output is from address location 000000H.

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 7 for the Read sequence.

FIGURE 7: Read Sequence

High-Speed-Read (75 MHz)

The High-Speed-Read instruction supporting up to 75 MHz

Read is initiated by executing an 8-bit command, 0BH, fol-

lowed by address bits [A23-A0] and a dummy byte. CE#

must remain active low for the duration of the High-Speed-

Read cycle. See Figure 8 for the High-Speed-Read

sequence.

Following a dummy cycle, the High-Speed-Read instruc-

tion outputs the data starting from the specified address

location. The data output stream is continuous through all

addresses until terminated by a low-to-high transition on

CE#. The internal address pointer will automatically incre-

ment 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. For example, for 2 Mbit den-

sity, once the data from address location 7FFFFH is read,

the next output will be from address location 000000H.

FIGURE 8: High-Speed-Read Sequence

1203 F06.0

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

1203 F07.0

CE#

SCK

ADD.

012 3 4 5

6 7 8

ADD.

HIGH IMPEDANCE

15 16

23 24

31 32

39 40

47 48

55 56

63 64

N+2

N+3

N+4

N+1

MSB

MODE 0

MODE 3

DOUT

71 72

DOUT

MSB

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