SST25VF020B datasheet(21/33 Pages) SST

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Data Sheet

2 Mbit SPI Serial Flash

SST25VF020B

S71417-02-000

04/10

FIGURE 21: Enable-Write-Status-Register (EWSR) or

Write-Enable (WREN) and Write-Status-Register (WRSR) Word-Data Input Sequence

The WRSR instruction can either execute a byte-data or a

word-data input. Extra data/clock input, or within byte-/

word-data input, will not be executed. The reason for the

byte support is for backward compatibility to products

where WRSR instruction sequence is followed by only a

byte-data.

JEDEC Read-ID

The JEDEC Read-ID instruction identifies the device as

SST25VF020B and the manufacturer as SST. The device

information can be read from executing the 8-bit command,

9FH. Following the JEDEC Read-ID instruction, the 8-bit

manufacturer’s ID, BFH, is output from the device. After

that, a 16-bit device ID is shifted out on the SO pin. Byte 1,

BFH, identifies the manufacturer as SST. Byte 2, 25H, iden-

tifies the memory type as SPI Serial Flash. Byte 3, 8CH,

identifies the device as SST25VF020B. The instruction

sequence is shown in Figure 22. The JEDEC Read ID

instruction is terminated by a low to high transition on CE#

at any time during data output.

FIGURE 22: JEDEC Read-ID Sequence

1417 EWSR1.0

MODE 3

HIGH IMPEDANCE

MODE 0

STATUS

76 54 3 2 10

MSB

MODE 3

SCK

CE#

MODE 0

50 or 06

0 1 234 5 6 7

0 1 234 5 6 789 10 11 12 13 14 15

STATUS

76 54 3 2 10

MSB

16 17 18 19 20 21 22 23

1417 JEDECID.1

CE#

SCK

012345678

HIGH IMPEDANCE

15 16

28 29 30 31

MODE 3

MODE 0

MSB

9 10111213

1718

19 20 21 22 23 24 25 26 27

TABLE

7: JEDEC Read-ID Data

Device ID

Manufacturer’s ID

Memory Type

Memory Capacity

Byte1

Byte 2

Byte 3

BFH

25H

8CH

T7.0 1417

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