SST25PF040B datasheet(16/31 Pages) MICROCHIP

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SST25PF040B

DS20005134B-page 16

 2014 Microchip Technology Inc.

4.4.15

JEDEC READ-ID

The JEDEC Read-ID instruction identifies the device as

SST25PF040B and the manufacturer as Microchip.

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 manufac-

turer as Microchip. Byte 2, 25H, identifies the memory

type as SPI Serial Flash. Byte 3, 8DH, identifies the

device as SST25PF040B. The instruction sequence is

shown in Figure 4-18. The JEDEC Read ID instruction

is terminated by a low to high transition on CE# at any

time during data output.

FIGURE 4-18:

JEDEC READ-ID SEQUENCE

4.4.16

READ-ID (RDID)

The Read-ID instruction (RDID) identifies the devices

as SST25PF040B and manufacturer as Microchip. This

command is backward compatible to all SST25xFxxxA

devices and should be used as default device identifi-

cation when multiple versions of SPI Serial Flash

devices are used in a design. The device information

can be read from executing an 8-bit command, 90H or

ABH, followed by address bits [A23-A0]. Following the

Read-ID instruction, the manufacturer’s ID is located in

address 00000H and the device ID is located in

address 00001H. Once the device is in Read-ID mode,

the manufacturer’s and device ID output data toggles

between address 00000H and 00001H until terminated

by a low to high transition on CE#.

Refer to Tables 4-5 and 4-6 for device identification

data.

TABLE 4-5:

JEDEC READ-ID DATA

Manufacturer’s ID

Device ID

Memory Type

Memory Capacity

Byte1

Byte 2

Byte 3

BFH

25H

8DH

25134 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 4-6:

PRODUCT IDENTIFICATION

Address

Data

Manufacturer’s ID

00000H

BFH

Device ID

00001H

8DH

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