AT25QL641 datasheet(51/80 Pages) RENESAS

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DS-AT25QL641-130 Rev. G

Page 51

Sep 14, 2022

AT25QL641 Datasheet

8.27 Read Manufacturer / Device ID Quad I/O (94h)

The Read Manufacturer/Device ID Quad I/O command provides both the JEDEC assigned manufacturer ID and

the specific device ID. This command allows both address and manufacturer/device ID information to be driven on

the SI (IO0), SO (IO1), WP (IO2), and HOLD (IO3) pins. During the address transfer, the IO0, IO1, IO2, and IO3 pins

are inputs, allowing the 24-bit address to be transferred in only 6 clocks. Device hardware then switches these

pins to outputs and drives the manufacturer/device ID information on these pins, transferring the information in

one-fourth the number of clocks required by the 90h command. The 94h command is called a 1,4,4 transfer,

where the command in transferred on a single pin (IO0), and the address and data are driven on a four pins (IO0 -

IO3).

The command is initiated by driving the CS pin low and shifting the command code 94h followed by a 24-bit

address (A23-A0) of 000000h. After which, the Manufacturer ID for Renesas Electronics (1Fh) and the Device ID

(17h) are shifted out on the falling edge of SCK with most significant bit (MSB) first as shown in Figure 48. If the

24-bit address is initially set to 000001h the Device ID is read first and then followed by the Manufacturer ID.

The Manufacturer and Device ID can be read continuously, alternating from one to the other. The command is

completed by driving CS high.

Figure 48. Read Quad Manufacturer/ Device ID Quad I/O Command (SPI Mode)

10 11 12 13 14 15 16 17 18 19 20 21

22 23

Command

94h

A23-16

A15-8

A7-0

23 24 25 26

27 28 29 30

SCK

IO0

IO1

SCK

IO0

IO1

High-Impedance

IO2

IO3

MFR ID

(repeat)

IO2

IO3

dummy

MFR ID Device ID

DID ID

(repeat)

MFR ID

(repeat)

DID ID

(repeat)

High-Impedance

M7-0

(00h or 01h)

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