ES25P40 datasheet(17/35 Pages) EXCELSEMI

17 / 35 page

ES I

Rev. 0D May 11 , 2006

ES25P40

Excel Semiconductor inc.

ADVANCED INFORMATION

12 13 14

15 16

17 18

Figure 11. Read Identification (RDID) Instruction Sequence and Data-Out Sequence

SCK

CS#

Device Identification

MSB

Instruction

Manufacturer Identification

High Impedance

Read Manufacturer ID & Device ID

(RDMD)

The Read Manufacturer ID & Device ID (RDMD)

instruction is an alternative to the Release from

Power-down/Device ID instruction that provides both

the JEDEC assigned manufacturer ID and the spe-

cific device ID.

The Read Manufacturer ID & Device ID (RDMD)

instruction is very similar to the Release from Power-

down/Device ID instruction.

The instruction is initiated by driving the CS# pin low

and shift the instruction code “90h” followed by three

dummy bytes. After which, the Manufacturer ID for

ESI (4Ah) and the Device ID (12h) are shifted out on

the falling edge SCLK with most significant bit (MSB)

first as shown in Figure 12. The Manufacturer and

Device IDs can be read continuously, alternating

from one to the other. The instruction is completed

by driving CS# pin.

Figure 12. Read Manufacturer ID & Device ID (RDMD) Instruction Sequence and

Data-Out Sequence

31 32

34 35

37 38

SCK

CS#

Manufacturer ID

MSB

Instruction

High Impedance

3 Dummy bytes

Device ID

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