M25P128-VMF6TP datasheet(18/41 Pages) STMICROELECTRONICS

18 / 41 page

Instructions

M25P128

18/41

Rev. 1

6.3

Read Identification (RDID)

The Read Identification (RDID) instruction allows the 8-bit manufacturer identification to be

read, followed by two bytes of device identification. The manufacturer identification is

assigned by JEDEC, and has the value 20h for STMicroelectronics. The device identification

is assigned by the device manufacturer, and indicates the memory type in the first byte

(20h), and the memory capacity of the device in the second byte (18h).

Any Read Identification (RDID) instruction while an Erase or Program cycle is in progress, is

not decoded, and has no effect on the cycle that is in progress.

The device is first selected by driving Chip Select (S) Low. Then, the 8-bit instruction code

for the instruction is shifted in. This is followed by the 24-bit device identification, stored in

the memory, being shifted out on Serial Data Output (Q), each bit being shifted out during

the falling edge of Serial Clock (C).

The instruction sequence is shown in Figure 10.

The Read Identification (RDID) instruction is terminated by driving Chip Select (S) High at

any time during data output.

When Chip Select (S) is driven High, the device is put in the Standby Power mode. Once in

the Standby Power mode, the device waits to be selected, so that it can receive, decode and

execute instructions.

Figure 10. Read Identification (RDID) Instruction Sequence and Data-Out Sequence

Table 5.

Read Identification (RDID) Data-Out Sequence

Manufacturer Identification

Device Identification

Memory Type

Memory Capacity

20h

18h

3456789 10 11 12 13 14 15

Instruction

AI06809b

Manufacturer Identification

High Impedance

MSB

15 14 13

3210

Device Identification

MSB

16 17 18

28 29 30 31

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