M25PE20 datasheet(14/37 Pages) STMICROELECTRONICS

14 / 37 page

M25PE10, M25PE20

14/37

Read Identification (RDID)

The Read Identification (RDID) instruction allows

the 8-bit manufacturer identification to be read, fol-

lowed 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 (80h), and the memory capacity of

the device in the second Byte (12h for the

M25PE20 and 11h for the M25PE10).

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 in-

struction 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 be-

ing shifted out during the falling edge of Serial

Clock (C).

The instruction sequence is shown in Figure 10..

The Read Identification (RDID) instruction is termi-

nated 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 se-

lected, so that it can receive, decode and execute

instructions.

Table 6. Read Identification (RDID) Data-Out Sequence

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

Manufacturer Identification

Device Identification

Memory Type

Memory Capacity

20h

80h

12h (M25PE20)

20h

80h

11h (M25PE10)

3456789 10 11 12 13 14 15

Instruction

AI06809

Manufacturer Identification

High Impedance

MSB

15 14 13

3210

Device Identification

MSB

16 16 18

28 29 30 31

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