M45PE40 datasheet(13/35 Pages) STMICROELECTRONICS

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M45PE40

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 (40h), and the memory capacity of the

device in the second byte (13h).

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 9..

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 5. Read Identification (RDID) Data-Out Sequence

Figure 9. Read Identification (RDID) Instruction Sequence and Data-Out Sequence

Manufacturer Identification

Device Identification

Memory Type

Memory Capacity

20h

40h

13h

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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