M25PX32-VMP6F datasheet(27/63 Pages) STMICROELECTRONICS

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M25PX32

Instructions

27/63

6.3

Read Identification (RDID)

The Read Identification (RDID) instruction allows to read the device identification data:

●

Manufacturer identification (one byte)

●

Device identification (two bytes)

●

A Unique ID code (UID) followed by 16 bytes of CFI data

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 (71h), and the memory capacity of the device in

the second byte (16h). The UID is set to 10h and indicates that 16 bytes, related to the CFI

content, are following.

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 Read Identification (RDID) instruction should not be issued while the device is in Deep

Power-down mode.

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

for the instruction is shifted in. After this, the 24-bit device identification, stored in the

memory, the 8-bit Unique ID code followed by 16 bytes of CFI content will be shifted out on

Serial Data output (DQ1). Each bit is 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 6.

Read Identification (RDID) data-out sequence

Manufacturer identification

Device identification

UID

CFI content

Memory type

Memory capacity

20h

71h

16h

10h

16 bytes

DQ0

456789 10 11 12 13 14 15

Instruction

AI06809d

DQ1

Manufacturer Identification

High Impedance

MSB

Device Identification

MSB

15 14 13

16 17 18

28 29 30 31

MSB

UID + CFI Data

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