M25PE16-VMP6TP datasheet(24/58 Pages) NUMONYX

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Instructions

M25PE16

24/58

6.3

Read identification (RDID)

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

●

Manufacturer identification (1 byte)

●

Device identification (2 bytes)

●

A unique ID code (UID) (17 bytes, of which 16 available upon customer request)

The manufacturer identification is assigned by JEDEC, and has the value 20h for Numonyx.

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 (15h).

The UID contains the length of the following data in the first byte (set to 10h), and 16 bytes

of the optional customized factory data (CFD) content. The CFD bytes are read-only and

can be programmed with customers data upon their demand. If the customers do not make

requests, the device is shipped with all the CFD bytes programmed to zero (00h).

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. After this, the 24-bit device identification, stored in the

memory, the 8-bit CFD length followed by 16 bytes of CFD content will be shifted out on

serial data output (Q). Each bit is shifted out during the falling edge of Serial Clock (C).

The instruction sequence is shown in Figure 8.

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 8.

Read identification (RDID) instruction sequence and data-out sequence

Table 6.

Read identification (RDID) data-out sequence

Manufacturer

identification

Device identification

UID

Memory type

Memory capacity

CFD length

CFD content

20h

80h

15h

10h

16 bytes

456789 10 11 12 13 14 15

Instruction

AI06809c

Manufacturer identification

High Impedance

MSB

Device identification

MSB

15 14 13

16 17 18

28 29 30 31

MSB

UID

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