M25P64-VMF6TPBA datasheet(25/55 Pages) NUMONYX

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M25P64

Instructions

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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).(1)

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 (20h), and the memory capacity of the device in the second byte (17h).

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 devices are 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 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 CFD length followed by 16 bytes of CFD 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.

The UID feature is available only for process technology T9HX devices, identified by process identification digit

"4" in the device marking.

Table 5.

Read identification (RDID) data-out sequence

Manufacturer identification

Device identification

UID

Memory type

Memory capacity

CFD length

CFD content

20h

17h

10h

16 bytes

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