A25LS512A datasheet(24/43 Pages) AMICC

24 / 43 page

A25LS512A Series

(November, 2014, Version 1.1)

AMIC Technology Corp.

Read Device Identification (RDID)

The Read Identification (RDID) instruction allows the 8-bit

manufacturer identification code to be read, followed by two

bytes of device identification. The manufacturer identification

is assigned by JEDEC, and has the value 37h. The device

identification is assigned by the device manufacturer, and

indicates the memory in the first bytes (30h), and the memory

capacity of the device in the second byte.

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.

This is followed by the 24-bit device identification, stored in

the memory, being shifted out on Serial Data Output (DO),

each bit being shifted out during the falling edge of Serial

Clock (C).

The instruction sequence is shown in Figure 17. 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

Stand-by Power mode. Once in the Stand-by Power mode,

the device waits to be selected, so that it can receive, decode

and execute instructions.

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

Manufacture Identification

Device Identification

Manufacture ID

Memory Type

Memory Capacity

C2h

20h

10h

Figure 17. Read Identification (RDID) Instruction Sequence and Data-Out Sequence

DIO

Instruction

High Impedance

810

3 4

5 6

22 23 24 25 26

Manufacture ID

Memory Type

15 14 13

23 22 21

18 17 16

16 17 18

Memory Capacity

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