A25L20P 查看數據表（PDF） - AMIC Technology

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A25L20P

2Mbit / 1Mbit / 512Kbit, Low Voltage, Serial Flash Memory With 85MHz SPI Bus Interface

AMIC Technology 

Release from Deep Power-down and Read

Electronic Signature (RES)

Once the device has entered the Deep Power-down mode,

all instructions are ignored except the Release from Deep

Power-down and Read Electronic Signature (RES)

instruction. Executing this instruction takes the device out of

the Deep Power-down mode.

The instruction can also be used to read, on Serial Data

Output (DO), the 8-bit Electronic Signature, whose value for

the A25L20P is 11h, A25L10P is 10h, and A25L05P is 05h.

Except while an Erase, Program or Write Status Register

cycle is in progress, the Release from Deep Power-down and

Read Electronic Signature (RES) instruction always provides

access to the 8-bit Electronic Signature of the device, and

can be applied even if the Deep Power-down mode has not

been entered.

Any Release from Deep Power-down and Read Electronic

Signature (RES) instruction while an Erase, Program or Write

Status Register 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.

The instruction code is followed by 3 dummy bytes, each bit

being latched-in on Serial Data Input (DIO) during the rising

A25L20P/A25L10P/A25L05P Series

edge of Serial Clock (C). Then, the 8-bit Electronic Signature,

stored in the memory, is 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 Release from Deep Power-down and Read Electronic

Signature (RES) instruction is terminated by driving Chip

Select ( S ) High after the Electronic Signature has been read

at least once. Sending additional clock cycles on Serial Clock

(C), while Chip Select ( S ) is driven Low, cause the

Electronic Signature to be output repeatedly.

When Chip Select ( S ) is driven High, the device is put in the

Stand-by Power mode. If the device was not previously in the

Deep Power-down mode, the transition to the Stand-by

Power mode is immediate. If the device was previously in the

Deep Power-down mode, though, the transition to the Stand-

by Power mode is delayed by tRES2, and Chip Select ( S )

must remain High for at least tRES2 (max), as specified in AC

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

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

and execute instructions.

Figure 17. Release from Deep Power-down and Read Electronic Signature (RES) Instruction Sequence and

Data-Out Sequence

S

0 1 2 3 4 5 6 7 8 9 10 28 29 30 31 32 33 34 35 36 37 38

C

Instruction

3 Dummy Bytes

tRES2

DIO

23 22 21 3 2 1 0

MSB

High Impedance

DO

76543210

MSB

Deep Power-down Mode

Stand-by Mode

Note: The value of the 8-bit Electronic Signature, for the A25L20P is 11h, A25L10P is 10h, and A25L05P is 05h.

(August, 2007, Version 1.0)

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AMIC Technology Corp.

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