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
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.
S
Select ( ) High after the Electronic Signature has been read
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.
at least once. Sending additional clock cycles on Serial Clock
S
(C), while Chip Select ( ) is driven Low, cause the
Electronic Signature to be output repeatedly.
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.
S
When Chip Select ( ) 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-
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.
S
by Power mode is delayed by tRES2, and Chip Select (
)
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.
S
The device is first selected by driving Chip Select ( ) Low.
The instruction code is followed by 3 dummy bytes, each bit
being latched-in on Serial Data Input (DIO) during the rising
Figure 17. Release from Deep Power-down and Read Electronic Signature (RES) Instruction Sequence and
Data-Out Sequence
S
6
0
1
2
3
4
5
7
8
9 10
28 29 30 31 32 33 34 35 36 37 38
C
DIO
DO
tRES2
Instruction
3 Dummy Bytes
21
23
2
1
0
22
3
MSB
High Impedance
5
4
1
0
6
3
2
7
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)
25
AMIC Technology Corp.
AMICC [ AMIC TECHNOLOGY ]
