A25LQ080 Series
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 byte (40h), and the memory
capacity of the device in the second byte (14h for
A25LQ080).
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 23. The Read
Identification (RDID) instruction is terminated by driving Chip
S
Select ( ) High at any time during data output.
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.
S
When Chip Select ( ) 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.
S
The device is first selected by driving Chip Select ( ) Low.
Then, the 8-bit instruction code for the instruction is shifted in.
Table 6. Read Identification (READ_ID) Data-Out Sequence
Manufacture Identification
Device Identification
Manufacture ID
37h
Memory Type
40h
Memory Capacity
14h (A25LQ080)
Figure 23. Read Identification (RDID) Instruction Sequence and Data-Out Sequence
S
0
1
2
3
4
5
6
7
8
9
10
13 14 15 16 17 18
21 22 23 24 25 26
29 30 31
C
Instruction (9Fh)
IO0
23
21
18
16 15
13
14
10
8
7
6
5
2
1
0
22
17
9
IO1
High Impedance
Manufacture ID
Memory Type
Memory Capacity
(April, 2016, Version 1.0)
33
AMIC Technology Corp.
AMICC [ AMIC TECHNOLOGY ]
