A25L40PT-F AMICC [AMIC Technology], A25L40PT-F Datasheet - Page 21

• Manufacturer Part Number: A25L40PT-F
• Description: 4 Mbit, Low Voltage, Serial Flash Memory With 85MHz SPI Bus Interface
• Manufacturer: AMICC [AMIC Technology]

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, plus the
continuation identification for AMIC Technology. The device
identification is assigned by the device manufacturer, and
indicates the memory in the first bytes (20h), and the memory
capacity of the device in the second byte (13h).
The Device Identification of memory capacity is 13h.
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 (
Figure 16. Read Identification (RDID) Data-Out Sequence
PRELIMINARY
Q
C
D
S
Continuation ID
7Fh
High Impedance
0 1
(May, 2007, Version 0.4)
Manufacture Identification
2
Instruction
3
4
5 6
Table 6. Read Identification (READ_ID) Data-Out Sequence
7
31 30 29
8
Manufacture ID
Continuation ID
9
10
37h
26 25 24
13
S
14
) Low.
15
23 22 21
16 17 18
Manufacture ID
20
Then, the 8-bit instruction code for the instruction is shifted in.
This is followed by the 32-bit device identification, stored in
the memory, being shifted out on Serial Data Output (Q),
each bit being shifted out during the falling edge of Serial
Clock (C).
The instruction sequence is shown in Figure 16. The Read
Identification (RDID) instruction is terminated by driving Chip
Select (
When Chip Select (
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.
18 17 16
21
22 23 24 25 26
S
Memory Type
) High at any time during data output.
20h
15 14 13
Memory Type
Device Identification
S
) is driven High, the device is put in the
10
29
AMIC Technology Corp.
30
9
8
31
7
32
A25L40P Series
Memory Capacity
33
6
Memory Capacity
34
5
13h
2
37
1
38
0
39