M25PX16 Serial Flash Embedded Memory
READ IDENTIFICATION
READ IDENTIFICATION
The READ IDENTIFICATION command reads the following device identification data:
• Manufacturer identification (1 byte): This is assigned by JEDEC.
• Device identification (2 bytes): This is assigned by device manufacturer; the first byte
indicates memory type and the second byte indicates device memory capacity.
• A Unique ID code (UID) (17 bytes,16 available upon customer request): The first byte
contains length of data to follow; the remaining 16 bytes contain optional Customized
Factory Data (CFD) content.
Table 8: READ IDENTIFICATION Data Out Sequence
Device Identification
UID
Manufacturer
Identification
Memory Type
Memory Capacity
CFD Length
CFD Content
20h
71h
15h
10h
16 bytes
1. The CFD bytes are read-only and can be programmed with customer data upon demand.
If customers do not make requests, the devices are shipped with all the CFD bytes pro-
grammed to zero.
Note:
A READ IDENTIFICATION command is not decoded while an ERASE or PROGRAM cy-
cle is in progress and has no effect on a cycle in progress. The READ IDENTIFICATION
command must not be issued while the device is in DEEP POWER-DOWN mode.
The device is first selected by driving S# LOW. Then the 8-bit command code is shifted
in and content is shifted out on DQ1 as follows: the 24-bit device identification that is
stored in the memory, the 8-bit CFD length, followed by 16 bytes of CFD content. Each
bit is shifted out during the falling edge of serial clock (C).
The READ IDENTIFICATION command is terminated by driving S# HIGH at any time
during data output. When S# is driven HIGH, the device is put in the STANDBY POWER
mode and waits to be selected so that it can receive, decode, and execute commands.
Figure 10: READ IDENTIFICATION Command Sequence
0
7
8
15
16
31
32
C
LSB
DQ0
Command
High-Z
MSB
LSB
LSB
LSB
DOUT
MSB
DOUT
DOUT
MSB
DOUT
DOUT
MSB
DOUT
DQ1
Manufacturer
identification
Device
identification
UID
Don’t Care
PDF: 09005aef845665a5
m25px16.pdf - Rev. A 11/12 EN
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