M25PE20, M25PE10
Instructions
6.3
Read Identification (RDID)
The Read Identification (RDID) instruction allows to read the device identification data:
●
●
●
Manufacturer identification (1 byte)
Device identification (2 bytes)
(a)
A Unique ID code (UID) (17 bytes, of which 16 available upon customer request) .
The manufacturer identification is assigned by JEDEC, and has the value 20h for Numonyx.
The device identification is assigned by the device manufacturer, and indicates the memory
type in the first byte (80h), and the memory capacity of the device in the second byte (12h
for the M25PE20 and 11h for the M25PE10). The UID contains the length of the following
data in the first byte (set to 10h), and 16 bytes of the optional Customized Factory Data
(CFD) content. The CFD bytes are read-only and can be programmed with customers data
upon their demand. If the customers do not make requests, the devices are shipped with all
the CFD bytes programmed to zero (00h).
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 (S) Low. Then, the 8-bit instruction code
for the instruction is shifted in. After this, the 24-bit device identification, stored in the
memory, the 8-bit CFD length followed by 16 bytes of CFD content will be shifted out on
Serial Data output (Q). Each bit is shifted out during the falling edge of Serial Clock (C).
The instruction sequence is shown in Figure 10.
The Read Identification (RDID) instruction is terminated by driving Chip Select (S) High at
any time during data output.
When Chip Select (S) is driven High, the device is put in the Standby Power mode. Once in
the Standby Power mode, the device waits to be selected, so that it can receive, decode and
execute instructions.
Table 8.
Read Identification (RDID) data-out sequence
Device identification
UID(1)
Manufacturer
identification
Memory type
Memory capacity
CFD length
CFD content
20h
20h
80h
80h
12h (M25PE20)
11h (M25PE10)
10h
10h
16 bytes
16 bytes
1. The Unique ID code is available only in the T9HX process (see Important note on page 6).
a. The 17 bytes of Unique ID code are available only in the T9HX process (see Important note on
page 6).
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NUMONYX [ NUMONYX B.V ]
