M25PX16
Instructions
See Section 12: Ordering information on page 62 for CFD programmed devices.
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 Read Identification (RDID) instruction should not be issued while the device is in Deep
Power-down mode.
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 (DQ1). 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 6.
Read Identification (RDID) data-out sequence
Device identification
UID
Manufacturer identification
Memory type
71h
Memory capacity
15h
CFD length
CFD content
20h
10h
16 bytes
Figure 10. Read Identification (RDID) instruction sequence and data-out sequence
S
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
16 17 18
28 29 30 31
C
Instruction
DQ0
Manufacturer identification
Device identification
UID
High Impedance
DQ1
15 14 13
MSB
3
2
1
0
MSB
MSB
AI06809d
6.4
Read Status Register (RDSR)
The Read Status Register (RDSR) instruction allows the Status Register to be read. The
Status Register may be read at any time, even while a Program, Erase or Write Status
Register cycle is in progress. When one of these cycles is in progress, it is recommended to
check the Write In Progress (WIP) bit before sending a new instruction to the device. It is
also possible to read the Status Register continuously, as shown in Figure 11.
25/65
MICRON [ MICRON TECHNOLOGY ]
