n25q256 Numonyx, n25q256 Datasheet - Page 136

• Manufacturer Part Number: n25q256
• Description: 256-mbit 3 V, Multiple I/o, 4-kbyte Subsector Erase, Xip Enabled, Serial Flash Memory With 108 Mhz Spi Bus Interface
• Manufacturer: Numonyx

Instructions
9.3.1
136/186
DQ0
Multiple I/O Read Identification (MIORDID)
The Multiple Input/Output Read Identification (MIORDID) instruction allows to read the
device identification data in the QIO-SPI protocol:
Unlike the RDID instruction of the Extended SPI protocol, the Multiple Input/Output
instruction can not read the Unique ID code (UID) (17 bytes).
For further details on the manufacturer and device identification codes, see
Identification
Any Multiple Input/Output Read Identification (MIORDID) 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 parallel on the 4 pins DQ0, DQ1, DQ2 and DQ3. After this, the
24-bit device identification, stored in the memory, will be shifted out on again in parallel on
DQ0, DQ1, DQ2 and DQ3. The identification bits are shifted out 4 at a time during the falling
edge of Serial Clock (C).
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.
Figure 95. Multiple I/O Read Identification instruction and data-out sequence QIO-
DQ3
DQ1
DQ2
S
C
Manufacturer identification (1 byte)
Device identification (2 bytes)
SPI
(RDID).
AFh
0
1
5
MAN.
code
4
6
7
2
1
0
2
3
3
5
4
6
7
DEV.
code
4
1
0
2
3
5
Micron Technology, Inc., reserves the right to change products or specifications without notice.
5
4
6
7
SIZE
code
6
1
0
2
3
7
8
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9.1.1: Read
N25Q256 - 3 V