EN25Q16A
Table 5. Manufacturer and Device Identification
OP Code
ABh
90h
9Fh
1Ch
1Ch
3015h
(M7-M0)
(ID15-ID0)
(ID7-ID0)
14h
14h
Enable Quad Peripheral Interface mode (EQPI) (38h)
The Enable Quad Peripheral Interface mode (EQPI) instruction will enable the flash device for Quad
SPI bus operation. Upon completion of the instruction, all instructions thereafter will be 4-bit multiplexed
input/output until a power cycle or “ Reset Quad I/O instruction “ instruction, as shown in Figure 5. The
device did not support the Read Data Bytes (READ) (03h), Dual Output Fast Read (3Bh) and Dual
Input/Output FAST_READ (BBh) modes while the Enable Quad Peripheral Interface mode (EQPI) (38h)
turns on.
Figure 5. Enable Quad Peripheral Interface mode Sequence Diagram
Reset Quad I/O (RSTQIO) or Release Quad I/O Fast Read Enhancement Mode (FFh)
The Reset Quad I/O instruction resets the device to 1-bit Standard SPI operation. To execute a Reset
Quad I/O operation, the host drives CS# low, sends the Reset Quad I/O command cycle (FFh) then,
drives CS# high. This command can’t be used in Standard SPI mode.
User also can use the 0xFFh command to release the Quad I/O Fast Read Enhancement Mode. The
detail description, please see the Quad I/O Fast Read Enhancement Mode section.
Note:
If the system is in the Quad I/O Fast Read Enhance Mode under EQPI Mode, it is necessary to execute
0xFFh command by two times. The first 0xFFh command is to release Quad I/O Fast Read Enhance
Mode, and the second 0xFFh command is to release EQPI Mode.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
13
©2004 Eon Silicon Solution, Inc.,
www.eonssi.com
Rev. E, Issue Date: 2011/07/14
EON [ EON SILICON SOLUTION INC. ]
