EN25Q40_11 Datasheet, PDF (12/49 Pages) Eon Silicon Solution Inc. – 4 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

Table 5. Manufacturer and Device Identification
OP Code
ABh
90h
9Fh
(M7-M0)
1Ch
1Ch
(ID15-ID0)
3013h
(ID7-ID0)
12h
12h
EN25Q40
Enable Quad I/O (EQIO) (38h)
The Enable Quad I/O (EQIO) 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 I/O (EQIO) (38h) turns on.
Figure 5. Enable Quad I/O Sequence Diagram
Reset Quad I/O (RSTQIO) (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.
This Data Sheet may be revised by subsequent versions
12
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. F, Issue Date: 2011/11/02
www.eonssi.com