GD25Q256DFES datasheet(61/89 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q256D

7.36.

Enable Reset (66H) and Reset (99H)

If the Reset command is accepted, any on-going internal operation will be terminated and the device will return to its

default power-on state and lose all the current volatile settings, such as Volatile Status Register bits, Write Enable Latch

status (WEL), Program/Erase Suspend status, Continuous Read Mode bit setting (M7-M0) and Wrap Bit Setting (W6-W4).

The “Enable Reset (66H)” and the “Reset (99H)” commands can be issued in SPI mode. The “Reset (99H)” command

sequence as follow: CS# goes low  Sending Enable Reset command  CS# goes high  CS# goes low  Sending

Reset command  CS# goes high. Once the Reset command is accepted by the device, the device will take approximately

tRST to reset. During this period, no command will be accepted. Data corruption may happen if there is an on-going or

suspended internal Erase or Program operation when Reset command sequence is accepted by the device. It is

recommended to check the BUSY bit and the SUS bit in Status Register before issuing the Reset command sequence.

Figure 73. Enable Reset and Reset command Sequence Diagram

7.37. Read Serial Flash Discoverable Parameter (5AH)

The Serial Flash Discoverable Parameter (SFDP) standard provides a consistent method of describing the functional

and feature capabilities of serial flash devices in a standard set of internal parameter tables. These parameter tables can

be interrogated by host system software to enable adjustments needed to accommodate divergent features from multiple

vendors. The concept is similar to the one found in the Introduction of JEDEC Standard, JESD68 on CFI. SFDP is a standard

of JEDEC Standard No.216B.

Figure 74. Read Serial Flash Discoverable Parameter command Sequence Diagram

Command

5AH

CS#

SCLK

High-Z

9 10

28 29 30 31

23 22 21

24-bit address

MSB

34 35 36 37

38 39

Data Out1

42 43 44 45

46 47

Data Out2

CS#

SCLK

MSB

Dummy Byte

Command

66H

CS#

SCLK

High-Z

Command

99H

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