GD25VE40C datasheet(16/55 Pages) GIGADEVICE

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Uniform Sector

Dual and Quad Serial Flash

GD25VE40C

7.1. Write Enable (WREN) (06H)

The Write Enable (WREN) command is for setting the Write Enable Latch (WEL) bit. The Write Enable Latch (WEL)

bit must be set prior to every Page Program (PP), Sector Erase (SE), Block Erase (BE), Chip Erase (CE), Write Status

goes low  sending the Write Enable command  CS# goes high.

Figure 2. Write Enable Sequence Diagram

7.2. Write Disable (WRDI) (04H)

The Write Disable command is for resetting the Write Enable Latch (WEL) bit. The Write Disable command sequence:

CS# goes low Sending the Write Disable command CS# goes high. The WEL bit is reset by following condition: Power-

up and upon completion of the Write Status Register, Page Program, Sector Erase, Block Erase, Chip Erase,

Erase/Program Security Registers and Reset commands.

Figure 3. Write Disable Sequence Diagram

7.3. Read Status Register (RDSR) (05H or 35H)

The Read Status Register (RDSR) command is for reading the Status Register. 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 command to the device. It is also possible

to r

ead the Status Register continuously. For command code “05H”, the SO will output Status Register bits S7~S0. The

command code “35H”, the SO will output Status Register bits S15~S8.

Command

06H

CS#

SCLK

High-Z

Command

04H

CS#

SCLK

High-Z

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