GD25Q40C datasheet(17/64 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q40C

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 read 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.

Figure 4. Read Status Register Sequence Diagram

7.4. Write Status Register (WRSR) (01H)

The Write Status Register (WRSR) command allows new values to be written to the Status Register. Before it can be

accepted, a Write Enable (WREN) command must previously have been executed. After the Write Enable (WREN)

command has been decoded and executed, the device sets the Write Enable Latch (WEL).

The Write Status Register (WRSR) command has no effect on S15, S13, S12, S11, S1 and S0 of the Status Register.

CS# must be driven high after the eighth or sixteen bit of the data byte has been latched in. If not, the Write Status Register

(WRSR) command is not executed. If CS# is driven high after eighth bit of the data byte, the CMP and QE bit will be cleared

to 0. As soon as CS# is driven high, the self-timed Write Status Register cycle (whose duration is tW) is initiated. While the

Write Status Register cycle is in progress, the Status Register may still be read to check the value of the Write In Progress

(WIP) bit. The Write In Progress (WIP) bit is 1 during the self-timed Write Status Register cycle, and is 0 when it is completed.

When the cycle is completed, the Write Enable Latch (WEL) is reset.

The Write Status Register (WRSR) command allows the user to change the values of the Block Protect (BP4, BP3,

BP2, BP1, BP0) bits, to define the size of the area that is to be treated as read-only, as defined in Table1. The Write Status

the Write Protect (WP#) signal. The Status Register Protect (SRP) bit and Write Protect (WP#) signal allow the device to

be put in the Hardware Protected Mode. The Write Status Register (WRSR) command is not executed once the Hardware

Protected Mode is entered.

Figure 5. Write Status Register Sequence Diagram

Command

05H or 35H

CS#

SCLK

High-Z

9 10 11 12 13 14 15

MSB

S7~S0 or S15~S8 out

MSB

Command

01H

CS#

SCLK

High-Z

9 10 11 12 13 14 15

MSB

Status Register in

16 17 18 19 20 21 22 23

15 14 13 12 11 10 9

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