GD25Q40CSFG datasheet(35/64 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q40C

Address

A23-A16

A15-A8

A7-A0

Security Registers

00000000

Don’t Care

Figure 34. Erase Security Registers command Sequence Diagram

7.30.

Program Security Registers (42H)

The Program Security Registers command is similar to the Page Program command. It allows from 1 to 256 bytes

Security Registers data to be programmed. A Write Enable (WREN) command must previously have been executed to set

the Write Enable Latch (WEL) bit before sending the Program Security Registers command. The Program Security Registers

command is entered by driving CS# Low, followed by the command code (42H), three address bytes and at least one data

byte on SI. As soon as CS# is driven high, the self-timed Program Security Registers cycle (whose duration is tPP) is

initiated. While the Program Security Registers cycle is in progress, the Status Register may 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 Program Security Registers cycle,

and is 0 when it is completed. At some unspecified time before the cycle is completed, the Write Enable Latch (WEL) bit is

reset.

If the Security Registers Lock Bit (LB) is set to 1, the Security Registers will be permanently locked. Program Security

Registers command will be ignored.

Address

A23-A16

A15-A8

A7-A0

Security Registers 0

00H

Byte Address

Security Registers 1

00H

01H

Byte Address

Security Registers 2

00H

02H

Byte Address

Security Registers 3

00H

03H

Byte Address

Figure 35. Program Security Registers command Sequence Diagram

Command

44H

CS#

SCLK

29 30 31

MSB

24 Bits Address

23 22

Command

42H

CS#

SCLK

9 10

28 29 30 31

23 22 21

24-bit address

42 43 44 45

46 47

50 51 52 53

54 55

CS#

SCLK

MSB

Data Byte 2

32 33 34 35

MSB

Data Byte 1

Data Byte 3

Data Byte 256

MSB

36 37 38 39

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