GD25B256DFIS datasheet(57/82 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B256D

Figure 65 Erase Security Registers command Sequence Diagram (ADS=0)

Figure 66 Erase Security Registers command Sequence Diagram (ADS=1)

7.34.

Program Security Registers (42H)

The Program Security Registers command is similar to the Page Program command. Each security register contains

four pages content. 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 (LB3-1) is set to 1, the Security Registers will be permanently locked. Program

Security Registers command will be ignored.

Table 19 Security Registers

Address

A23-16

A15-12

A11

A10-0

Security Register #1

00H

0 0 0 1

Byte Address

Security Register #2

00H

0 0 1 0

Byte Address

Security Register #3

00H

0 0 1 1

Byte Address

Command

44H

CS#

SCLK

29 30 31

MSB

24 Bits Address

23 22

Command

44H

CS#

SCLK

37 38 39

MSB

32 Bits Address

31 30

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