ACE25QC200GLFMLTH datasheet(45/64 Pages) ACE

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ACE25QC200GL

2M BIT SPI NOR FLASH

VER 1.1

Erase Security Registers (44h)

The ACE25QC200GL offers three 512-byte Security Registers which can be erased and programmed

individually. These registers may be used by the system manufacturers to store security and other

important information separately from the main memory array.

The Erase Security Register instruction is similar to the Sector Erase instruction. A Write Enable instruction

must be executed before the device will accept the Erase Security Register Instruction (Status Register bit

WEL must equal 1). The instruction is initiated by driving the /CS pin low and shifting the instruction code

“44h” followed by a 24-bit address (A23-A0) to erase one of the three security registers.

Address

A23-16

A15-12

A11-8

A8-0

Security Registers 1

00H

0001

0000

Don’t Care

Security Registers 2

00H

0010

0000

Don’t Care

Security Registers 3

00H

0011

0000

Don’t Care

The Erase Security Register instruction sequence is shown in Figure35. The /CS pin must be driven high

after the eighth bit of the last byte has been latched. If this is not done the instruction will not be executed.

After /CS is driven high, the self-timed Erase Security Register operation will commence for a time duration

of tSE (See AC Characteristics). While the Erase Security Register cycle is in progress, the Read Status

the erase cycle and becomes a 0 when the cycle is finished and the device is ready to accept other

instructions again. After the Erase Security Register cycle has finished the Write Enable Latch (WEL) bit in

the Status Register is cleared to 0. The Security Register Lock Bits (LB3-1) in the Status Register-2 can be

used to OTP protect the security registers. Once a lock bit is set to 1, the corresponding security register

(LB3-1 corresponds to S13-11) will be permanently locked, Erase Security Register instruction to that

Figure34. Program/Erase Resume Instruction

Figure35. Erase Security Registers Instruction

ACE25QC200GLFMLTH Datasheet(PDF) 45 Page - ACE Technology Co., LTD.

ACE25QC200GLFMLTH Datasheet(HTML) 45 Page - ACE Technology Co., LTD.

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