GD5F1GQ4REFJS datasheet(41/60 Pages) GIGADEVICE

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SPI(x1/x2/x4) NAND Flash

13 ADVANCED FEATURES

13.1 OTP REGION

The serial device offers a protected, One-Time Programmable NAND Flash memory area. 4 full pages (2176 bytes per

page) are available on the device. Customers can use the OTP area any way they want, like programming serial numbers,

or other data, for permanent storage. When delivered from factory, feature bit OTP_PRT is 0.

To access the OTP feature, the user must set feature bits OTP_EN/OTP_PRT by SET FEATURES command. When the

OTP is ready for access, pages 00h

–03H can be programmed in sequential order by PROGRAM LOAD (02H) and

PROGRAM EXECUTE (10H) commands ( when not yet protected), and read out by PAGE READ (13H) command and

output data by READ from CACHE(03H/0BH/3BH/6BH/BBH/EBH).

Table13-1. OTP States

OTP_PRT

OTP_EN

State

Normal operation

Access OTP region, read and program data.

When the device power on state OTP_PRT is 0, user can set feature bit

OTP_PRT and OTP_EN to 1, then issue PROGRAM EXECUTE (10H) to

lock OTP, and after that OTP_PRT will permanently remain 1.

When the device power on state OTP_PRT is 1, user can only read the

OTP region data.

Note: The OTP space cannot be erased and after it has been protected, it cannot be programmed again, please use this function

carefully.

Access to OTP data

• Issue the SET FEATURES command (1FH)

• Set feature bit OTP_EN

• Issue the PAGE PROGRAM (only when OTP_PRT is 0) or PAGE READ command

Protect OTP region

Only when the following steps are completed, the OTP_PRT will be set and users can get this feature out with 0FH

command.

• Issue the SET FEATURES command (1FH)

• Set feature bit OTP_EN and OTP_PRT

• 06H (WRITE ENABLE)

• Issue the PROGRAM EXECUTE (10H) command.

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