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GD5F2GQ4RF9FG Scheda tecnica(PDF) 30 Page - GigaDevice Semiconductor (Beijing) Inc.

Il numero della parte GD5F2GQ4RF9FG
Spiegazioni elettronici  SPI(x1/x2/x4) NAND Flash
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Produttore elettronici  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Homepage  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

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SPI(x1/x2/x4) NAND Flash
2G
30
14 ADVANCED FEATURES
14.1 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).
Table14-1. OTP States
OTP_PRT
OTP_EN
State
x
0
Normal operation
0
1
Access OTP region, read and program data.
1
1
1.
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.
2.
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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