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What is the use of Write Disable (WRDI 0x04) command in S25FL116K flash function.
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Serial NOR
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Hello Baskar,
Thank you for contacting Cypress Community Forum. The Write Disable command resets the Write Enable Latch (WEL) bit in the Status Register to a 0. The Write Disable command is entered by driving CS# low, shifting the instruction code “04h” into the SI pin and then driving CS# high. Note that the WEL bit is automatically reset after Power-up and upon completion of the Write Status Registers, Erase / Program Security Registers, Page Program, Sector Erase, Block Erase and Chip Erase commands. A write disable state occurs upon power-up or after any of the following commands: Write Disable, Page Program, Sector Erase, Block Erase, Chip Erase, Write Status Registers, Erase Security Register and Program Security Register.
Thank you
Regards,
Bushra
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Hello Baskar,
Thank you for contacting Cypress Community Forum. The Write Disable command resets the Write Enable Latch (WEL) bit in the Status Register to a 0. The Write Disable command is entered by driving CS# low, shifting the instruction code “04h” into the SI pin and then driving CS# high. Note that the WEL bit is automatically reset after Power-up and upon completion of the Write Status Registers, Erase / Program Security Registers, Page Program, Sector Erase, Block Erase and Chip Erase commands. A write disable state occurs upon power-up or after any of the following commands: Write Disable, Page Program, Sector Erase, Block Erase, Chip Erase, Write Status Registers, Erase Security Register and Program Security Register.
Thank you
Regards,
Bushra
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Is it necessary to use Write Disable (WRDI 0x04) command in S25FL116K flash function "Explicitly" after every write operation.
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Hello Basker,
No. WEL latch is disabled every write/program. Please refer to section 9.1.4 on the datasheet.
Thank you and have a wonderful weekend
Regards,
Bushra