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When to use Write Enable Volatile (WRENV) command in Infineon QSPI SEMPER™ Flash – KBA236241

When to use Write Enable Volatile (WRENV) command in Infineon QSPI SEMPER™ Flash – KBA236241

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Community Translation: Infineon製QSPI SEMPER™ FlashでWrite Enable Volatile (WRENV)コマンドを使う時 - KBA236241

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Infineon QSPI SEMPER™ flash devices support the Write Enable (WRENB 06h) command and Write Enable Volatile (WRENV 50h) command.

The WRENB command is required to enable write, program, and erase transactions. The WRENV command is used only with the Write Register (WRREG 01h) command to write the volatile Status and Configuration registers.

The volatile Status and Configuration registers can be modified to change the system configuration and memory protection schemes quickly without waiting for the typical non-volatile bit write cycles or affecting the endurance of the status or configuration non-volatile register bits.

When using the Write Any Register (WRARG 71h) command to modify registers, it takes the register address. Because volatile and non-volatile registers have different addresses, there is no ambiguity. Therefore, the WRARG command always uses the WRENB command, regardless of whether the writing is to a volatile or non-volatile register. The WRENV command does not work for the WRARG command.

When using the Write Register (WRREG 01h) command to modify the Status and Configuration registers, it does not take any address. Therefore, the WRENV command must be used to modify the volatile Status and Configuration registers. This is the only scenario when the WRENV command is used.

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