Spmi Interface |best|

| Component | Bits | Description | | :--- | :--- | :--- | | | - | Master pulls SDATA low while SCLK is high. | | Slave ID | 4 bits | The target slave address (0000 to 1111). | | Opcode | 8 bits | The command (e.g., Ext_Write ). | | Address | 16 bits | The specific register address inside the slave. | | Data | Variable | The actual payload bytes to write. | | Stop | - | End of transmission. |