SPI flash instruction format
cmd_en | Enable sending of command |
addr_len | Number of address bytes (0 to 4) |
pad_cnt | Number of dummy cycles |
cmd_proto | Protocol for transmitting command |
addr_proto | Protocol for transmitting address and padding |
data_proto | Protocol for receiving data bytes |
cmd_code | Value of command byte |
pad_code | First 8 bits to transmit during dummy cycles |