7.7.4 PRIME: Send Message (Buffer 0)

In a message transmission, there is only one SPI transaction that includes both parameters and data.

Figure 7-13. PRIME Send Message SPI Array

In the figure above, the following can be seen:

  • Master (MOSI):
    • Send ID memory region(16 bits): 0x0001 (ATPL360_TX0_PARAM_ID)
    • Send SPI command (1 bit): 1 (write command)
    • Send SPI params length (15 bits) (in blocks of 16-bits): (param length + data length) / 2, where param length is 12 bytes
    • Send configuration parameters of PRIME transmission (12 bytes)
    • Send data part of message (variable)
  • Slave (MISO): PL360 responds with Firmware Header (0x1122)

IRQ is not used in this request operation.