6.5.1.4 Transmitting Frames

Frames may be written by the SPI host and transmitted if the Configuration Synchronization (SYNC) bit in the OA_CONFIG0 register is set and the MAC transmit circuits are enabled.

  1. Enable transmit in the Network Control register.
  2. Set the Configuration Synchronization (SYNC) bit in the OA_CONFIG0 register.
  3. The SPI host transfers the transmit frame from the host to the MAC via the SPI.
  4. The MAC transmits the frame to the internal PHY as specified by the CSMA/CD algorithm.