Abstract :
TxEthMAC implements CSMA/CD protocol when transmitting packets of data. Before transmitting packets of data, TxEthMAC must assure that medium is idle and then monitors medium continuously if there is a collision in the middle of transmit process. If collision happened, TxEthMAC makes backoff operation and retries to transmit after a random period depends on number of collision attempt. The transmit process can be aborted or dropped according to the some defined set of rules.