Analog Devices ADV8003 Hardware Manual page 295

tx_frame_length[4:0], TX2 CEC Map, Address 0xF810[4:0]
This signal is used to specify the message size of the CEC message to be transmitted. This is the number of byte in the outgoing message
including the header. The allowable range is 00H to 10H.
Function
tx_frame_length[4:0]
xxxxx
tx_enable, TX2 CEC Map, Address 0xF811[0]
This bit enables the TX section. When set, it initiates the start of transmission of the message in the outgoing message buffer. When the
message transmission is completed this bit is automatically reset to 0. If it is manually set to 0 during a message transmission it may
terminate the transmission depending on what stage of the transmission process has been reached. If the message transmission is still in
the 'signal free time' stage the message transmission will be terminated. If data transmission has begun then the transmission will
continue until the message is fully sent, or until an error condition occurs.
Function
tx_enable
0 
1
The ADV8003 features three status bits related to the transmission of CEC messages. The events that set these bits are mutually exclusive,
that is, only one of the three events can occur during any given message transmission.
• cec_tx_ready_int
•
cec_tx_arbitration_lost_int
• cec_rx_ready_int[2:0]
cec_tx_ready_int, TX2 Main Map, Address 0xF497[5]
This bit is used to readback and control the CEC TX Ready interrupt.
Function
cec_tx_ready_int
0 
1
cec_tx_arbitration_lost_int, TX2 Main Map, Address 0xF497[4]
This bit is used to readback and control the CEC TX Arbitration Lost interrupt.
Function
cec_tx_arbitration_lost
_int
0 
1
cec_tx_retry_timeout_int, TX2 Main Map, Address 0xF497[3]
This bit is used to readback and control the CEC TX Retry Timeout interrupt.
Rev. B, August 2013
Description
Total number of bytes (including header byte) to be sent
Description
Transmission mode disabled
Transmission mode enabled and message transmission started
Description
Interrupt not active
Interrupt active. CEC controller indicating that the TX is ready to send a message
Description
Interrupt not active
Interrupt active. CEC controller is indicating that the TX has lost arbitration
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ADV8003 Hardware Manual