Confidential
3-44
The COMMAND signal and STATUS signal are the signals that are used to transfer the data
between the controller and the engine, which perform as a half-duplex asynchronous serial
communication. Refer to Fig.3-40.
Start bit
COMMAND
STATUS
Start bit
Parity bit
Parity bit
Stop bit
Stop bit
8ms (TYP) 30ms (MAX)
LSB
LSB
MSB
MSB
P
P
Fig. 3-40
NOTE:
• Based on “Asynchronous communication” method.
• Command/status communication must keep the “Handshake rule”.
• Baud rate is 9600 bps.
• Frame format: - one (1) start bit,
- eight (8) data bits
(Start bit side is LSB, Parity bit is MSB),
- one (1) odd parity bit,
- one (1) stop bit.
• The video controller has to send an “Initialize command” to the engine controller after power
on in order to establish communication.
The power for the main PCB is supplied through the engine interface connector.
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