Analog Devices ADV8003, Руководство по оборудованию

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ADV8003 Hardware Manual
Rev. B, August 2013 305
7.6. LOW POWER CEC MESSAGE MONITORING
The ADV8003 can be programmed to monitor the CEC line for messages which contain specific, user-programmable opcodes. These are
referred to as “wake_opcodes” as they allow the system to go into a low power or sleep mode and be woken up when an opcode of interest
is received without the host processor having to check each received message.
The default values of the wake_opcode registers are detailed below. All of these registers can be overwritten as required by the host
processor.
For each of the eight wake_opcode registers there is a corresponding raw flag, a status bit and a clear bit. If one of the wake_opcodes is
received, the corresponding raw flag will go high for a brief period of time. If the appropriate interrupt mask bit is set, the status bit will go
high and remain high until cleared by the clear bit, and an interrupt will also be generated.
wake_opcode0[7:0] , TX2 CEC Map, Address 0xF877[7:0]
This register is used to specify the CEC_WAKE_OPCODE0. This value can be set to a CEC opcode that requires a response. On receipt
of this opcode the Rx generates an interrupt that can be used to alert the system that a CEC opcode of interest has been received and
requires a response.
Function
wake_opcode0[7:0] Description
01101101  Power on
xxxxxxxx User specified OPCODE to respond to
wake_opcode1[7:0] , TX2 CEC Map, Address 0xF878[7:0]
This register is used to specify the CEC_WAKE_OPCODE1. This value can be set to a CEC opcode that requires a response. On receipt
of this opcode the Rx generates an interrupt that can be used to alert the system that a CEC opcode of interest has been received and
requires a response.
Function
wake_opcode1[7:0] Description
10001111  Give power status
xxxxxxxx User specified OPCODE to respond to
wake_opcode2[7:0]
, TX2 CEC Map, Address 0xF879[7:0]
This register is used to specify the CEC_WAKE_OPCODE2. This value can be set to a CEC opcode that requires a response. On receipt
of this opcode the Rx generates an interrupt that can be used to alert the system that a CEC opcode of interest has been received and
requires a response.
Function
wake_opcode2[7:0] Description
10000010  Active source
xxxxxxxx User specified OPCODE to respond to
wake_opcode3[7:0] , TX2 CEC Map, Address 0xF87A[7:0]
This register is used to specify the CEC_WAKE_OPCODE3. This value can be set to a CEC opcode that requires a response. On receipt
of this opcode the Rx generates an interrupt that can be used to alert the system that a CEC opcode of interest has been received and
requires a response.