Altera DisplayPort MegaCore Function Instrukcja Użytkownika Strona 142

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For transaction replies:
1. Issue a transaction request.
2. Wait for MSG_READY to be 1. Implement a timeout.
3. Read the transaction reply’s total length from LENGTH.
4. Read the transaction reply's command from the DPTX_AUX_COMMAND register. This transaction clears
MSG_READY and LENGTH.
5. Read the transaction reply's data payload from registers DPTX_AUX_BYTE0 to DPTX_AUX_BYTE15 (read
LENGTH - 1 bytes).
Address: 0×0100
Direction: RW
Reset: 0×00000000
Table 9-39: DPTX_AUX_CONTROL Bits
Bit Bit Name Function
31
MSG_READY
0 = Waiting for a reply
1 = A reply has been completely received
30
READY_TO_TX
0 = Busy sending a request or waiting for a reply
1 = Ready to send a request
29:5 Unused
4:0
LENGTH
For the next transaction request, total length of message to
be transmitted (3 – 20), for the last received transaction
reply, total length of message received (1 – 17).
DPTX_AUX_CMD
Address: 0×0101
Direction: RW
Reset: 0×00000000
Table 9-40: DPTX_AUX_CMD Bits
Bit Bit Name Function
31:8 Unused
7:0
COMMAND
AUX transaction command for the next request or
received in the most recent reply (refer to the Display‐
Port specification for details). Reading of this register
clears MSG_READY and LENGTH in DPTX_AUX_CONTROL
register.
UG-01131
2015.05.04
DPTX_AUX_CMD
9-21
DisplayPort Source Register Map and DPCD Locations
Altera Corporation
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