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PI3DPX1202A

Document number: DS40115 Rev.2-1

4.4

DisplayPort AUX Listener

DP AUX listener supports Native AUX CH Syntax. Mapping of SMBus onto AUX CH Syntax is not supported.

AUX listener monitor AUX communication from requester and replier for transactions and stored AUX communication ,

related to the link settings.

In AUX read/write request cycle, the AUX address compares with the following registers’ address. When the addresses

matches, data shall extract and store into the respective AUX Listener registers. Below registers will set during the link train-

ing sequence after the hot plug detection.

00100h Data Rate Register

00101h LANE_COUNT_SET

00103h - 00106h TRAINING_LANE0/1/2/3_SET

00260h Sink Test request response

00600h Power Down

The AUX listener supports Sink request Test sequence. After HPD IRQ event and DP source read 00201h AUX register and

if bit 1 is high, the DP source will enter a Sink request test mode and initiate a sequence of AUX read request cycle. During

the read cycle, data matching the following registers address are stored in the listener.

00206h ADJUST_REQUEST_LANE0_1

00207h ADJUST_REQUEST_LANE2_3

00218h Test Request

00219h Test link rate

00220h Test Lane count

After the read request cycle, the DP source will write 1 to Bit 0 register 00260h if the DP source enters sink request mode,

or 1 to Bit 1 of register 00260h if the source declined the sink test request. The data stored in registers 002xx above will

override the value set in 00101h to 00106h registers when the sink entered the Sink Test mode.

Table 4-11: Sink Test Request Acknowledgement

Table 4-12:

00260h

Mode

Buffer configuration outputs

xxxxxx00b

No action

00100 : 00106h

xxxxxx01b

Sink Test mode

00206h,00207h,00219h,00220h Override 00100,1,3,4,5,6h register settings

xxxxxx10b

Sink test mode declined 00100h : 00106h

xxxxxx11b

Not Legal code

00100h : 00106h