- Read the DPCD capabilities fields out of the sink device (0x00000 to 0x0000B) though the AUX channel.
- Determine values for lane count, link speed, enhanced framing mode, downspread control and main link channel code based on the capability and needs of each link partner.
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Write the configuration parameters to the link
configuration field (0x00100 to 0x00101) of the DPCD through the AUX channel.
Note: The DPCD capability fields of some sink devices are unreliable. Many source devices start with the maximum transmitter capabilities and scale back as necessary to find a configuration that the sink device can handle. This might be an advisable strategy, instead of relying on DPCD values.
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Equivalently, write the appropriate values to the local
configuration space of the Source core.
- LANE_COUNT_SET
- LINK_BW_SET
- ENHANCED_FRAME_EN
- PHY_CLOCK_SELECT