LogiCORE IP Display Port v1.1 - What are the MAX_LINK_RATE, MAX_LANE_COUNT and other values defined by the VESA Display Port v1.1a specification?

Description

What are the MAX_LINK_RATE, MAX_LANE_COUNT and other values defined by the VESA Display Port v1.1a specification?

Solution

These values are hard coded in the Display Port v1.1 and v1.2.

DPCD_REV
= 'h11 (Dport v1.1a)
MAX_LINK_RATE
= LINK_RATE (fixed to 2.7)
MAX_LANE_COUNT
[7] = 'b1 (we are enhanced frame capable)
[4:0] = LANE_COUNT (set through GUI)
MAX_DOWNSPREAD
                [0] = 'b1
                [6] = 'b0
NORP
                = 'h0 (Based off of whether Secondary support is selected in GUI, which is currently disabled. When enabled, it should read 'b1)
DOWNSTREAMPORT_PRESENT
                = 'h00
MAIN_LINK_CHANNEL_CODING
                = 'h01
DOWN_STREAM_PORT_COUNT
                [3:0] = 'h0
                    [7] = 'b1
RECEIVE_PORT0_CAP_0
                [1] = set by internal reg 0x084
                [2] = 'b0
RECEIVE_PORT0_CAP_1
                = 'd32 (internal buffer size)
RECEIVE_PORT1_CAP_0
                [1] = set by internal reg 0x088
                [2] = 'b1
RECEIVE_PORT1_CAP_1
                = 'd8

Please see (Xilinx Answer 33258) for a detailed list of LogiCORE IP Display Port Release Notes and Known Issues.