DisplayPort Intel® FPGA IP User Guide

ID 683273
Date 1/24/2022
Public

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4.3.1.1. Clock Recovery Core Parameters

You can use these parameters to configure the clock recovery core.
Table 14.  Clock Recovery Core Parameters
Parameter Default Value Description
SYMBOLS_PER_CLOCK 4 Specifies the configuration of the DisplayPort RX transceiver used.

Set to 2 for 20-bit mode (Dual symbol) or to 4 for 40-bit mode (Quad symbol).

CLK_PERIOD_NS 10 Specifies the period (in nanoseconds) of the control clock input signal connected to the port.
Note: The recommended control clock frequency is 60 MHz. Set this parameter to 17.
DEVICE_FAMILY Arria V Identifies the device used. The values are Arria V, Cyclone V, and Stratix V.
FIXED_NVID 0 Specifies the configuration of the DisplayPort RX received video clocking used.

Set to 1 for asynchronous clocking, where the Nvid value is fixed to 32’h8000.

Set to 0 if the value of Nvid is a variable of 32'h8000 or any other value.

Note: Most DisplayPort source devices transmit video using asynchronous clocking. For optimized resource usage, Intel recommends you to set the FIXED_NVID parameter to 1.
PIXELS_PER_CLOCK 4 Specifies how many pixels in parallel (for each clock cycle) are gathered from the DisplayPort RX.

Set to 1 for single pixel, 2 for dual, or 4 for quad pixels per clock cycle.

BPP 48 Specifies the width (in bits) of a single pixel.

Set to 18 for 6-bit color, 24 for 8-bit color, and so on up to 48 for 16-bit color.