AN 793: Intel® Arria® 10 DisplayPort 4Kp60 with Video and Image Processing Pipeline Retransmit Reference Design

ID 683020
Date 6/13/2017

DisplayPort IP Core

The reference design uses specific DisplayPort IP core parameter settings.
Table 4.  DisplayPort IP Core Settings for the Reference Design
Parameter Value Notes

Maximum video input color depth (TX) /

Maximum video output color depth (RX)

10 bpc

This reference design supports GPU and monitor up to a maximum of 10 bit-per-color depth.

Maximum link rate

5.4 Gbps

The bandwidth requirement for 4Kp60, 10 bpc video stream through serial link:

Active video resolution = 3840 × 2160 pixels/frame

Total resolution (including reduced blanking) = 4000 × 2222 pixels/frame

Refresh rate = 60 Hz or 60 frames per second

Bits per pixel = 10 bpc × 3 colors = 30 bits per pixel

Total bandwidth = (4000 × 2222) pixel/frame × 60 frame/s × 30 bits/pixel = 15.9984 Gbits/s

With 8b/10b encoding scheme, the actual bandwidth required = 15.9984 × 10/8 = 19.998 Gbps

With 4 lanes at 5.4 Gbps, the aggregated bandwidth of 21.6 Gbps is sufficient to support the 4K video stream at 60 Hz refresh rate.

Maximum lane count


Symbol output mode (Source) /

Symbol input mode (Sink)


Symbol mode affects the transceiver parallel bus width and the DisplayPort IP core clock frequency. The DisplayPort IP core synchronizes with the transceiver parallel clock. The parallel clock frequency is link rate/transceiver parallel bus width.

The table below shows the frequency for HBR2 (5.4 Gbps).
Symbol Mode Transceiver Recovered Clock
Dual (20 bits) 5400/20 = 270 MHz
Quad (40 bits) 5400/40 = 135 MHz

Pixel input mode (Source)/

Pixel output mode (Sink)


Pixel mode affects the video clock frequency and video port width of the IP core.

For 4Kp60 video stream, the bandwidth requirement is 4000 × 2222 × 60 pixel/s = 533280000 pixels/s. Because of the high bandwidth requirement, the design requires dual or quad pixel mode for timing closure.
Pixel Mode Video Clock
Single (1 pixel/clock) 533.28 MHz
Dual (2 pixels/clock) 266.64 MHz
Quad (4 pixels/clock) 133.32 MHz

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