AR# 64562

HDMI Receiver (RX) Subsystem and HDMI Transmitter (TX) Subsystem - Why is the output always 12 bits per pixel in YUV 422 (YCrCb 4:2:2) mode?

Description

In LogiCORE HDMI, why is the output always 12 bits per pixel in YUV 422 (YCrCb 4:2:2) mode?

Solution

According to the HDMI 1.4b and later specification, YUV422 (YCrCb 4:2:2) should always be 12-bits.

However it does allow for the use of fewer bits. If fewer than 12-bits are used, the data is still sent in 12-bit format, but just padded on the LSBs.

See the HDMI 1.4b Specification Section 6.5.1 Pixel Encodings for more details.

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AR# 64562
Date 04/27/2018
Status Active
Type General Article
IP