AR# 76255

描述

解决方案

In the MIPI CSI-2 specification, the 16-bit Word Count (WC) field defines the number of 8-bit data words in the Data Payload between the end of the Packet Header and the start of the Packet Footer.

No Packet Header, Packet Footer, or Packet Filler bytes will be included in the WC.

MIPI CSI-2 TX Subsystem users needs to set the WC value correctly for a correct Subsystem operation.

The receiver side uses the WC value to determine the end of the Packet Payload.

Because the MIPI CSI-2 TX Subsystem is transmitting video line-data as a single long packet, WC can be calculated as follows:

• WC = (pixel number per-line) x (bit per-pixel) / 8

Please see the following WC calculation examples for different cases:

a) 1000 pixel, RAW8:

• WC=1000 pixel x 8 bit /8 = 1000 bytes = 0x03E8

b) 1000 pixel, RAW10:

• WC=1000 pixel x 10 bit /8 = 1250 bytes = 0x04E2

c) 1000 pixel, RAW12:

• WC=1000 pixel x 12 bit /8 = 1500 bytes =  0x05DC

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