AR# 69931

描述

When implementing the MIPI D-PHY v3.1 IP (Rev. 1) (Transmitter side) for 7 Series with the OBUFTDS option enabled, why do we observe that the HS-PREPARE length can violate the MIPI D-PHY specification rev1.1?

For example:

The MIPI D-PHY 4lane@600Mbps with the OBUFTDS option enabled will have HS_PREPARE of approximately 150ns. (out-of-spec)

(According to the MIPI D-PHY specification, the HS_PREPARE max value is 85ns+6UI)

This issue occurs in the MIPI D-PHY (Transmitter side) for 7 Series generated from:

• Vivado 2017.1 - LogiCORE IP MIPI D-PHY v3.1
• Vivado 2017.2 - LogiCORE IP MIPI D-PHY v3.1 (Rev. 1)

解决方案

This issue occurs in the MIPI D-PHY for 7 Series, but only when generated with the OBUFTDS option enabled for the MIPI D-PHY TX configuration.

• Vivado 2017.1 - Users should update to Vivado 2017.4 (On its release) or later.
• Vivado 2017.2 - Users can download the MIPI D-PHY patch from (Xilinx Answer 69760) to work around this issue.
• Vivado 2017.3 - Users should update to Vivado 2017.4 (On its release) or later.
• Vivado 2017.4 - This issue will be resolved in the MIPI D-PHY in Vivado 2017.4 and later.

Users should update to the latest version of the IP.

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