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AR# 23022

LogiCORE SPI-4.2 (POS-PHY L4) v7.3 - Sink core never goes in frame (SnkOof =1), and DIP4 error occurs

Description

The SPI-4.2 User Guide states that the Sink core must be receiving a valid training pattern when the PhaseAlignRequest is asserted. However, the Sink core must be receiving a valid training pattern at the time Reset_n is deasserted.

Solution

If the valid training pattern is not available when reset_n has been released, the Sink core can get stuck in an unknown state and will issue DIP4 errors. 

 

To work around this issue, do not deassert Reset_n until a valid training pattern is available on RDAT. The required startup sequence has been updated to reflect the new requirement. See (Xilinx Answer 16176).

AR# 23022
Date Created 09/04/2007
Last Updated 05/20/2014
Status Archive
Type General Article