AR# 42882: SPI-4.2 v10.4 - Timing errors encountered when using the 128-bit client interface
SPI-4.2 v10.4 - Timing errors encountered when using the 128-bit client interface
In the SPI 4.2 v10.4 and earlier core, occasionally timing errors can be seen when using the example design constraints and a 128-bit user interface.
The example UCF constraints over-constrains this interface at the full internal core clock rate. Switching all 128-bit user interface clock constraints to be 3/4 of the internal core clock resolves this issue. The UCF constraints have been updated in v10.5 and later of the SPI 4.2 core.