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AR# 13843

LogiCORE SPI-4.2 (POS-PHY L4) v3.x - When I attempt to read data from the Sink FIFO, I see dropped packets/missing EOPs/SnkFFErrs

Description

General Description:

The PL4 core appears to be operating correctly at the PL4 interface, however, when I attempt to read data out of the Sink FIFO in the receiver, I observe the following:

- Dropped Packets

- Missing EOPs

- SnkFFErrs

Solution

Although this is not an error in the core, you can resolve this problem by monitoring the SnkFFPae_n flag.

Enable the read enable signal one clock cycle after SnkFFPae_n is asserted. (Not on the same clock cycle, or on two or more clock cycles after it.)

Be sure to monitor the SnkFFPae_n flag to determine when to assert the read, and monitor SnkFFEf_n further to determine when to de-assert the read.

AR# 13843
Date Created 08/29/2007
Last Updated 05/03/2010
Status Archive
Type General Article