Honored Contributor
Honored Contributorbtw, while the CDMA example code does assert cpl_err[0] in altpcierd_cdma_app_icm.vhd, it does not touch the issue of complete recovery. This would include, not limited to, tag recycling for timeouts as well as graceful termination of outstanding requests in altpcierd_read_dma_requester.vhd and altpcierd_dma_descriptor.vhd.
As far as I understand the PCIe Spec, a design may declare a completion timeout only as correctable by asserting cpl_err[0], if it is a Correctable Error. Quote from Clause 6.2.2.1.: […]If recovery action is indeed needed, the recovery agent must report the error as uncorrectable if the recovery agent decides not to attempt recovery.[…] Seeing CDMA is not attempting recovery, it should report the error by asserting cpl_err[1] instead of cpl_err[0], indicating an uncorrectable error. Additionally, I wonder why Altera did not implement recovery for Completion Timeouts as the code looks as if an attempt was made to fully implement PCIe.
