For the Stratix® V device family, to ensure consistent behavior between the Avalon®-MM and Avalon-ST PCI Express® Hard IP, 3 parameters need to be changed from the Avalon-MM wrapper to match the default values in the Avalon-ST wrapper.
In the file altpcie_sv_hip_avmm_hwtcl.v, look for the following parameter definitions near the top of the file (around line 37 and 148) and make the changes identified:
parameter deskew_comma_hwtcl = "skp_eieos_deskw",
parameter rx_cdc_almost_full_hwtcl = 6,
parameter tx_cdc_almost_full_hwtcl = 6,
Change to:
parameter deskew_comma_hwtcl = "com_deskw",
parameter rx_cdc_almost_full_hwtcl = 12,
parameter tx_cdc_almost_full_hwtcl = 11,