Description

When implementing the Virtex-4 Embedded Tri-mode Ethernet MAC Wrapper v4.7 configured for SGMII, tri-speed operation, with the fabric buffer the following error is seen in 11.2 NGDBUILD:

ERROR:ConstraintSystem:58 - Constraint <NET "*RXRECCLK1_0"

TNM_NET = "clk_rec_clk0";> [core_top.ucf(18)]: NET "*RXRECCLK1_0" does not

match any design objects.

Solution

The current constraint in the UCF that causes the failure is:

NET "*RXRECCLK1_#" TNM_NET = "clk_rec_clk#";

TIMESPEC "TS_rec_clk#" = PERIOD "clk_rec_clk#" 7200 ps HIGH 50 %;

To resolve the failure, replace the above ucf constraint with:

NET "*GT11_DUAL_1000X_inst/rxrecclk1_bufr#" TNM_NET = "clk_rec_clk#";

TIMESPEC "TS_rec_clk#" = PERIOD "clk_rec_clk#" 7200 ps HIGH 50 %;

*Note: # is either a 0 or 1 referring to EMAC0 or EMAC1