Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Negative Setup Slack time

Hi, I am receiving a negative setup slack time . inst|the_ddr_1|ddr_1_controller_phy_inst|ddr_1_phy_inst|ddr_1_phy_alt_mem_phy_inst|clk|pll|altpll_component|auto_generated|pll1|clk[1] of ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Ok that looks correct. Do you have recovery or removal timing violations in the Timequest report by any chance? Also did you run the .tcl script that is generated by the SDRAM controller? Check to make sure all your I/O are constrained by going into Timequest and running the command "Show all unconstrained I/O".