It seems to me, the NGDBuild can't differentiate two XCF constraints which are brought in by the NGC files...
I put a clock period of 14.58ns in XCF for XST synthesis. Then I put a UCF constraint of 23.085ns for partially P&R on two sides of my XC2V6000...When I started to assemble them, the NGDBuild gave me this error:
ERROR:XdmHelpers:682 - Second definition of specification "TS_clk_in" found: first definition: PERIOD:clk_in:14580.000000:pS:HIGH:50.000000% second definition: PERIOD "clk_in" 14580.000000 pS HIGH 50.000000 % WARNING:XdmHelpers:681 - UCF definition of specification "TS_clk_in" overrides the definition found in the netlist or NCF file: UCF: PERIOD "clk_in" 23085.000000 pS HIGH 50.000000 % netlist/NCF: PERIOD:clk_in:14580.000000:pS:HIGH:50.000000%
How may I handle this sort of awkward situation?
Kelvin