DCI termination mismatch error reported in ise91

Hi : i am using ise 9.1i to run my designs which containted lvds . In my ucf file , there are constrains like NET "Ring_In_P[47]" IOSTANDARD = LVDS_25_DCI; but later on in phase of map of ise , it reported the following error:

Phase 7.5 ERROR:Place:865 - Incompatible IOB's are range constrained to the same bank 2 Conflicting IO Standards are: IO Standard 1: Name = LVDS_25_DCI, VREF = NR, VCCO = 2.50, TERM = SPLIT List of range constrained IOB's: Ring_In_P[0] Ring_In_N[0] ......... IO Standard 2: Name = LVDS_25_DCI, VREF = NR, VCCO = 2.50, TERM = SPLIT List of range constrained IOB's: Ring_In_P[11] Ring_In_N[11] Ring_In_P[30] ............. These IO Standards are incompatible due to DCI termination mismatch.

But how should i fix it ?btw, if i use ise8.1, no such a problem . It seemed to be ise91's bug? Any help would be appreciated !

mini_monkey

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mini_monkey
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