IOSTANDARD for IOBUFDS error

[Shriharsha]

Hello, m working on xps_tft controller. when i try to genarate bitstream, I am getting following error. Can u tell me how to resolve it?



ERROR:LIT:600 - IOBUFDS symbol
"DDR2_SDRAM/DDR2_SDRAM/mpmc_core_0/gen_v5_ddr2_phy.mpmc_phy_if_0/u_phy_io_0/g en_dqs[2].u_iob_dqs/gen_dqs_iob_ddr2.u_iobuf_dqs" (output
signal=DDR2_SDRAM/DDR2_SDRAM/mpmc_core_0/gen_v5_ddr2_phy.mpmc_phy_if_0/u_phy_
io_0/gen_dqs[2].u_iob_dqs/dqs_ibuf) does not have IOSTANDARD specified. Map
is unable to generate a default IOSTANDARD for IOBUFDS, one has to be
explicitly provided.

 

[ads-ee]

The core should have a ucf (constraint) file that has timing, io placement, and io standards. Did you include it in the project?

 

[Shriharsha]

Oh ya... What i did is, i opened data>>system.ucf and deleted everything in that and i wrote my own UCF. Maybe few constraints r left out. . I was supposed to add my written UCF to the previously existing 1. . Thanks for the reply.. I made changes in the UCF. its working now.