After using BSB System Build on Spartan-6 device, I cannot see any constraints for the MCB pins.
Is it going to beauto-constrainted by XPS? Can we modify some of the pins such as RZQ or ZIO?
It is not necessary to set the IOSTANDARD or pin LOC constraints in the system UCF for the FPGA pins connected to the memory device. This information is obtained automatically from the value of C_MCB_LOC and the underlying MIG tool when PlatGen is run to set the values in a core level UCF file located at: <EDK Project Direc-tory>/implementation/<core instance name>_wrapper/<core instance name>_wrapper.ucf.
Any of these core level constraints can be overridden by the system level system.ucf.
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