According to the SD card manual, I have to set Tco and Tsu constrains:--- Quote Start --- Once the core is included in your design, it will be necessary to connect the SD card ports to appropriate pins on the FPGA device. Table 1 shows the ports and their associated pins on the DE-series boards. Finally, it is important to set Tco and Tsu constraints for the SD card ports. Both parameters should be set to not more than 10ns. Should the parameters be omitted during design compilation, it is possible that the core may malfunction. --- Quote End --- Can someone explain how I do this? The interface has 3 data I/O and 1 clock output. Do I constrain just the data pins? Or the clock as well?