Xilinx Spartan-3E - UCF Location Constraints

106 www.xilinx.com Spartan-3E Starter Kit Board User Guide
UG230 (v1.0) March 9, 2006
Chapter 13: DDR SDRAM
R
UCF Location Constraints
Address
Figure 13-2 provides the User Constraint File (UCF) constraints for the DDR SDRAM
address pins, including the I/O pin assignment and the I/O standard used.
Data
Figure 13-3 provides the User Constraint File (UCF) constraints for the DDR SDRAM data
pins, including the I/O pin assignment and I/O standard used.
Figure 13-2: UCF Location Constraints for DDR SDRAM Address Inputs
NET "SD_A<12>" LOC = "P2" | IOSTANDARD = SSTL2_I ;
NET "SD_A<11>" LOC = "N5" | IOSTANDARD = SSTL2_I ;
NET "SD_A<10>" LOC = "T2" | IOSTANDARD = SSTL2_I ;
NET "SD_A<9>" LOC = "N4" | IOSTANDARD = SSTL2_I ;
NET "SD_A<8>" LOC = "H2" | IOSTANDARD = SSTL2_I ;
NET "SD_A<7>" LOC = "H1" | IOSTANDARD = SSTL2_I ;
NET "SD_A<6>" LOC = "H3" | IOSTANDARD = SSTL2_I ;
NET "SD_A<5>" LOC = "H4" | IOSTANDARD = SSTL2_I ;
NET "SD_A<4>" LOC = "F4" | IOSTANDARD = SSTL2_I ;
NET "SD_A<3>" LOC = "P1" | IOSTANDARD = SSTL2_I ;
NET "SD_A<2>" LOC = "R2" | IOSTANDARD = SSTL2_I ;
NET "SD_A<1>" LOC = "R3" | IOSTANDARD = SSTL2_I ;
NET "SD_A<0>" LOC = "T1" | IOSTANDARD = SSTL2_I ;
Figure 13-3: UCF Location Constraints for DDR SDRAM Data I/Os
NET "SD_DQ<15>" LOC = "H5" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<14>" LOC = "H6" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<13>" LOC = "G5" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<12>" LOC = "G6" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<11>" LOC = "F2" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<10>" LOC = "F1" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<9>" LOC = "E1" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<8>" LOC = "E2" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<7>" LOC = "M6" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<6>" LOC = "M5" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<5>" LOC = "M4" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<4>" LOC = "M3" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<3>" LOC = "L4" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<2>" LOC = "L3" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<1>" LOC = "L1" | IOSTANDARD = SSTL2_I ;
NET "SD_DQ<0>" LOC = "L2" | IOSTANDARD = SSTL2_I ;