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60 www.xilinx.com Virtex-5 FPGA ML561 User Guide
UG199 (v1.2) April 19, 2008
Chapter 7: ML561 Hardware-Simulation Correlation
R
DDR2 DQ is a bidirectional signal. To perform hardware measurements for a Write
operation that is not interrupted by a Read response or a Refresh operation, the testbench
on FPGA1 is controlled by DIP switches (SW2) as indicated in Table 7-3.
Table 7-3: DIP[1:2] Settings
Setting Description
2’b00 or 2’b11 Normal alternating Write/Read sequence
2’b01 Write only, Refresh disabled
2’b10 Write once, then Read only, Refresh disabled