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Virtex-5 FPGA ML561 User Guide www.xilinx.com 49
UG199 (v1.2) April 19, 2008
Termination and Transmission Line Summaries
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Table 5-4: QDRII SRAM Terminations
Signal FPGA Driver Termination at FPGA Termination at Memory
Write Data (D) HSTL_I_18 No termination 50Ω pull-up to 0.9V
Read Data (Q) HSTL_I_DCI_18 No termination No termination
Write Strobe (K, K
) HSTL_I_18 No termination 50Ω pull-up to 0.9V
Read Strobe (CQ, CQ
) HSTL_I_DCI_18 No termination No termination
Clock (CK, CK
) HSTL_I_18 No termination 100Ω differential termination
between pair
Address (A, BA) HSTL_I_18 No termination 50Ω pull-up to 0.9V after the last
component
Control (RAS
, CAS, WE,
CS
, CKE, and BW)
HSTL_I_18 No termination 50Ω pull-up to 0.9V after the last
component
Table 5-5: RLDRAM II Terminations
Signal FPGA Driver Termination at FPGA Termination at Memory
Data (DQ for CIO) HSTL_II_DCI_18 No termination 50Ω pull-up to 0.9V
Data (Q for SIO) HSTL_I_DCI_18 No termination No termination
Write Data (D for SIO) HSTL_I_18 No termination 50Ω pull-up to 0.9V
Write Strobe (DK, DK
) DIFF_HSTL_I_18 No termination 100Ω differential termination
between pair
Read Strobe (QK, QK
) DIFF_HSTL_II_DCI_18 (for CIO)
DIFF_HSTL_I_DCI_18 (for SIO)
No termination No termination
Data Valid (QVLD) HSTL_II_DCI_18 (for CIO)
HSTL_I_DCI_18 (for SIO)
No termination No termination
Clock (CK, CK
) DIFF_HSTL_I_18 No termination 100Ω differential termination
between pair
Address (A, BA) HSTL_I_18 No termination 50Ω pull-up to 0.9V after the last
component
Control (RAS
, CAS, WE,
CS
, and CKE)
HSTL_I_18 No termination 50Ω pull-up to 0.9V after the last
component