ML365 Virtex-II Pro QDR II SRAM Mem. Board
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33
UG066 (v1.0) June 29, 2004
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Termination and Transmission Line Summaries
R
Chapter 4
Signal Integrity Recommendations and
Simulations
This chapter provides the following information:
•
Summary of the termination schemes for various signals
(refer to
“Termination and Transmission Line Summaries,” page 33
).
•
IBIS simulations and duty cycle measurements (refer to
Termination and Transmission Line Summaries
summarizes the terminations for the three QDR II SRAM components for both
the FPGA and memory.
Table 4-1:
QDR SRAM Terminations
Number
Signal
Drivers at the FPGA
Termination at FPGA
Termination at Memory
1
Data (D)
HSTL_18_C2_DCI
No termination
50 ohm pull-up to 0.9 V
2
Data (Q)
HSTL_18_C1
No termination
No termination
3
Data Strobe (CQ, CQ)
HSTL_18_C2
50 ohm pull-up to 1.3V
50 ohm pull-up to 0.9 V
4
Clock (K, K)
HSTL_18_C2
50 ohm pull-up to 1.3V
No termination
5
Address (A)
HSTL_18_C2
No termination
100 ohm parallel split
termination pull-up to
1.8 V
6
Control (R, W, BW)
HSTL_18_C2
No termination
100 ohm parallel split
termination pull-up to
1.8 V
Product Not Recommended for New Designs