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T H E
R E F E R E N C E
D E S I G N
(signal-to-ground) transmission lines. Signals can be used as single-ended also. Proper electrical
levels are explained in the VCCO section.
No length-matching is done on the PCB for daughter card signals, (except between two ends of
a differential pair). However, the Virtex-5 is capable of variable-delay input or output using the
built-in IDELAY or ODELAY modules. A signal delay report is available
A signal delay table (in ps and taps, assuming calibration at 200MHz) is available on request.
Contact [email protected]
22.2.1 Pin assignments
The pin out of the DN9000K10 expansion system was designed to reduce cross talk to
manageable levels while operating at full speed of the Virtex-5. The ground to signal ratio of the
connector is 1:1. General purpose IO is arranged in a GSGS pattern to allow high speed singleended or differential use. On the DN9000K10 (host), these signals are routed as loosely-coupled
differential signals, meaning when used differentially, they benefit from the noise-resistant
properties of a differential pair, but when used single-ended-ly, do not interfere with each other
excessively.
DN9000K10 User Guide
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