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H A R D W A R E
Like mating, a connector pair can be unmated by pulling them straight apart. However, it requires less
effort to un-mate if the force is originated from one of the slot/key ends of the assembly. (Reverse
procedure from mating) Mating or un-mating of the connector by rolling in a direction perpendicular to
alignment slots/keys may cause damage to the terminal contacts and is not recommended.
25.2
Daughter Card Electrical
The daughter card pin out and routing were designed to allow use of the Virtex 5’s 1 Gbps
general purpose IO. All signals on the DN9002K10PCI are all routed as differential, 50-Ohm
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), because the Virtex 5 is capable of variable-delay input or output using the
built-in IDELAY or ODELAY modules.
25.2.1
Pin assignments
The pin out of the DN9002K10PCI 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 single-
ended or differential use. On the DN9002K10PCI (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.
All high-speed signals on the DN9002K10PCI, including daughter card signals, are routed
against a ground potential reference plane. When creating a daughter card, it is recommended
that these signals remain against a ground plane to maintain trace impedance.
The central columns of the connector pin out use a closely coupled, differential pair pin
arrangement, which is uniformly surrounded by ground pins.
Below is a graphic representation of the pin assignments for the 400-pin connectors. Note that
this is a view from the backside of the connector. The green boxes represent ground
connections.
DN9002K10PCI User Guide
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