Cypress S6J3200 Series Manuallines - Страница 7

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3.7

Signal Assignment to the Connector

When assigning signals to the pins of the connecter, consider the following:

▪

Connectors must have a low skew with matched impedance.

▪

Select connectors with the same lead lengths for a lower skew and crosstalk.

▪

Route the true and complement signals of the same differential pair to adjacent pins of the connector.

▪

If possible, place ground pins between differential pairs.

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End pins of the connectors should preferably be grounded and must not be used for high-speed signals.

▪

Terminate all unused pins of the connector to ground.

Figure 8

shows two examples of signal assignments of the connector. While the signal assignment on the upper

diagram does introduce a mismatch in signal length between the true and complement signals of the differential pair

), if the pin spacing between rows of the connector is small (<3 mm), this should remain below the 5-mm target.

Signal assignment in the lower diagram introduces a small difference in length between differential signals (L

This can be compensated by adjusting the lengths of the signals at the other end of the cable exiting from the

opposite side of the connector.

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