Slot Connector vs. Mid-Bus Pad
The PCI Express bus can also be used for chip-to-chip connections. In this case, there are no connectors for the analyzer to plug into. This requires a mid-bus probing technique.
The mid-bus probing does not allow for bus exercising since the bus stubs can create signal integrity issues. Developers wanting to characterize their products by fully exercising it should design a development card that includes their device and plug it into the Exerciser for characterization and verification.
Figure A-15 on page 978 illustrates one recommended interface to help developers and tool vendors to provide a common interface for analysis. However, this interface design is not part of the specifications and is intended only for ...
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