Teledyne LeCroy Summit T24 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 69)

Summit T24 PCI Express Multi‐Lane Protocol Analyzer User Manual 57
Link Settings Teledyne LeCroy
5.14.2 Link Width
The Link Width sets the physical width of the link. Select the Link Width or select Auto
(see
Figure 5.1 on page 48 : 3B).
Note:
Selecting Auto in the Link Width drop‐down list will find the correct link width even if the
analyzer does not record a link training sequence and for links that are in low power states.
5.14.3 Upstream and Downstream
Gives you low‐level control over each link direction. The heading for these boxes indicates
the port and/or unit to which the following options are applied based on the current
Analyzer configuration (see
Figure 5.1 on page 48 : 3C and 3D).
 Inhibit Channel: Do not record/upload this channel
 Reverse Lanes: Reverse Lanes: Manual lane reversal. If Swizzling Config is set,
the Reverse Lanes will not work if Auto is checked.
 Invert Polarity
5.14.4 Reference Clock
If the PCI Express link under analysis uses spread‐spectrum clocking, then the Analyzer
must use the external reference clock from the system. If the Device Under Test does not
supply a reference clock, the internal reference clock in the Analyzer module can be used
instead (see
Figure 5.1 on page 48 : 3E). Only the standard PCIe reference clock is
supported.
5.14.5 Disable Descrambling
If checked, causes the Analyzer to assume that none of the PCI Express traffic is
scrambled. By default, the Analyzer determines the scrambling state of the devices under
test (see
Figure 5.1 on page 48 : 3E).
5.14.6 Auto-Configure Lane Polarity
Lets the Analyzer determine lane polarity (see Figure 5.1 on page 48 : 3F). Auto functions
such as Auto Configure polarity rely on Gen1 or Gen2 training sequences to properly
discover their values.
5.14.7 Ignore Idle Errors
When set the analyzer will not store errors in between packets in the memory. This
option helps to preserve analyzer memory to store more packets in cases where memory
efficiency is critical. This option can also be used to filter out Compliance Patterns (see
Figure 5.1 on page 48 : 3G).