Teledyne LeCroy Summit T3-8 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 73)

Summit T3‐8 PCI Express Multi‐Lane Protocol Analyzer User Manual 61
Link Settings Teledyne LeCroy
5.14.1 Speed
The Speed can be set at Auto, 8.0 GT/s, 5.0 GT/s, or 2.5 GT/s from the drop‐down menu.
The default is Auto. (See
Figure 5.1 on page 52: 3A. )
Auto: When set to Auto, the hardware auto‐determines the speed.
8.0 GT/s, 5.0 GT/s, or 2.5 GT/s: When set to a specific speed Teledyne LeCroy’s software
forces the hardware to record at that speed.
For Auto speed setting to work the polarity setting of lane 0 has to be correct. The
polarity can be set manually if the link is already in L0 state, or, for automatic polarity
detection, the bus has to go through a training sequence so the analyzer can track the
polarity.
Note: For certain build configurations 5.0 GT/s8.0 GT/s and raw recording speed is disabled.
Note: Selecting Auto in the Speed drop‐down list will set the correct speed even if the analyzer does
not record a link training sequence.
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 52: 3B. ) In Cascading mode, multisegmented trace files buffer size
force checks for link widths are described below (see “Viewing Multisegmented Files” on
page 60 ).
 Multisegmented is forced when the buffer size exceeds 1GB for link width set to
auto or x16.
 Multisegmented is forced when the buffer size exceeds 2GB for link width set to
X8.
 No force check for Multisegmented regardless of the buffer size for link width set
to X4, X2, or X1.
Note: When selecting Auto in the Speed drop‐down list the embedded software is able to find the
correct speed even if the link does not go through a training sequence.
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 52 : 3C and 3D . )
 Inhibit Channel: Do not record/upload this channel
 Reverse Lanes: Manual lane reversal. If Auto‐Configure Lane Swizzle is set, the
Reverse Lanes option will be ignored.
 Invert Polarity