Teledyne LeCroy Summit T28 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 64)

Teledyne LeCroy Buffer Size
52 Summit T28 PCI Express Multi‐Lane Protocol Analyzer User Manual
5.7.1 Snapshot
A recording of a pre‐determined length. You set the recording length in the Buffer Size
box. Recording begins when you click the Rec button on the toolbar and ends when the
selected buffer size is filled or when you press the Stop button.
5.7.2 Manual Trigger
A recording that switches between the pre‐trigger buffer and the post‐trigger buffer
when a Trigger is received. Recording begins when you select Start in the application.
Recording continues until the post‐trigger buffer has been filled. You can also end the
recording by pressing the Stop button in the application.
5.7.3 Event Trigger
A recording that switches between the pre‐trigger buffer and the post‐trigger buffer
when it is triggered by an event in the CATC Trace. An Event Trigger begins when you
select Start in the application and ends when the specified triggering event occurs in the
CATC Trace or you press Stop. If an event triggers the end of the recording, the Analyzer
records a predefined amount of post‐trigger data (specified by Trigger Position and Buffer
Size.)
You can also terminate an Event Trigger recording by pressing the Manual Trigger button
on the front of the Analyzer. When the Manual Trigger button is pressed, the Analyzer
continues to record until the specified post‐trigger buffer has been filled.
5.8 Buffer Size
The Buffer Size allows the Analyzer to record traffic to its buffer and then upload the
CATC Trace to the host machine. Recordings are limited in size to the size of the Analyzer's
buffer, see Figure 5.1: 2B (2 GB per direction, Upstream and Downstream).
The Buffer Size slide‐bar allows you to set the size of the recording buffer.
Figure 5.4: Buffer Size Slide Bar
The size selection is per direction. For example, selecting 32 MB creates two memory
areas of that size.
After you have set the Buffer Size, you must set the Recording type and Trigger position
options. These options determine how the buffer is used.
Note: The Buffer Size slide‐bar does not precisely portray the buffer size because of the way the
packets are stored in the Analyzer’s memory.