Teledyne LeCroy QPHY-SAS2 - Manual (Page 44)

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917718 Rev A
Alternately, we clearly could have not inverted C3 and instead selected the Skew clock 2 tab in the P1 parameter
menu and set the oscilloscope to look for negative edges on the second input (C3). However, it is somewhat
agreed that the previous procedure looks much more aesthetically pleasing from the display as it shows C2 and
C3 with the same polarity
Figure 42 - The Skew parameter right side dialog, Skew clock 2 tab, showing default setup
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File name conventions for saved waveform data
When live tests are made, the acquired waveforms are stored using these file names. If there is data which has
been already acquired, to perform tests using this package, the files must be renamed to conform to these
conventions: Please note (at this time) there is no distinction between bit rates, so please use different folders for
results at 6, 3 and 1.5 Gbps.
These files have semi-rigid record length (time duration) requirements for performing the needed tests (shown in
table below)
Test Signal Type Tx+ Tx- Recommended Record
duration
Out of Band or COMINIT OOB_p OOB_n 1 microsecond (or
100ns/div)
Compliance Jitter Test
Pattern CJTPAT_p CJTPAT_p 100 microseconds (or
10usec/div)
High Frequency Test
Pattern (10101010…) HFTP_p HFTP_n 500 microseconds (or
50us/div)
High Frequency Test
Pattern (10101010…) with
SSC down-spreading HFTP-SSC-DOWN_p HFTP-SSC-DOWN_n 500 microseconds (or
50us/div)
High Frequency Test
Pattern (10101010…) with HFTP-SSC-CENTER_p HFTP-SSC-CENTER_n 500 microseconds (or
50us/div)