Teledyne-lecroy QPHY-SATA Manuel d'utilisateur télécharger pdf (Page 28)

28 915745 Rev G

Figure 10. Screenshot of an SSCTrack for a product with SSC enabled

In the previous screen shot, the center of the grid is at 3GHz and the SSC deviation is down spread as required.

PHY Transmitted Signal Requirements

The PHY Transmitted Signal requirements (TSG) group of tests includes parameters from Table 31 in the SATA

specification, revision 3.0. There are a total of 12 tests defined in this group.

TSG-01 – Differential Output Voltage

This test measures the differential output voltage of the transmitter for products running at 1.5Gb/s or 3.0Gb/s.

The minimum and maximum are tested differently. A persistence map is built from the differential waveform for

both measurements. For VDiffMin, the HFTP, MFTP, and LBP patterns are used. Persistence histograms are

accumulated over the center of the UI using a slice width of 1/10 of the UI for the high and low levels. Then the

mean of histograms are used to compute the differential output voltage. The screenshot below shows the VDiffMin

measurement using LBP. P1 is the mean of the histogram for the upper level. P2 is the mean of the histogram for

the lower level. P3 is the difference between the two voltages.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 44 45

Pas de commentaire

Teledyne-lecroy QPHY-SATA Manuel d'utilisateur Page 28