Teledyne-lecroy QPHY-SATA Manuel d'utilisateur télécharger pdf (Page 31)

QPHY-SATA Software Option

915745 Rev G 31

TSG-02 – Rise/Fall Times

This test measures the differential rise and fall times for the transmitted signal. The 20% and 80% levels are used.

This test is only tested against the limits for the LFTP pattern. Results for HFTP are also reported for informational

purposes. Previously, HFTP was normative and LFTP was informative, but it was changed in the SATA

specification revision 3.0.

TSG-03 – Differential Skew

This test measures the skew between TX+ and TX-. This measurement is made by finding the mean skew (at the

50% level) from the TX+ rising edge to the TX- falling edge and mean skew of the TX- falling edge to the TX+

rising edge. The absolute values of the two means are then averaged together. This test is measured on the

HFTP and MFTP patterns.

TSG-04 – AC Common Mode Voltage

This test measure the AC Common Mode Voltage. A low-pass filter at half the bitrate is applied to the (TX+ - TX-) /

2. Then the peak to peak voltage is measured. This measurement is made using the MFTP pattern and only for

products running at 3.0Gb/s.

TSG-05 – Rise/Fall Imbalance (Obsolete)

Note: This test was made obsolete by the SATA-IO. It can still be run, but it is not enabled by default. This test

measures the imbalance of rise to fall times for the differential pair. It is measured for HFTP, MFTP and LFTP

patterns and only for products running at 3.0Gb/s. The single-ended rise and fall times are reported for

informational purposes. The rise/fall imbalance is computed as follows:

Abs(Mean TX+ rise – Mean TX- fall) / average(MeanTX + rise, Mean TX- fall) * 100%

Abs(Mean TX+ fall – Mean TX- rise) / average(MeanTX + fall, Mean TX- rise) * 100%

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Teledyne-lecroy QPHY-SATA Manuel d'utilisateur Page 31