Teledyne LeCroy QPHY-SAS2 - Manual (Page 28)

28
917718 Rev A
Figure 18 - OOB Test Results
In the Measure section:

IdleNoise (P1) is the peak-to-peak measurement of F3 (idle differential signal). This is the measured value
for Tx – Max Noise During Idle (5.1.2). This value must be less than 120mV(P-P) in order to pass the
test.

OffsetDelta (P3) is the mean amplitude of F4 (burst differential signal). This is the measured value for
Tx- OOB Offset Delta (5.1.4). This value must be between -25mV and 25mV (inclusive) in order to pass
the test.

BurstAmpl (P4) is the peak-to-peak value of F4 (burst differential signal). This is the measured value for
Tx – Max Burst Amplitude and Tx – Min Burst Amplitude (5.1.3). The maximum value must be less
than 1.6V and the minimum value must be great than 240mV in order to pass this test.

CMMdelta (P7) is the difference between the mean of the Burst Common Mode Signal (F5) and the Idle
Common Mode Signal (F7). This is the measured value for Tx - OOB Common Mode Delta (5.1.5).
This value must be between +/- 50mV in order to pass this test.
Tx Group 2 Spread Spectrum Clocking Tests
There are 3 tests run in this group. The tests that are run are:
1. 5.2.2 - Tx SSC Modulation Frequency
2. 5.2.3 - Tx SSC Modulation Deviation and Balance
3. 5.2.4 - Tx SSC DFDT (Informative)
Each of these 3 tests is run when the device is using Up-spreading, Down-Spreading and Center-Spreading SSC.
The purpose of these tests is to verify the SSC Modulation Frequency, Modulation Deviation and Balance and
DFDT are within the specification limits. After the completion of each of the Spread Spectrum Clocking tests the
oscilloscope is in the following configuration: