Waveform path, Specific to “test7-2: tmds-vl” group, Number of segments acquired in sequence – Teledyne LeCroy QPHY-HDMI User Manual
Page 28: Recalled waveform file index (5 digits), Support of tmds frequency >= 165 mhz, Specific to “test7-4: tmds trise, tfall” group, Use internal peak if signal has two peaks, Specific to “test7-6: tmds inter-pair skew” group, Data-data test combinations
W
AVEFORM
P
ATH
Specify the path on the oscilloscope to save/recall waveforms. When not in Demo Mode and
Save acquired waveforms is enabled, the waveforms will be saved in this folder. When set to
Demo Mode or Use stored trace for pixel clock measure, saved waveforms should be available
in this folder. Default is "D:\Waveforms\HDMI".
Specific to “Test7-2: TMDS-VL” Group
N
UMBER OF SEGMENTS ACQUIRED IN SEQUENCE
HDMI specification requires 10'000 segments. For debugging only, reduce the number of
segments to speed-up processing. Choose between 10’000, 1000, 500 or 50. Default is 10’000.
R
ECALLED
W
AVEFORM
F
ILE
I
NDEX
(5
DIGITS
)
Enter the 5 digits number corresponding to the index of the file you want to recall. Default is
00000.
S
UPPORT OF
TMDS
FREQUENCY
>=
165
MH
Z
Choose between Yes or No. Default is No. If attached Sink device supports only <=165MHz,
limit is: (AVcc -
600mVolts) ≤ VL ≤ (AVcc - 400mVolts). If attached Sink device supports
>165MHz, limit is: (AVcc -
700mVolts) ≤ VL ≤ (AVcc - 400mVolts).
Specific to “Test7-4: TMDS TRise, TFall” Group
R
ECALLED
W
AVEFORM
F
ILE
I
NDEX
(5
DIGITS
)
Enter the 5 digits number corresponding to the index of the file you want to recall. Default is
00000.
U
SE INTERNAL PEAK IF SIGNAL HAS TWO PEAKS
Default is No. Choose Yes to debug specific signal shape. HDMI signals can have two peaks in
amplitude. Classic measure of rise/fall time at 20-80% doesn't give stable results in this case.
So if two peaks are detected, we can use the internal one to determine rise/fall levels. But we
have observed signals with "faked" internal peaks. These additional peaks give inaccurate (too
short) rise/fall time. So disabling the use of internal peaks allows forcing usage of the highest
peaks.
Specific to “Test7-6: TMDS Inter-Pair Skew” Group
D
ATA
-D
ATA TEST COMBINATIONS
Choose the combination of Data Pair to be tested between D0-D2 or D0-D1 or D2-D1 or D0-
D2,D0-D1,D2-D1. The last option is the default and will test all Data Pairs.
R
ECALLED
W
AVEFORM
F
ILE
I
NDEX
(5
DIGITS
)
Enter the 5 digits number corresponding to the index of the file you want to recall. Default is
00000.
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