Tx positive source, Tx2 positive source, Vdiv – Teledyne LeCroy QPHY-PCIE3 User Manual
Page 21: Specific to “transmitter tests” group, Deskew measure mode, Skew (txn, txp) (in picoseconds), Skew (tx2p, txp) (in picoseconds), Skew (tx2n, txp) (in picoseconds), Specific to “test 1.4 compliance eye 8 gt/s” group, Clock slope
QPHY-PCIE3 Operator’s Manual
T
X
P
OSITIVE
S
OURCE
This variable allows the user to specify the channel being used to measure Lane A Tx+.
T
X
2
P
OSITIVE
S
OURCE
This variable allows the user to specify the channel being used to measure Lane B Tx+.
V
DIV
Sets the V/div on the oscilloscope channels in use. The Max Tx voltage is 1300 mVpp. At FS,
each side of the differential voltage should be at most 650 mVpp or ± 325 mV. An 85 mV Vertical
scale (*8 divisions) defines the A-to-D voltage range to be between -340 mV and 340 mV.
Specific to “Transmitter Tests” Group
D
ESKEW MEASURE MODE
This variable allows the user to whether to enter the deskew values to use or to use the wizard
method for calculating the skew. Use "Wizard Measured" to launch the automated deskew
measurement. Use "User Defined" and set the Deskew value in picoseconds variable if you
know the deskew required for your setup.
S
KEW
(T
XN
,
T
XP
)
(
IN PICOSECONDS
)
This variable allows the user to specify the cable skew between cables attached to Tx- and Tx+.
The value (in picoseconds) is applied to the channel attached to Tx-. Skew calculation: Txp -
Txn (edge crossing time).
S
KEW
(T
X
2
P
,
T
XP
)
(
IN PICOSECONDS
)
This variable allows the user to specify the cable skew between cables attached to Tx2+ and
Tx+. The value (in picoseconds) is applied to the channel attached to Tx2+. Skew calculation:
Txp - Tx2p (edge crossing time).
S
KEW
(T
X
2
N
,
T
XP
)
(
IN PICOSECONDS
)
This variable allows the user to specify the cable skew between cables attached to Tx2- and
Tx+. The value (in picoseconds) is applied to the channel attached to Tx2-. Skew calculation:
Txp - Tx2n (edge crossing time)
Specific to “Test 1.4 Compliance Eye 8 GT/s” Group
C
LOCK
S
LOPE
This variable specifies the edge the data transitions on relative to the 100 MHz system
reference clock. This variable pertains only to the system board CEM Compliance Eye. This
variable is set to Pos by default.
CTLE
DC
G
AIN
(
D
B)
This variable allows the user to specify the DC Gain (dB) for the Continuous Time Linear
Equalizer (CTLE).
922544 Rev A
17