Xilinx ChipScope Pro User Manual page 117

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The Channel Reset button resets the GTP transceiver channel by clearing and resetting all
internal PMA and PCS circuitry as well as the related fabric interfaces.
The TX Polarity Invert setting controls the polarity of the data sent out of the TX pins of the
GTP transceiver channel. To change the polarity of the TX side of the GTP transceiver,
check the TX Polarity Invert box.
The TX Bit Error Inject button inverts the polarity of a single bit in a single transmitted
word. The receiver endpoint of the channel that is connected to this transmitter should
detect a single bit error.
The TX Diff Output Swing combo box controls the differential swing of the transmitter.
Change the value in the combo box to change the swing.
The TX Pre-Cursor and TX Post-Cursor combo boxes control the amount of pre-emphasis
on the transmitted signal. Change the value in the combo boxes to change the pre-
emphasis settings.
The RX Polarity Invert setting controls the polarity of the data received from the RX pins
of the GTP transceiver channel. To change the polarity of the RX side of the GTP
transceiver, check the RX Polarity Invert box.
The RX Termination Mode and RX Termination Voltage settings are used to control the
receiver termination characteristics of the GTP channel. Use the RX Termination Mode
combo box to control the mode for the termination voltage. Use the RX Termination
Voltage combo box to control the common mode when RX Termination Mode is set to
Programmable.
BERT Settings
The TX/RX Data Pattern settings are used to select the data pattern that is used by the
transmit pattern generator and receive pattern checker, respectively. These patterns
include PRBS 7, 15, 23, and 31, and Clk 2x and 10x.
The BERT Settings also include RX Received Bit Counter, RX Bit Error Count, and Bit Error
Ratio (BER) indicator. The BERT Reset button is used to reset these counters.
Clocking Settings
ChipScope Pro Software and Cores User Guide
UG029 (v14.3) October 16, 2012
Far-End PMA: The circuit originates and ends at some external channel endpoint (for
example, external test equipment or another device) but passes through the part of the
GTP transceiver channel. For this GTP transceiver loopback mode, the signal comes
into the RX pins, passes through the PMA circuitry, and returns immediately to the TX
pins.
Far-End PCS: The circuit originates and ends at some external channel endpoint (for
example, external test equipment or another device), but passes through part of the
GTP transceiver channel. For this GTP loopback mode, the signal comes into the RX
pins, passes through the PMA, through the PCS, back through the PMA, and returns
to the TX pins.
Far-End Fabric: The circuit originates and ends at some external channel endpoint (for
example, external test equipment or another device), but passes through the entire
GTP transceiver channel and related fabric logic. For this GTP transceiver loopback
mode, the signal comes into the RX pins, passes through the PMA and PCS, through a
shallow fabric-based FIFO, back through the PCS and PMA, and finally returns to the
TX pins.
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ChipScope Pro Analyzer Features
117