ChipScope Pro Software and Cores User Guide
117
UG029 (v14.3) October 16, 2012
ChipScope Pro Analyzer Features
•
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.
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
