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ChipScope Pro Software and Cores User Guide
UG029 (v14.3) October 16, 2012
Chapter 4:
Using the ChipScope Pro Analyzer
MGT Settings
The
MGT Alias
setting is initially set to the MGT number of the GTX transceiver, but can
be changed by selecting the field and typing in a new value.
The
Tile Location
setting denotes the X/Y coordinate of the GTX transceiver in the device.
The
MGT Link Status
indicator is displays the status of the link detection logic that is
connected to the receiver of a particular GTX transceiver channel. If the channel is linked
(green), the measured line rate is displayed. If the channel is not linked, it displays NOT
LOCKED (red).
The
PLL Status
indicator shows the lock status of the PLL that is connected to the GTX
transceiver. The valid states of this status indicator are LOCKED (green) or NOT LOCKED
(red).
The
Loopback Mode
setting is used to control the loopback mode of a particular GTX
transceiver channel. The valid choices for loopback mode are:
•
None: No feedback path is used.
•
Near-End PCS: The circuit is wholly contained within the near-end GTX transceiver
channel. It starts at the TX fabric interface, passes through the PCS, and returns
immediately to the RX fabric interface without ever passing through the PMA side of
the GTX channel.
•
Near-End PMA: The circuit is wholly contained within the near-end GTX transceiver
channel. It starts at the TX fabric interface, passes through the PCS, through the PMA,
back through the PCS, and returns to the RX fabric interface.
•
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
GTX transceiver channel. For this GTX 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
GTX transceiver channel. For this GTX 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.
The
DUAL Reset
button resets both GTX transceivers in the DUAL by clearing and
resetting all internal PMA and PCS circuitry as well as the related fabric interfaces.
The
Channel Reset
button resets the GTX 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
GTX transceiver channel. To change the polarity of the TX side of the GTX 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-Emphasis
combo box controls the amount of pre-emphasis on the transmitted
signal. Change the value in the combo box to change the emphasis.
