Altera Cyclone V SoC - Manual (Page 32)

5–14 Chapter 5: Board Test System
Using the Board Test System
Cyclone V SoC Development Kit November 2013 Altera Corporation
User Guide
XCVR, LVDS, CMOS
These groups displays the following XCVR, LVDS, CMOS status information during
the loopback test:
■ Data rate —Displays the current XCVR data rate in megabytes per second (MBps).
■ Freq —Displays the data rate frequency in MHz which is equivalent to Mbps.
■ Bits —Displays the number of bits transmitted since clicking Start.
■ Inserted errors —Displays the number of errors inserted by clicking Insert Error
button.
■ Detected errors —Displays the number of bit errors detected by the error checking
circuitry.
■ BER —Displays the bit error rate of the interface.
■ PLL lock —Displays Yes if the SDI PLL is locked.
■ Pattern Sync —Displays Yes if the receiver has detected the input data pattern.
■ Start— Starts the PRBS data test and begins to monitor and update screen with
live test results.
■ Stop —Stops the PRBS data test.
■ Insert Error —Inserts an error into a data stream that is detected by the receiver
when in loopback using the included video cable.
With the Insert Error, there are differences among the three ports:
XCVR—inserts 4 errors at 1 click due to 4 test control blocks in the design.
LVDS—inserts 3 errors at 1 click due to 3 test control block in the design.
CMOS—inserts 1 error at 1 click.
■ Clear —Clears the Detected errors counter.
■ PMA Setting —Opens the PMA settings window that allows for adjusting the
analog transceiver settings, such as output voltage, loopback settings, and
equalization.
The following settings are available for analysis:
■ Serial Loopback —Routes the selected TX output signal back to the RX input
signal on-chip to verify operation without using an external loopback board.
■ VOD —Specifies the voltage output (differential) of the transmitter buffer.
■ Pre-emphasis tap
■ Pre —Specifies the amount of pre-emphasis on the pre-tap of the transmitter
buffer.
■ First post —Specifies the amount of pre-emphasis on the first post tap of the
transmitter buffer.
■ Second post —Specifies the amount of pre-emphasis on the second post tap
of the transmitter buffer.