Altera Stratix IV GT 100G - Manual (Page 47)

Chapter 6: Board Test System 6–25
Using the Board Test System
October 2010 Altera Corporation Stratix IV GT 100G Development Kit User Guide
1 You must have the QSFP loopback module installed on your 100G development board
for this test to work correctly.
The following sections describe the controls on the QSFP tab.
Start
The Start control initiates the QSFP loopback test.
Stop
The Stop control terminates the QSFP loopback text.
PMA Setting
The PMA Setting button allows you to make changes to the PMA parameters that
affect the active transceiver interface. The following settings are available for analysis:
■ Serial Loopback —Routes signals from the receiver to the transmitter.
■ 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.
■ Equalizer —Specifies the setting for the receiver equalizer.
■ DC gain —Specifies the boost to incoming signals.
Data Pattern
The Data pattern control specifies the type of data contained in the transactions. The
following data types are available for analysis:
■ PRBS 7 —Selects pseudo-random 7-bit sequences.
■ PRBS 15 —Selects pseudo-random 15-bit sequences.
■ PRBS 23 —Selects pseudo-random 23-bit sequences.
■ PRBS 31 —Selects pseudo-random 31-bit sequences.
Error Control
The Error control controls display data errors detected during analysis and allow you
to insert errors:
■ Detected errors —Displays the number of data errors detected in the hardware.
■ Inserted errors —Displays the number of errors inserted into the transaction
stream.