Altera Stratix IV GT 100G - Manual (Page 43)

Chapter 6: Board Test System 6–21
Using the Board Test System
October 2010 Altera Corporation Stratix IV GT 100G Development Kit User Guide
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.
■ Insert Error —Inserts a one-word error into the transaction stream each time you
click the button. Insert Error is only enabled during transaction performance
analysis.
■ Clear —Resets the Detected errors and Inserted errors counters to zeros.
Status
These controls display current transaction performance analysis information collected
since you last clicked Start:
■ PLL lock —Shows the PLL locked or unlocked state.
■ Pattern sync —Shows the pattern synced or not synced state. The pattern is
considered synced when the start of the data sequence is detected.