Altera Signal Integrity Development Kit, Stratix V GX Edition - Manual (Page 35)

Chapter 6: Board Test System 6–15
Using the Board Test System
July 2012 Altera Corporation Transceiver Signal Integrity Development Kit
Stratix V GX Edition User Guide
1 No loopback is provided. A loopback backplane can be purchased from Amphenol.
The following sections describe the controls on the Amphenol tab.
Status
The Status control displays the following status information during the loopback test:
■ PLL lock —Shows the PLL locked or unlocked state.
■ Channel lock —Shows the channel locked or unlocked state. When locked, all
lanes are word aligned and channel bonded.
■ Pattern sync —Shows the pattern synced or not synced state. The pattern is
considered synced when the start of the data sequence is detected.
Port
The Port control allows you to specify the type of test to run on the Amphenol port.
The following Amphenol port tests are available:
■ Amphenol x4 Transceivers
■ aggressor 1 to 6 —If available, turning on an aggressor box will turn on the
adjacent aggressor channels adding switching noise to the victim channel to be
used for backplane analysis.
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 between 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 DC portion of the receiver equalizer.
Data Type
The Data type control specifies the type of data contained in the transactions. Select
the following available data types for analysis:
■ PRBS7 —pseudo-random 7-bit sequences (default)
■ PRBS15 —pseudo-random 15-bit sequences
■ PRBS23 —pseudo-random 23-bit sequences