Altera Transceiver Signal Integrity - Manual (Page 36)

6–12 Chapter 6: Board Test System
Using the Board Test System
Transceiver Signal Integrity Development Kit, February 2013 Altera Corporation
Stratix V GT Edition User Guide
Port
■ GXB x1 Transceivers —Controls the following single transceiver channel:
{GXB_RXLp_11}
{GXB_TXLp_11}
■ GXB x5 Transceivers —Controls controls the following five transceiver channels:
{GXB_RXLp_17, GXB_RXLp_15, GXB_RXLp_14, GXB_RXLp_13, GXB_RXLp_12}
{GXB_TXLp_17, GXB_TXLp_15, GXB_TXLp_14, GXB_TXLp_13, GXB_TXLp_12}
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 transmitter and the receiver. Enter
the following values to enable the serial loopbacks:
0 = high speed serial transceiver signals to loopback on the board
1 = serial loopback
2 = reverse serial loopback pre-CDR
4 = reverse serial loopback post-CDR
■ 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
■ PRBS31 —pseudo-random 31-bit sequences
■ HF1 —highest frequency divide-by-2 data pattern "10101010"
■ HF2 —next highest frequency divide-by-6 data pattern "111000111000"
■ HF3 —second lowest frequency divide-by-22 data pattern
■ LF —lowest frequency divide by 33 data pattern