Altera Transceiver Signal Integrity - Manual (Page 24)

6–6 Chapter 6: Stratix IV GX Transceiver Signal Integrity Demonstration
Running the Demonstration Application and Test Designs
Transceiver Signal Integrity Development Kit, December 2011 Altera Corporation
Stratix IV GX Edition User Guide
Data Patterns
The application supports PRBS15i, PRBS7, PRBS23, CJTPAT, compliance pattern (only
for specific designs and channels), high frequency, and low frequency patterns. No
synchronization patterns are sent prior to sending the PRBS pattern. Therefore, you
can use a third party receiver to recognize the PRBS/CJTPAT data.
Data verifiers are not available for the high frequency (1010..) and low frequency (5’1s
and 5’0s) patterns.
Link Statistics Tab
The Link Statistics settings include the following options:
Table 6–5.
Parameter Description
What statistic to
display?
Displays the BER, number of bits received, number of errors received, and the error slope based on the
selection from the list.
The error slope shows the error trend (increase or decrease). You can use this statistic to determine
whether the PMA control settings must be increased or decreased to get an error free link.
Inject Error Injects errors in the channels. Every time this button is asserted, one-bit error is introduced.
Data Patrst Reset for the data pattern generators and checkers.
Data Rate
Based on the test design selected, the application displays the serial data rate of the transceiver
channels.
GXB Encoding Displays whether the data sent by the test design is 8B/10B encoded.
DataChk Status
The DataChk Status field displays the following:
■ synced status displayed in green indicates that the error checker has received the predefined header
byte and no errors are detected.
■ unsynced status displayed in gray indicates that the error checker has not received the selected
pattern.
n If the DataChk Status field shows unsynced, check whether the transmitter of the channel
showing unsynced is connected to the receiver channel by external cable or by internal serial
loopback. However, when sending the high frequency data pattern, the DataChk Status shows
unsynced. This is because the error checker is not provided for high frequency pattern.
■ error status indicates that the error checker is detecting errors in the received pattern.
CDRLock Mode
Shows whether the transceiver Clock Recovery Unit (CRU) is locked to the reference clock or to the
data. When the transceiver locks to the incoming data, this field displays data indicating that the
receive PLL has recovered the clock from the incoming data.
Freeze Display
When you click the Freeze display button, the display field does not change and the counting
continues. When you click the Unfreeze display, the current running values are shown.