Visible to Intel only — GUID: zln1686160519444
Ixiasoft
Visible to Intel only — GUID: zln1686160519444
Ixiasoft
4.2.5.1. The QSFPDD NRZ Tab
The following sections describe controls in the QSFPDD NRZ tab:
Status
The Status control displays the following status information during the loopback test:
- PLL Lock: Shows the PLL locked or unlocked state.
- Pattern Sync: Shows the pattern synced or not state. The pattern is considered synced when the start of the data sequence is detected.
- Detail: Shows the PLL lock and pattern sync status. The number of the error bits of each channel can be found here.
![](/content/dam/docs/us/en/782461/current/luw1686160799610.png)
Control
Use the following controls to select an interface to apply PMA settings, data type, and error control:
- QSFPDD0x8
- QSFPDD1x8
PMA Setting
Allows you to make changes to the PMA parameters that affect the active transceiver interface. The following settings are available for analysis:
- Serial Loopback: Displays the signal status between the transmitter and the receiver.
- VOD: Specifies the voltage output differential of the transmitter buffer.
- Pre-emphasis tap:
- Pre-tap 1: Specifies the amount of pre-emphasis on the first pre-tap of the transmitter buffer.
- Pre-tap 2: Specifies the amount of pre-emphasis on the second pre-tap of the transmitter buffer.
- Post-tap 1: Specifies the amount of pre-emphasis on the post-tap of the transmitter buffer.
![](/content/dam/docs/us/en/782461/current/wdw1686160976507.png)
Data Type
The Data Type control specifies the type of data pattern contained in the transactions. Select the following available data types for analysis:
- PRBS7: Pseudo-random 7-bit binary sequences.
- PRBS15: Pseudo-random 15-bit binary sequences.
- PRBS23: Pseudo-random 23-bit binary sequences.
- PRBS31: Pseudo-random 31-bit binary sequences (default).
Error Control
This control displays data errors detected during analysis and allows you to insert errors:
- Detected Errors: Displays the number of data errors detected in the received bitstream.
- Inserted Errors: Displays the number of errors inserted into the transmit data stream.
- Bit Error Rate: Calculates the bit error rate of the transmit data stream.
- Inserts: Inserts a one-word error into the transmit data stream each time you click the button. Insert error is only enabled during transaction performance analysis.
- Clear: Resets the Detected Errors counter and Inserted Errors counter to zero.
Run Control
- TX and RX performance bars: Show the percentage of the maximum theoretical data rate that the requested transactions are able to achieve.
- Start: Initiates the loopback tests.
- Data Rate: Displays the XCVR type and data rate of each channel.
![](/content/dam/docs/us/en/782461/current/aea1686161148508.png)