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Ixiasoft
5.3.7. The FMCB Tab
The FMCB tab allows you to perform loopback tests on the FMCB port.
Figure 41. The FMCB Tab
![](/content/dam/docs/us/en/683303/current/tmr1522449711190.png)
The following sections describe the controls on the FMCB tab.
Status
Displays the following status information during a loopback test:
- 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.
- Details: Shows the PLL lock and pattern status:
Port
Allows you to specify which interface to test. The following port tests are available:
- XCVR
- CMOS
PMA Setting
![](/content/dam/docs/us/en/683303/current/ggr1521583698525.png)
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.
- VOD: Specifies the voltage output differential of the transmitter buffer.
- Pre-emphasis tap:
- 1st Pre: Specifies the amount of pre-emphasis on the pre-tap of the transmitter buffer.
- 1st Post: Specifies the amount of pre-emphasis on the first post tap of the transmitter buffer.
- Equalizer: Specifies the CLTE EQ Gain for the receiver.
- AC Gain: Specifies the CLTE AC Gain for the receiver.
- VGA: Specifies the VGA gain for the receiver.
Data Type
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.
- HF: Selects highest frequency divide-by-2 data pattern 10101010.
- LF: Selects lowest frequency divide-by-33 data pattern.
Error Control
Displays data errors detected during analysis and allows 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 transmit data stream.
- Insert: Inserts a one-word error into the transmit data stream each time you click the button. Insert is enabled only 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 maximum theoretical data rate that the requested transactions are able to achieve.
- Start: this control initiates the loopback tests.
- Tx (Mbps) and Rx (Mbps): Show the number of bytes of data analyzed per second.
- Data Rate: Shows the data rate for each link.