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Ixiasoft
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Ixiasoft
5.3.2.3. I/O Termination
Number |
Done? |
Checklist Item |
---|---|---|
1 |
Check I/O termination and impedance matching for chosen I/O standards, especially for voltage-referenced standards. |
Voltage-referenced I/O standards require both a VREF and a termination voltage (VTT). The reference voltage of the receiving device tracks the termination voltage of the transmitting device. Each voltage-referenced I/O standard requires a unique termination setup.
Although single-ended, non-voltage-referenced I/O standards do not require termination, impedance matching is necessary to reduce reflections and improve signal integrity.
Agilex™ 5 on-chip series and parallel termination provides the convenience of no external components. Alternatively, you can use external pull-up resistors to terminate the voltage-referenced I/O standards such as SSTL and HSTL.
Differential I/O standards typically require a termination resistor between the two signals at the receiver. The on-chip differential resistor is supported whether 1.05 V, 1.1 V, 1.2 V, or 1.3 V is used for true differential signaling.