Arria® V Device Handbook: Volume 2: Transceivers

ID 683573
Date 5/29/2020
Document Table of Contents

2.1.2. Dual-Purpose RX/refclk Pin

When not used as receiver, an RX differential pair can be used as an additional input reference clock source. The clock from the RX pins feed the RX clock network that spans all the channels on one side of the device.

Only one RX differential pair for every three channels can be used as input reference clock at a time. The following figure shows the use of dual-purpose RX/refclk differential pin as input reference clock source and the RX clock network.

  • An RX differential pair from another bank can be used as an input reference clock pin on the same side of the device.
  • refclk switching cannot be performed when dual-purpose RX differential pins are used as refclk pins.
Figure 44. Dual-Purpose RX/refclk Pin as an Input Reference Clock

Figure 45. Dual-Purpose RX/refclk Pin as an Input Reference Clock for GZ Devices