Cyclone V Device Handbook: Volume 2: Transceivers

ID 683586
Date 10/24/2018
Document Table of Contents

1.2.4. Clock Divider

Each Cyclone® V transmitter channel has a clock divider.

There are two types of clock dividers, depending on the channel location in a transceiver bank:

  • Local clock divider—channels 0, 2, 3, and 5 provide serial and parallel clocks to the PMA
  • Central clock divider—channels 1 and 4 can drive the x6 and xN clock lines
Figure 19. Clock Divider for a Transceiver Channel in Cyclone V Devices

Both types of clock dividers can divide the serial clock input to provide the parallel and serial clocks for the serializer in the channel if you use clocks from the clock lines or transmit PLLs. The central clock divider can additionally drive the x6 clock lines used to bond multiple channels.

In bonded channel configurations, both types of clock dividers can feed the serializer with the parallel and serial clocks directly, without dividing them from the x6 or xN clock lines.