13.7. xN Non-Bonded Clocking
- Supports data rate negotiation between link partners on a per-channel basis.
- Supports data rates are not simple integer multiples of a single base data rate.
- Supports PLL and channel reconfiguration.
The Native PHY preset for CPRI specifies non-bonded clocks. In multi-channel configurations, CPRI can use both ATX PLLs in a transceiver bank to generate two base data rates. When necessary, CPRI uses dynamic reconfiguration to change the local clock dividers to generate the negotiated clock rate.
The channel span for xN non-bonded clocks is almost identical to the span for bonded clocks as illustrated in Figure 72. However, the center channel that provides central clock divider cannot be used as a data channel because this channel cannot generate the parallel clock. The maximum channel span is 26 channels. There is a single-channel break in the contiguous channel sequence.