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Ixiasoft
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Ixiasoft
1.1.4.3.1. Auxiliary Transmit (ATX) PLL Architecture
Compared with CMU PLLs, ATX PLLs have lower jitter and do not consume a transceiver channel; however an ATX PLL’s frequency range is more limited.
The serial clock from the ATX PLL is routed to the transmitter clock dividers and can be further divided down to half the data rate of the individual channels. For best performance you should use the reference clock input that resides in the same transceiver block as your channel. However, you can use any dedicated reference clocks along the same side of the device to clock the ATX PLL.