126.96.36.199. Auxiliary Transmit (ATX) PLL Architecture
Most Stratix V GT, GX, and GS devices contain two ATX PLLs per transceiver bank that can generate the high-speed clocks for the transmitter channels; the 66-channel device is an exception with only one ATX PLL in the top bank. 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 pins that reside in the same transceiver block as your channel. However, you can use any dedicated reference clock input pins along the same side of the device to clock the ATX PLL.
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