Altera Phase-Locked Loop Manual do Utilizador descarregar pdf (Página 13)

Figure 2: PLL cclk Cascading and adjpllin Cascading Modes

adjpllin Cascadingcclk Cascading

Output Counter 17

Upstream PLL

cclk Port

adjpllin Port

Downstream PLL

Upstream PLL

Downstream PLL

Output Counter 4

The clock input to PLL comes from the clock input multiplexers. The clock input multiplexers provide

multiple clock sources as reference clock inputs for fractional PLL.

Table 8: Reference Clock Inputs for Fractional PLL

Sources Description

coreclkin Core reference clock from clock network.

adjpllin Adjacent fractional PLL clock source.

refclkin[0] Clock source from adjacent PMA triplet LVPECL buffer.

UG-01087

2015.05.04

PLL-to-PLL Cascading

Altera Phase-Locked Loop (Altera PLL) IP Core User Guide

Altera Corporation

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Altera Phase-Locked Loop Manual do Utilizador Página 13