Intel Cyclone 10 GX User Manual

6.11.2. Switching Reference Clocks
You can dynamically switch the input clock source for the ATX PLL, the fPLL, the CDR,
and the CMU.
6.11.2.1. ATX Reference Clock Switching
You can use the reconfiguration interface on the ATX PLL instance to specify which
reference clock source drives the ATX PLL. The ATX PLL supports clocking up to five
different reference clock sources. The flow to select between the different reference
clock sources is independent of the number of transmitter PLLs specified in the
Parameter Editor.
Before initiating a reference clock switch, ensure that your ATX PLL instance defines
more than one reference clock source. Specify the Number of PLL reference clocks
parameter on the PLL tab during ATX PLL parameterization.
The following table shows the addresses and bits for switching between ATX PLL
reference clock inputs. The number of exposed pll_refclk ports varies according to
the number of reference clocks you specify. Use the ATX PLL reconfiguration interface
for this operation.
Table 180. Register Map for Switching ATX PLL Reference Clock Inputs
Transceiver ATX PLL
Port
Description Address Bits
pll_refclk0 Represents logical refclk0. Lookup register
x113[7:0] stores the mapping from logical
refclk0 to the physical refclk.
0x113 (Lookup Register) [7:0]
pll_refclk1 Represents logical refclk1. Lookup register
x114[7:0] stores the mapping from logical
refclk1 to the physical refclk.
0x114 (Lookup Register) [7:0]
pll_refclk2 Represents logical refclk2. Lookup register
x115[7:0] stores the mapping from logical
refclk2 to the physical refclk.
0x115 (Lookup Register) [7:0]
pll_refclk3 Represents logical refclk3. Lookup register
x116[7:0] stores the mapping from logical
refclk3 to the physical refclk.
0x116 (Lookup Register) [7:0]
pll_refclk4 Represents logical refclk4. Lookup register
x117[7:0] stores the mapping from logical
refclk4 to the physical refclk.
0x117 (Lookup Register) [7:0]
N/A ATX refclk selection MUX. 0x112 [7:0]
6. Reconfiguration Interface and Dynamic Reconfiguration
UG-20070 | 2018.09.24
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Intel Cyclone 10 GX Specifications

General

Brand	Intel
Model	Cyclone 10 GX
Category	Transceiver
Language	English