
9–12 Chapter 9: Custom PHY IP Core
PLL Reconfiguration Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
PLL Reconfiguration Parameters
Table 9–9 lists the PLL Recon figurations options. For more information about
transceiver reconfiguration registers, refer to Transceiver Reconfiguration Controller
IP Core.
Table 9–9. PLL Reconfigurations
Name Value Description
Allow PLL Reconfiguration On/Off
You must enable this option if you plan to reconfigure the PLLs in
your design. This option is also required to simulate PLL
reconfiguration.
Number of TX PLLs 1–4
Specifies the number of TX PLLs required for this instance of the
Custom PHY. More than 1 PLL may be required if your design
reconfigures channels to run at multiple frequencies.
You must disable the embedded reset controller and design your
own controlled reset controller or the use the highly configurable
reset core described in “Transceiver Reconfiguration Controller IP
Core” if you intend to use more than 1 TX PLL for a Custom PHY IP
instance.
Number of reference clocks 1–5
Specifies the number of input reference clocks. More than one
reference clock may be required if your design reconfigures channels
to run at multiple frequencies.
Main TX PLL logical index 0–3
Specifies the index for the TX PLL that should be instantiated at
startup. Logical index 0 corresponds to TX PLL0, and so on.
CDR PLL input clock source 0–3
Specifies the index for the CDR PLL input clock that should be
instantiated at startup. Logical index 0 corresponds to input clock 0
and so on.
TX PLL (0–3)
(Refer to Custom PHY General Options for a detailed explanation of these parameters.)
PLL Type
CMU
ATX
Specifies the PLL type.
PLL base data rate
1 × Lane rate
2 × Lane rate
4 × Lane rate
Specifies Base data rate.
Reference clock frequency Variable
Specifies the frequency of the PLL input reference clock. The
frequency required is the Base data rate/2. You can use any Input
clock frequency
that allows the PLLs to generate this frequency.
Selected reference clock
source
0–4
Specifies the index of the input clock for this TX PLL. Logical index 0
corresponds to input clock 0 and so on.
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