Altera UG-01080 Betriebsanweisung Seite 206

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10–8 Chapter 10: Low Latency PHY IP Core
PLL Reconfiguration Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
CDR PLL input clock source 0–3
Specifies the index for the TX 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 Low Latency PHY General Options for a detailed explanation of these parameters.)
PLL Type
CMU
ATX
Specifies the PLL type.
Base data rate
1 × Data rate
2 × Data rate
4 × Data rate
8 × Data 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.
Channel Interface
Enable Channel Interface
On/Off
Turn this option on to enable PLL and datapath dynamic
reconfiguration. When you select this option, the width of
tx_parallel_data
and
rx_parallel_data
buses increases in
the following way.
Standard datapath:
The
tx_parallel_data
bus is 44 bits per lane; however, only
the low-order number of bits specified by the FPGA fabric
transceiver interface width contain valid data for each lane.
The
rx_parallel_data
bus is 64 bits per lane; however, only
the low-order number of bits specified by the FPGA fabric
transceiver interface width contain valid data.
10G datapath:
The both the
tx_parallel_data
and
rx_parallel_data
buses are 64 bits per lane; however, only the low-order number
of bits specified by the FPGA fabric transceiver interface
width contain valid data.
Table 10–6. PLL Reconfigurations (Part 2 of 2)
Name Value Description
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