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11–8 Chapter 11: Deterministic Latency PHY IP Core
General Options Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
General Options Parameters
The General Options tab allows you to set the basic parameters of your transceiver
PHY. Table 116 lists the settings available on the General Options tab.
Table 11–6. General Options (Part 1 of 2)
Name Value Description
Device family
Arria V
Cyclone V
Stratix V
Specifies the device family. Arria V, Cyclone V, and Stratix V are
available.
Mode of operation
Duplex
TX
RX
You can select to transmit data, receive data, or both.
Number of lanes 1–32 The total number of lanes in each direction.
FPGA fabric transceiver
interface width
8, 10, 16,
20,32, 40
Specifies the word size between the FPGA fabric and PCS. Refer to
Sample Channel WIdth Options for Supported Serial Data Rates for
the data rates supported at each word size.
PCS-PMA interface width
10
20
Specifies the datapath width between the transceiver PCS and PMA.
A deserializer in the PMA receives serial input data from the RX
buffer using the high-speed recovered clock and deserializes it using
the low-speed parallel recovered clock.
PLL type
CMU
ATX
Specifies the PLL type. The CMU PLL has a larger frequency range
than the ATX PLL. The ATX PLL is designed to improve jitter
performance and achieves lower channel-to-channel skew; however,
it supports a narrower range of data rates and reference clock
frequencies. Another advantage of the ATX PLL is that it does not use
a transceiver channel, while the CMU PLL does. Because the CMU
PLL is more versatile, it is specified as the default setting.
Data rate
Device
Dependent
If you select a data rate that is not supported by the configuration
you have specified, the MegaWizard displays a error message in the
message pane. Sample Channel WIdth Options for Supported Serial
Data Rates for sample the channel widths that support these data
rates.
Base data rate
1 × Data rate
2 × Data rate
4 × Data rate
8 × Data rate
For
systems that transmit and receive data at more than one data
rate, select a base data rate that minimizes the number of PLLs
required to generate the clocks for data transmission. The
Recommended Base Data Rate and Clock Divisors for CPRI table
lists the recommended Base data rates for various Data rates.
The available options are dynamically computed based on the Data
rate you specified as long as those Base data rates are within the
frequency range of the PLL.
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