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14–8 Chapter 14: Arria V GZ Transceiver Native PHY IP Core
PMA Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
RX PMA Parameters
Table 146 describes the RX PMA options you can specify.
f For more information about the CDR circuitry, refer to the Receiver PMA Datapath
section in the Transceiver Architecture in Arria V Devices.
Table 147 lists the best case latency for the most significant bit of a word for the RX
deserializer for the PMA Direct datapath. For example, for an 8-bit interface width,
the latencies in UI are 11 for bit 7, 12 for bit 6, 13 for bit 5, and so on.
Table 14–6. RX PMA Parameters
Parameter Range Description
Enable CDR dynamic
reconfiguration
On/Off
When you turn this option On, you can dynamically change the
reference clock input the CDR circuit. This option is also required
to simulate TX PLL reconfiguration.
Number of CDR reference clocks 1–5 Specifies the number of reference clocks for the CDRs.
Selected CDR reference clock 0–4 Specifies the index of the selected CDR reference clock.
Selected CDR reference clock
frequency
Device Dependent Specifies the frequency of the clock input to the CDR.
PPM detector threshold Device Dependent
Specifies the maximum PPM difference the CDR can tolerate
between the input reference clock and the recovered clock.
Enable rx_pma_clkout port On/Off
When you turn this option On, the RX parallel clock which is
recovered from the serial received data is an output of the PMA.
Enable rx_is_lockedtodata port On/Off
When you turn this option On, the
rx_is_lockedtodata
port is
an output of the PMA.
Enable rx_is_lockedtoref port On/Off
When you turn this option On, the
rx_is_lockedtoref
port is
an output of the PMA.
Enable rx_set_lockedtodata and
rx_set_locktoref ports
On/Off
When you turn this option On, the
rx_set_lockedtdata
and
rx_set_lockedtoref
ports are outputs of the PMA.
Enable rx_pma_bitslip_port On/Off
When you turn this option On, the
rx_pma_bitslip
is an input
to the core. The deserializer slips one clock edge each time this
signal is asserted. You can use this feature to minimize
uncertainty in the serialization process as required by protocols
that require a datapath with deterministic latency such as CPRI.
Enable rx_seriallpbken port On/Off
When you turn this option On, the
rx_seriallpbken
is an input
to the core. When your drive a 1 on this input port, the PMA
operates in loopback mode with TX data looped back to the RX
channel.
Table 14–7. Latency for RX Deserialization in Arria V GZ Devices (Part 1 of 2)
FPGA Fabric Interface Width Arria V GZ Latency in UI
8 bits 11
10 bits 13
16 bits 19
20 bits 23
32 bits 35
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