Altera Transceiver PHY IP Core Manual de usuario Pagina 309

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Parameter Range Description
Enable rx_clkslip port On/Off When you turn this option On, the rx_clkslip
control input port is enabled. 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.
The following table 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 12-8: Latency for RX Deserialization in Stratix V Devices
FPGA Fabric Interface Width Stratix V Latency in UI
8 bits 11
10 bits 13
16 bits 19
20 bits 23
32 bits 35
40 bits 43
64 bits 99
80 bits 123
Table 12-9: Latency for TX Serialization in Stratix V Devices
The following table lists the best- case latency for the LSB of the TX serializer for all supported interface widths for
the PMA Direct datapath.
FPGA Fabric Interface Width Stratix V Latency in UI
8 bits 44
10 bits 54
16 bits 68
20 bits 84
32 bits 100
40 bits 124
64 bits 132
80 bits 164
UG-01080
2015.01.19
PMA Parameters for Stratix V Native PHY
12-11
Stratix V Transceiver Native PHY IP Core
Altera Corporation
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