Altera UG-01080 Betriebsanweisung Seite 298

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13–12 Chapter 13: Arria V Transceiver Native PHY IP Core
Standard PCS Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
8B/10B
The 8B/10B encoder generates 10-bit code groups from the 8-bit data and 1-bit control
identifier. In 8-bit width mode, the 8B/10B encoder translates the 8-bit data to a 10-bit
code group (control word or data word) with proper disparity. The 8B/10B decoder
decodes the data into an 8-bit data and 1-bit control identifier. Table 13–14 describes
the 8B/10B encoder and decoder options.
f For more information refer to the 8B/10B Encoder and 8B/10B Decoder sections in the
Transceiver Architecture in Arria V Devices.
Rate Match FIFO
The rate match FIFO compensates for the very small frequency differences between
the local system clock and the RX recovered clock. Table 13–15 describes the rate
match FIFO parameters.
f For more information refer to the Rate Match FIFO sections in the Transceiver
Architecture in Arria V Devices.
Word Aligner and Bit-Slip Parameters
The word aligner aligns the data coming from RX PMA deserializer to a given word
boundary. When the word aligner operates in bit-slip mode, the word aligner slips a
single bit for every rising edge of the bit slip control signal.Table 13–16 describes the
word aligner and bit-slip parameters.
Table 13–14. 8B/10B Encoder and Decoder Parameters
Parameter Range Description
Enable TX 8B/10B encoder On/Off
When you turn this option On, the PCS includes the 8B/10B
encoder.
Enable TX 8B/10B disparity
control
On/Off
When you turn this option On, the PCS includes disparity control
for the 8B/10B encoder. You force the disparity of the 8B/10B
encoder using the
tx_forcedisp
and
tx_dispval
control
signal.
Enable RX 8B/10B decoder On/Off
When you turn this option On, the PCS includes the 8B/10B
decoder.
Table 13–15. Rate Match FIFO Parameters
Parameter Range Description
Enable RX rate match FIFO On/Off
When you turn this option On, the PCS includes a FIFO to
compensate for the very small frequency differences between the
local system clock and the RX recovered clock.
RX rate match insert/delete +ve
pattern (hex)
User-specified
20 bit pattern
Specifies the +ve (positive) disparity value for the RX rate match
FIFO as a hexadecimal string.
RX rate match insert/delete -ve
pattern (hex)
User-specified
20 bit pattern
Specifies the -ve (negative) disparity value for the RX rate match
FIFO as a hexadecimal string.
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