User guide

Chapter 15: Cyclone V Transceiver Native PHY IP Core 15–13
Standard PCS Parameters
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
f For more information refer to the 8B/10B Decoder in Single-Width Mode, 8B/10B Decoder
in Double-Width Mode and 8B/10B Decoder sections in Transceiver Architecture in
Cyclone 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 15–15 describes the rate
match FIFO parameters.
f For more information refer to the Rate Match FIFO section in Transceiver Architecture in
Cyclone 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 15–16 describes the
word aligner and bit-slip parameters.
Table 15–14. 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 15–15. 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.