
Chapter 7: Interlaken PHY IP Core 7–11
TX and RX Serial Interface
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
TX and RX Serial Interface
Table 7–6 describes the signals in the chip-to-chip serial interface.
PLL Interface
Table 7–6 describes the signals in the PLL interface.
rx_dataout_bp<n>
Input
When asserted, enables reading of data from the RX FIFO. This signal
functions as a read enable. The RX interface has a ready latency of 1
cycle so that
rx_paralleldata
<n>
[63:0]
and
rx_paralleldata<n>[65]
are valid the cycle after
rx_dataout_bp
<n> is asserted.
This output is synchronous to the
rx_coreclkin
clock domain. You
can tie this
rx_dataout_bp<n>
RX FIFO read enable signal to the
inverted logic of the
rx_parallel_data[68]
RX FIFO partially
empty signal using the following assignment statement:
assign rx_dataout_bp[0] =! (rx_parallel_data[68]);
rx_user_clkout
Output
Master channel
rx_user_clkout
is available when you do not
create the optional
rx_coreclkin
.
Table 7–5. Avalon-ST RX Signals (Part 4 of 4)
Signal Name Direction Description
Table 7–6. Serial Interface
Signal Name Direction Description
tx_serial_data
Output
Differential high speed serial output data using the PCML I/O
standard. Clock is embedded in the serial data stream.
rx_serial_data
Input
Differential high speed serial input data using the PCML I/O standard.
Clock is recovered from the serial data stream.
Table 7–7. Serial Interface
Signal Name Direction Description
pll_ref_clk
Input
Reference clock for the PHY PLLs. Refer to the Lane rate entry in the
Interlaken PHY General Options table for required frequencies.
Custom, user-defined, data rates are now supported. However, the
you must choose a lane data rate that results in standard board
oscillator reference clock frequency to drive the
pll_ref_clk
and
meet jitter requirements. Choosing a lane data rate that deviates from
standard reference clock frequencies may result in custom board
oscillator clock frequencies which could be unavailable or cost
prohibitive.
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