
Chapter 11: Deterministic Latency PHY IP Core 11–15
Data Interfaces
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
Table 11–12 describes the signals in the Avalon-ST output interface. These signals are
driven from the PCS to the MAC. This is an Avalon source interface
Table 11–13 shows the signals within
rx_parallel_data
that correspond to data,
control, and status signals.
Table 11–12. Avalon-ST RX Interface
Signal Name Direction Description
rx_parallel_data[(<n><d>)-1:0]
Output
This is RX parallel data driven from the Deterministic Latency PHY
IP Core. The ready latency on this interface is 0, so that the MAC
must be able to accept data as soon as the PHY comes out of
reset. Data driven from this interface is always valid. Refer to
Table 11–13 for the signals that correspond to data, control, and
status signals.
rx_clkout[<n>-1:0]
Output This is the clock for the RX parallel data source interface.
rx_datak[(<n>(<d>/<s>)-1:0]
Output
Data and control indicator for the source data. When 0, indicates
that
rx_parallel_data
is data, when 1, indicates that
rx_parallel_data
is control.
Table 11–13. Signal Definitions for rx_parallel_data with and without 8B/10B Encoding
TX Data Word Description
Signal Definitions with 8B/10B Enabled
rx_parallel_data[9:0]
RX data bus
rx_parallel_data[10]
Synchronization status
rx_parallel_data[11]
Disparity error
rx_parallel_data[12]
Pattern detect
rx_parallel_data[14:13]
The following encodings are defined:
■ 2’b00: Normal data
■ 2’b01: Deletion
■ 2’b10: Insertion (or Underflow with 9’h1FE or 9’h1F7)
■ 2’b11: Overflow
rx_parallel_data[15]
Running disparity value
Signal Definitions with 8B/10B Disabled
rx_parallel_data[9:0]
RX data bus
rx_parallel_data[10]
Synchronization status
rx_parallel_data[11]
Disparity error
rx_parallel_data[12]
Pattern detect
rx_parallel_data[14:13]
The following encodings are defined:
■ 2’b00: Normal data
■ 2’b01: Deletion
■ 2’b10: Insertion (or Underflow with 9’h1FE or 9’h1F7)
■ 2’b11: Overflow
rx_parallel_data[15]
Running disparity value
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