
11–14 Chapter 11: Deterministic Latency PHY IP Core
Data Interfaces
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Data Interfaces
Table 11–10 describes the signals in the Avalon-ST input interface. These signals are
driven from the MAC to the PCS. This is an Avalon sink interface.
f For more information about the Avalon-ST protocol, including timing diagrams, refer
to the Avalon Interface Specifications.
Table 11–11 shows the signals within
tx_parallel_data
that correspond to data,
control, and status signals.
Table 11–10. Avalon-ST TX Interface
Signal Name Direction Description
tx_parallel_data[(<n><w>)-1:0]
Input
This is TX parallel data driven from the MAC. The ready latency on
this interface is 0, so that the PHY must be able to accept data as
soon as it comes out of reset. Refer to for definitions of the
control and status signals with 8B/10B encoding enabled and
disabled. Refer to Table 11–11 for the signals that correspond to
data, control, and status signals
.
tx_clkout[<n>-1:0]
Output This is the clock for TX parallel data, control, and status signals.
tx_datak[(<n>(<d>/<s>)-1:0]
Input
Data and control indicator for the received data. When 0, indicates
that
tx_parallel_data
is data, when 1, indicates that
tx_parallel_data
is control.
Table 11–11. Signal Definitions for tx_parallel_data with and without 8B/10B Encoding
TX Data Word Description
Signal Definitions with 8B/10B Enabled
tx_parallel_data[7:0]
TX data bus
tx_parallel_data[8]
TX data control character
tx_parallel_data[9]
Force disparity, validates disparity field.
tx_parallel_data[10]
Specifies the current disparity as follows:
■ 1’b0 = positive
■ 1’b1 = negative
Signal Definitions with 8B/10B Disabled
tx_parallel_data[9:0]
TX data bus
tx_parallel_data[10]
Unused
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