Xilinx LogiCORE Endpoint v2.4, User Manual

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Ethernet AVB Endpoint User Guide www.xilinx.com 49
UG492 September 21, 2010
Core Interfaces
AV Traffic Interface
AV Traffic Transmitter Path Signals
Table 5-4 defines the core client-side AV traffic transmitter signals, used to transmit data
from the AV client logic into the core. All signals are synchronous to the MAC transmitter
clock,
tx_clk
, which must be qualified by the corresponding clock enable,
tx_clk_en
(see “Clocks and Resets” ).
legacy_rx_frame_good Output Asserted at the end of frame reception to
indicate that the frame should be
processed by the MAC client.
legacy_rx_frame_bad Output Asserted at the end of frame reception to
indicate that the frame should be
discarded by the MAC client: either the
frame contained an error, or it was
intended for the PTP or AV traffic
channel.
legacy_rx_filter_match[7:0] Output This output is only present when the
“MAC Header Filters” are present (when
the core is generated in “Standard CORE
Generator Format” ).
When present, each bit in the bus
corresponds to one of the unique
“Legacy MAC Header Filters.” A bit is
asserted, in alignment with
legacy_rx_data_valid
signal, if the
corresponding filter number obtained a
match.
Table 5-3: Legacy Traffic Signals: Receiver Path
Signal Direction Description
Table 5-4: AV Traffic Signals: Transmitter Path
Signal Direction Description
av_tx_data[7:0] Input Frame data to be transmitted is supplied on this
port
av_tx_valid Input A data valid control signal for data on the
av_tx_data[7:0]
port
av_tx_done Input Asserted by the AV client to indicate that further
frames, following the current frame, are/are not
held in a queue.
av_tx_ack Output Handshaking signal asserted when the current
data on
av_tx_data[7:0]
has been accepted.