Altera Viterbi Compiler Bedienungsanleitung Seite 34

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Signal Name
Avalon-ST
Name
Direction Description
sink_data data Input
In Qsys systems, this Avalon-ST-compliant data bus
includes all the Avalon-ST input data and configuration
signals. The signals are in the following order from MSB to
LSB:
In
State_node_sync
Ber_clear
Sel_code
Tb_type
Tb_length
Tr_init_state
Bm_init_state
Bm_init_value
Eras_symRr
Avalon Source-ST Signals
Signal
Avalon-ST
Name
Direction Description
decbit dat Output The decbit signal contains output bits when source_val is
asserted.
source_eop eop Output End of packet (block) signal. if you select continuous
optimization, this signal is left open and you must remove it
from the testbench.
source_rdy ready Input Data transfer enable signal. The sink interface drives
source_rdy and uses it to control the flow of data across the
interface. ena behaves as a read enable from sink to source.
When the source observes source_rdy asserted on the clk
rising edge it drives, on the following clk rising edge, the
Avalon-ST data interface signals and asserts source_val.
The sink captures the data interface signals on the following
clk rising edge. If the source is unable to provide new data,
it deasserts source_val for one or more clock cycles until it
is prepared to drive valid data interface signals.
source_sop sop Output Start of packet (block) signal. if you select continuous
optimization, this signal is left open and you must remove it
from the testbench.
source_val val Output Data valid signal. The IP core assers source_val high for
one clock cycle, whenever there is a valid output on the
decbit signal.
3-16
Avalon Source-ST Signals
UG-VITERBI
2014.12.15
Altera Corporation
Viterbi IP Core Functional Description
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