Altera Viterbi Compiler Bedienungsanleitung Seite 35

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Signal
Avalon-ST
Name
Direction Description
out_data data Output
In Qsys systems, this Avalon-ST-compliant data bus
includes all the Avalon-ST output data and configuration
signals. The signals are in the following order from MSB to
LSB:
Numerr
BestAdd
BestMet
Normalizations
Decbit
Configuration Signals
Signal Name Description
ber_clear Reset for the BER counter. Only for the BER block option.
bm_init_state[(L-1):1] Specifies the state in which to initialize with the value from the bm_
init_value[] bus. All other state metrics are set to zero. the IP core
latches bm_init_state when sink_sop is asserted. Hybrid architec‐
ture only
bm_init_value[(L-1):1]
Specifies the value of the metric that initializes the start state. All other
metrics are set to 0. bm_init_value must be larger than (L × 2
(softbits
1)
). the IP core latches bm_init_value when sink_sop is asserted.
Hybrid architecture only
sel_code[log2(Ncodes):1] Selects the codeword. ’0’ selects the first codeword, ‘1’ selects the
second, and so on. The bus size increases according to the number of
codes specified. The IP core latches sel_code when sink_sop is
asserted.
state_node_sync[log2(Nmax):1]
Specifies the node synchronization rotation to rr.
The IP core latches state_node_sync signal when sink_sop is
asserted. Available only when you turn on Node Sync.
tb_length[] Traceback length. The maximum width of tb_length is equal to the
maximum value of parameter v. The IP core latches tb_length input
when sink_sop is asserted. This IP core disables this signal if you select
the continuous optimization: you must then remove it from the
testbench.
UG-VITERBI
2014.12.15
Configuration Signals
3-17
Viterbi IP Core Functional Description
Altera Corporation
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