SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
A block diagram of the VCP processing unit is shown on Figure 32-6. The state metrics unit performs the Viterbi forward recursion using branch metrics as inputs, and updates the states metrics for all states (Add/Compare/Select or ACS operations) at every trellis stage. The state metrics memory is not accessible by the DSP. The traceback unit performs the Viterbi backward recursion and generates harddecisions or soft-decisions. The traceback memories are not directly accessible by the DSP.
Figure 32-6 Viterbi Processing Unit