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AR# 31275

LogiCORE Viterbi Decoder v6.2 - How is the latency for the core determined?

Description

How is the latency for the core determined?

Solution

The latency of the core depends primarily on the traceback and constraint lengths. The latency is given by the number of symbol inputs between DATA_IN, validated by CE, or ND in the serial case, and the decoded data result output on DATA_OUT validated by RDY.

The general equation is as follows:

Latency = n*traceback_length+constraint_length where n = 2 for reduced latency and 4 for all other cases

The total latency figure is dependent on other factors like Best State, Speed Optimization, etc., in order to get the total latency the decoder should be simulated.

AR# 31275
Date Created 02/02/2009
Last Updated 12/15/2012
Status Active
Type General Article