This issue is primarily due to incorrect handling of front padding coefficient data in System Generator while driving the FIR C-Model.
To work around the issue for the FIR Compiler where the reload coefficient feature is enabled and it is based on co-efficient structure, do the following:
Eliminate the single/multiple delay introduced during System Generator simulation by disabling Hybrid Simulation flow of FIR compiler block.
Hybrid simulation support on FIR Compiler block can be disabled by updating the file located at:
For example by changing
simulation_type = 'hybrid_sim'
simulation_type = 'xsim'
This has been resolved in Vivado System Generator 2013.3.