User`s guide

Configuring Simulink for DSP Systems
2-13
Performance-Related Settings
A number of the settings in the dspstartup M-file are chosen to improve the
performance of the simulation:
•
'SaveTime' is set to 'off'
When 'SaveTime' is set to 'off', Simulink does not save the tout time-step
vector to the workspace. The time-step record is not usually needed for
analyzing discrete-time simulations, and disabling it saves a considerable
amount of memory, especially when the simulation runs for an extended
period of time. To enable time recording for a particular model, select the
Time check box in the Workspace I/O panel of the Simulation Parameters
dialog box (shown below).
•
'SaveOutput' is set to 'off'
When 'SaveOutput' is set to 'off', Simulink Outport blocks in the top level
of a model do not generate an output (
yout) in the workspace. To reenable
output recording for a particular model, select the
Output check box in the
Workspace I/O panel of the Simulation Parameters dialog box (above).
•
'InvariantConstants' is set to 'on'
When 'InvariantConstants' is set to 'on', Simulink precomputes the
values of all constant blocks (e.g., DSP Constant, Constant Diagonal Matrix)
at the start of the simulation, and does not update them again for the