Re: MPC555 speed versus PentiumMMX

Hi Seth,

--- In [email protected], "surgevw" <surgevw@y...> wrote:
> When I got the sales pitch from Mathworks of Natick, they didn't 
know.
> At that point they didn't understand what I was trying to do (nor 
did
> I, exactly). When I get the model done, I will get an eval version 
and
> try it. 

Ok, sounds good.

> I can tell you right now that the integral term in a PID
> controller eats clock cycles on the Pentium, and I am not sure why. 

Is your model running with discrete or continuous time?   Continuous 
time imposes significant overhead on the real-time system.

Thanks,

Jon.

> I
> am curious to see how a 56MHz MPC565 compares with the more
> conventional Simulink model and the SimMechanics inverse kinematics 
model.
> 
> Thanks,
> 
> Seth
> 
> 
> --- In [email protected], "mworksjjf" <jfielder@m...> wrote:
> > Hi Seth,
> > 
> > > I trying to get a handle on the relative
> > > performance of a MPC 555 or 565 
> > 
> > You should be able to clock the MPC565 faster than the MPC555 - 
up to 
> > 56 MHz.
> > 
> > > with respect to an early Pentium,
> > > specifically a 266 MMX unit with 66MHz FSB. 
> > 
> > We're not sure exactly how these will compare for your 
application.
> > 
> > Please contact your local MathWorks office and request an 
evaluation 
> > of the Embedded Target for Motorola MPC555.   It is a straight 
> > forward process to re-target your model from xPC to MPC555.
> > 
> > If required, your local MathWorks office will be able to get in 
touch 
> > with the development team to determine if any further 
optimisations 
> > can be applied.
> > 
> > Best regards,
> > 
> > Jon Fielder
> > Embedded Targets Development
> > The MathWorks Ltd.




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