Strange timing on pin writes

[euggersh]

 I'm seeing some strange behaviour writing to pins on a PSoC 5LP.  I'm writing a 6-bit value to six pins grouped as a bus.  I'm then writing a 1 followed by a 0 to a separate pin.  The changes on some of the bits within the bus don't always happen concurrently.  In fact, some of them occur *after* the strobe is cycled.

   

Here's the code I'm using:

   

P_Write(data);
CyDelayUs(1);
STB_Write(1);
STB_Write(0);

   

Here's what the resulting timing looks like.  Anyone know what's going on?

           

[Bob_Marlowe]

It is a bit difficult to judge from a picture what the cause of the strange behavior is. Can you post your complete project, so that we all can have a look at all of your settings? To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file (do NOT use chrome, that still may not work).

       

Bob
 

[ETRO_SSN583]

First the Saleae logic analyzer way too slow to get accurate timing.

   

Although display you show is relatively (within 135 nS) correct.

       

Consider a scope and look at the trigger vs a specific channel. In fact

   

you can trigger DSO on a pin changing before strobe as a condition.

   

Or on a condition of excessive delay of a pins response.

       

What is used as the trigger, the STB ?

       

Regards, Dana.