hardware timed digital input and output 6534

[hedgy]

Hello,

I need to read data from a SRAM chip and I am using a 6534 and a HSDIO 32. I use 6534's port2 for the control lines for the SRAM (task name "EMI control"),  6534's port0 and 1 for reading the 16-bit wide data word from hte SRAM (task neme "SRAM address"), and HSDIO32's port 0 and 1 to write the 16-bit wide address word to the SRAM (task name "SRAM data").

I need to read and write those lines synchronously to get meaningful data. In particular I need to implement the timing diagram attached below.

So I thought I could create the digital waveforms for the EMI control and the SRAM address and write them synchrounously using the same clock. AT the same time, I have a read tak go "look at the data" every 2.5 samples sent to the DO.

I am having lots of problems: I'm not sure how to have all read and write tasks to start at the same time, I don't understand how to ensure I read at the right time, I get all sort of errors (including one without description...???)

I am attaching my VI too....which is not working...

Very grateful for ANY help...

[Jason_D]

Hedgy,

Have you taken a look at the example program called "Multi-Function-Synch Dig Read Write With Counter.vi."  This VI shows you you can use a counter to ensure all of your tasks are synchronied.  What is "Create Address one.VI"?  It is missing from the VI.  Can you try to reduce your application to specific problems?

[hedgy]

No I didn't look at it becasue it wouldn't work with my hardware.  But I went and looked at it, and maybe it is worthwhile to use a different board and use the counters.  I am looking at PCI-6254..   

In the mean time, I could properly run the code I posted with simulated boards, but not with the real ones, which cause an 'Internal software error' requiring to call NI.  I am working with somebody from support to understand what the issue is.

Thanks for the suggestion, though.