PCI-6534 receives data to clock twice

I have a simple test developed in place to check the operation of the card PCI-6534.  A written test generator a double-ended (hi-lo) word of 16 bits of zeros with one being bitshifted to the left (MSB).  It is sent to a custom Board that converts the double signal over single-ended and then sends the map of PCI-6534.

Something like this:

0000000000000001

0000000000000010

0000000000000100

0000000000001000

0000000000010000

etc...

I have two different computers and each has a PCI 6534 installed with exactly the same configuration accept the driver.  Computer 1 PCI-6534 driver version 1.12.0f0 (circa 2006).  Computer 1 shows the diagram above as expected.  Computer 2 a driver 2.0.0f0 (circa 2007).  2 computer shows the diagram below:

0000000000000001

0000000000000001

0000000000000010

0000000000000010

0000000000000100

0000000000000100

0000000000001000

0000000000001000

0000000000010000

0000000000010000

So, it looks like 2 computer gets the same data on the top and bottom of a clock cycle.

I was about to check the clock seen by 6534 on computer 1 against 2 computer the data generator trial to show the difference.  However, in doing so, I discovered that now 2 computer shows:

0000000000000001

0000000000000010

0000000000000100

0000000000001000

0000000000010000

I can't reproduce the problem even if I ask the question!

Any ideas?

Thank you!

We have two different vintages of differential boards.  It turns out that the newer boards have a slightly different flavor of the chips that the older 26LS32.  When we swapped the chips on the latest map with those of the former, we were able to solve the problem.

So, with the non-functional chips installed, if we turn the clock low slow reeeaal, we can get multiple samples of data such as the differential line noise is enough that she takes back as clock.  If we turn up to, say, 6 MHz all right.  It is because at that time, the clock runs at a higher frequency than the noise and overclocking the card.

I still have yet to understand what the parameters are new chips really are the root cause of the problem, but it works.

-Shrew

Tags: NI Hardware

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