Pulses [width, delay, time, trigger}

[the_intern]

Thanks Jennifer. But now a lot more unsolved questions raised for my project.

1. I am using ISA Bus, which is using 40 clocked lines. So what I would like to do is, since 6289 has 32 clocked lines (P0.0, P0.1, ... P0.31), I would connect all ISA Address lines and other timing lines (BCLK, BALE, etc) to 6289, and all Data lines to the 6541. But now, what lines should I connect from 6289 to the 6541 so that both are driving on the same common clock and me being able to actually use both cards at the same time for the ISA Bus?

2. Right now, I am using 24 Clocked lines (out of 32) from the 6289, and have 8 lines left. So instead of using both 6289 and 6541 for controlling my ISA Bus (40 clocked lines), is its posible to use PFI lines as addition and make it posible using only 6289 for ISA Bus?

3. I know that 6289 has 4 Analog Voltage Output, so for 0-6V output, should I use 6289 (one of those 4 lines) or 6541 ? Is 6541 capable of producing 0-6V Analog Output Voltage, if so, what pins refers to that? Seems like they are all digital lines. In other words, which one do you prefer for outputing analog voltage 0-6V ?

Thanks Jennifer. I am learning a lot from you.

[Ryan_M]

the 6541 does not have analog capabilities

if you need to have the 6289 and 6541 running on the same clock then you need to either send a clock to one and use the backplane (RTSI) to route it between the two or split it between the two externally.

[the_intern]

From what card/pin should the RTSI be connected to, and to what pin on the other card? I dont see any RTS pins.

So only CLOCK and RTSI signals need to be taken care of ?

[Jennifer O]

Hi the_intern,

I believe with a little searching on ni.com you will be able to find most of the information you need.  The M-Series user manual should give you a little information on RTSI.  Searching RTSI will bring you to chapter 9.  I encourage you to read up on this functionality.  A general overview is that digital signals can be routed between two boards in the same computer over the RTSI bus.  If you are working with PXI the functionality is built into the bus.  If you are working with PCI a physical cable needs to connect the two (or more) boards that will be sharing the signal.  RTSI is completely separate from the I/O pins on your board(s).

You can get the clock to both boards in several ways, however as the signal gets faster it is important to minimize skew.  This is done by having equal propagation delay.  By routing the signal to one board and exporting the signal through RTSI you can get the signal to both boards with minimal delay.  It does not matter which board you connect to and route from.  Either would produce the same result.

Since the extra 8 lines do not have a clock, they would not be useful in quickly reading or writing an address or data line.  I think you will need to use both boards or choose  board with more clocked I/O

Regards,

Jennifer O.

[the_intern]

So, by using the RTSI bus/cable I don't need any additional wire connection in order to get two/or more cards "communicating" to each other at the same time?

[Jennifer O]

The RTSI cable will enable you to share the clock by exporting it.  The cable physically connects the two boards and no other wires are required to share the clock.  Again, if you are using PXI, RTSI is built in and no cable is required.

You will need to code your application appropriately to make sure that both cards begin at the same time to make sure the data is aligned between the boards.  If you do not start both cards at the same time then it is possible that even though the cards will take or output data at the same time, that they will be shifted by one or more samples.

Regards,

Jennifer O.

[the_intern]

Thanks a lot.

[the_intern]

Jennifer, I definitely need then RTSI cable for my two NI cards. But those two cards are not next to each other. They are separated by 2 PCI slots and plus one RTSI connector is on the "short" card (multifunction DAQ) and other RTSI connector is on the end of the "long" card (Waveform Digitizer). What part number of the RTSI do I need to achieve this ? 

[the_intern]

- On the wavefrom generator card (6541), since I am using all 32 DIO lines, do I need to ground every single GND on that card?

- On the multifunction DAQ, can 4 Analog Output be in range  0-6V ? Also, I am using AO 0 and AO 1, do I need to ground their AO GND (pins 54, 55)

- By using 11 static DIO lines on NI 6509. do I need to ground pins 50 and 100, or are these ground used only if pins 49, and 99 (+5V) are used as well?

Thanks

[the_intern]

One more:

- On the multifunction card (6289), I am using all P0.0 through P0.31, so I am wondering what D GND pins need to be grounded?