RMW transfer with VME-MXI-2

[PaoloG]

Is it possible to perform a RMW transfer using the VME-MXI-2 ?
I mean, to read a data from a VME board, change the data in LabVIEW
(es. PXI controller) and to write the data back. During this 3 operations
the Address Strobe line must be low.

If yes, how ? I saw that the DMA registers SCRx and DCRx have a flag called
Blocked, but can I use it to control the AS line?

Thank you

[AlessioD]

Paolo,

we are currently handling this question through the support team in Italy. You will receive the information from one of our AEs via e-mail

AlessioD
National Instruments

[AlessioD]

Performing a Read-Modify-Write Cycle is one low-level task that can be implemented using NI Hardware. Since a correct implementation could depend on the platform the cycle is to be used on, we kindly encourage users to get in touch with their local NI Engineers. Our team will be available for providing detailed information and appropriate examples.
Best regards,

AlessioD
National Instruments

[mdauphin]

I have the same question, I contact the french NI support, but they don't give me an anwser. Where can I found some code sample. Thanks

[Sputnikrent]

Hi mdauphin,

It looks like you would like to perform low/register level programming with the VME-MXI-2. One way you can do this is through the VISA Interactive Control. You can do this by using the Register I/O pane. There is more information about this here

LabVIEW also ships with some example code that you may use. You can open the example finder by going to Help > Find Examples. Once there, browse to Hardware Input and Output > VISA > Low Level Register Access. There is also a High Level Register Access example.

[mdauphin]

Thanks Rasheel for you anwser, but I performe low level Register Access with NI-VXI API and VISA API in C programming. But I must do an RMW cycle, with keep AS down.

[Sputnikrent]

Hi mdauphin,

So you'd like to control the Address Strobe to low, and then do an RMW cycle? I will look into this and let you know what I find.