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Question about VMEbus Backplane design.

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kkeeley

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Hi,

I'm working on a home project of mine and I wish to create a VMEbus based backplane. I managed to get a copy of the VMEbus specs and this has been very handy so far.

My question is should all the Control, Address and Data lines have terminating resistors on both ends of them or should only the control signals have the terminating resistors?

If all the address and data lines require terminating resistors as well then there would be a rather large number of resistor packs required to achieve this.

Thanks
Kenneth
 

Thanks for the link hexreader, although I had already seen that site before. I had the feeling the specs ment all lines. I just wanted to confirm it. It looks like around 72 lines need terminating at each end. I guess thats going to be about 288 resistors all up, less when using resistor packs, but still alot of pins.

Thanks for your help.
 

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