Re: BG and BR are bidirectional?

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Posted by Michael van Dam on March 10, 1998 at 13:20:55:

In Reply to: BG and BR are bidirectional? posted by Wisnu Wurjantara on March 09, 1998 at 23:54:58:

: In the lab handout, both BR and BG are shown to be
: bidirectional pins. Is this really necessary?
: The DMA engine should be able only to drive BR, so BR
: should be a dedicated output pin. Simmilarly, I think
: the DMA engine should be able only to detect BG, not
: drive it, so BG should be a dedicated input pin.
: Am I missing something?

BG should only be an input pin. BR and BGACK should be outputs only,
but they need to be driven by a TRI-STATE buffer so that other devices
on the bus can also use them.

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