Re: Tristate buffer

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Posted by Michael van Dam on February 23, 1998 at 13:11:28:

In Reply to: Re: Tristate buffer posted by Maciej Kalisiak on February 20, 1998 at 22:16:51:

: : How would you implement tristate buffer. It seems that the
: : Maxplus2 is not supporting 'Z' for high impedence.
: : bhupinder

: I would like to second that question. I tried using the TRI function as well
: as one of the LPM tristate buffers, but I am getting nowhere. It is always
: spitting back some obscure, "unknown" errors back at me no matter what I do.
: So:

: How DO you implement a tristate buffer in Altera?

One option is to use the 'INOUT' mode for the signal. This
will work on its own, but you may prefer to use the 'TRI'
primitive because it has the 'output enable' functionality
built in. (Once you set the pin to be 'INOUT', your
mysterious errors *should* go away.)

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Comments:
: : : How would you implement tristate buffer. It seems that the : : : Maxplus2 is not supporting 'Z' for high impedence. : : : bhupinder : : I would like to second that question. I tried using the TRI function as well : : as one of the LPM tristate buffers, but I am getting nowhere. It is always : : spitting back some obscure, "unknown" errors back at me no matter what I do. : : So: : : How DO you implement a tristate buffer in Altera? : : One option is to use the 'INOUT' mode for the signal. This : will work on its own, but you may prefer to use the 'TRI' : primitive because it has the 'output enable' functionality : built in. (Once you set the pin to be 'INOUT', your : mysterious errors *should* go away.)

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