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Altera_Forum's avatar
Altera_Forum
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16 years ago

about EPM240 high impedance output

im now encounter a problem with EPM240 high impedance output,it seems like the io port has connected a low value R to the ground that drop down the voltage provided by other signal on the bus. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

yes, it means that a tri state buffer is used for the output where adjlevel enables or disables this buffer with a permanent 0 or 1 on its input, but it doesn't say wheter or not some optional bus hold circuit, pull up, clamping diode, ... is added.