FPGA and high impedance (is it 1 or 0)
Hi,
I'm making a processor on an FPGA. Code:
__________________ Problem: Lets say the controller gives out a number that noone is assigned? What I'm thinking is for each function to send a signal of logic high back to the controller saying Quote:
Will "active" viewed by the controller be a 1 or a 0? And will it be reliable. Perhaps another design? Thanks |
Does make not specify output for undefined inputs? It seems that is what you are asking, what is output for input without specified output.
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The design I would use to interface a controller with other function blocks would be
Code:
__________________ :) EDIT: High impedance is usually "1" (output with an open collector transistor), ie, if there's nothing on the bus, it holds "1", but it goes to "0" if any other signal in that bus goes to "0". |
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