General Technical Discussion

[maheshhegde]

Hi,

      The DATA_SIG is declared in command_signals.vhd.This file is the top file.That is going to ds1wm.vhd.from there this signal is routed to one_wire_io.vhd.I added that code also here.

[joelby · Accepted solution]

In one_wire_io.vhd, you are assigning a value to DATA (which is eventually connected to DATA_SIG):

    DATA <= DOUT when DDIR='1' else "ZZZZZZZZ";

This is the cause of your problem. You've declared DATA as an inout in every module, and are driving it in two places.

The logic in one_wire_io.vhd looks like you're trying to infer a tristate IO buffer. Normally you would connect this to a top level pin - you wouldn't try to use tristate logic internally.

[maheshhegde]

Hi joelby,

                  Yes you are right.Well catch.Thanks.Problem solved.

[javo0112]

Hi maheshhegde

 I am using the DS1WM to comunicate to a temperature sensor 18B20. but i am having the same problem:

Multi-source in Unit <owtemp> on signal <DATA<7>>; this signal is connected to multiple drivers.

Could you tell me how did you fix this?

i have a machine state that drives the datta buffer but i was putting a "z" state when there was no data to transmit to the module DS1WM.  so that its wrong , isnt it? 

Thank you 

Javier Balam

[maheshhegde1988]

Hello Javo,

Intially I tried with DS1WM code to read and write of 1-Wire(Transducer).

After that i am not able to communicate with this chip using DS1WM.

So i left that path.(Communicating 1 Wire using DS1WM).

I wrote my own code to communicate with 1-Wire.

So i don't have much knowledge on DS1WM.

[javo0112]

well i think i will try split that bus in two separate bus: one for input and the other for output.

if that doesnt work, i will have to make my own interface too .

thanks for taking the time to answer me