1. Home
  2. Electronics Design
  3. PIC to ISA bus interfacing weird problem

PIC to ISA bus interfacing weird problem

Hi all,

I am interfacing pic microcontroller (pic18f452) to FDC37c672 from SMSC. FDC37c672 has some UART and IrDA capabilities which I want to explot.

It has an ISA bus interface. I am able to read the registers from the FDC37C672. But for some reason I am unable to write to the FDC37C672 using PIC using C. So, I connected it to Computer's ISA slot and wrote code Visual C++. On PC, I am able to read and write to FDC37C672. I am not sure what is wrong with my circuit. Did anyone ever face any problem like this. I want to learn from your experience. Please feel free to suggest me. I can send you schematics of my PCB board if you are interested in.

Thanks, Kalyan

Reply to
kalyan
Loading thread data ...

Are you decoding the address properly? I don't know anything about your device, but you have to make sure your IORD or MEMRD lines are asserted and also the AEN is in the appropriate state. Get out the scope and look! Should be a lot easier with your PIC interface than on an ISA bus where there's all sorts of other traffic to worry about.

Paul Burke

Reply to
Paul Burke

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.