From: "Jamie Gore"
References: <email@example.com> <7dJl9.14932$CN2.firstname.lastname@example.org>
Subject: Re: What important issue about interfacing ISA I must focus on?(open-collector,tri-state,totem-pole,open-drain)
Date: Mon, 30 Sep 2002 21:08:21 -0700
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I have been to the opencore site myself a time or two and was wondering if
you could help me.
When you say get a free pci core there, are you refering to an actual chip?
How do you go about getting one?
"Richard Everett" wrote in message
> He could go to opencores.org and check out the free pci core there.
> "Nico Coesel" wrote in message
> > email@example.com (Ru-Chin Tsai) wrote:
> > >I want to interface FPGA device with ISA. I have no any design
> > >experience about interface LPT, ISA, PCI. I fear to damage PC
> > >motherboard or FPGA if I directly connect pins between FPGA and ISA
> > >without concerning the output
> > >type(open-collector,tri-state,totem-pole,open-drain). Can every
> > >experienced designer give me the design issue and suggestions?
> > Start with PCI, buy a ready-to-go core and you will be okay.
> > There are 2 reasons to stay away from ISA:
> > -ISA is not standard. Every PC chipset has it's own way of handling
> > ISA which translates in to small differences in timing.
> > -ISA is considered obsolete. If you want to turn this project into a
> > product, you'll need PCI.
> > >Does I must concern the ISA digital output type from
> > >motherboard(signal send to FPGA)? Will anything damage the FPGA
> > >device?
> > If you use a 5V tolerant device, you'll be okay. Check if your FPGA
> > can handle a shorted pin. Connecting 2 outputs to each won't hurt
> > much. In most cases it will prevent the PC from booting so you will
> > see there is something wrong soon enough.
> > >Oppositely,how do I decide to deal with the output from FPGA as which
> > >type output(open-collector,tri-state,totem-pole,open-drain), and then
> > >connect to ISA input pin from damaging the motherboard?
> > Checking your design with an experimental setup (i.e. simulate the
> > address bus with dip-switches or use an old motherboard) is a good
> > idea.
> > --
> > Reply to nico@nctdevpuntnl (punt=.)
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