----- Original Message -----
From: "Laurens Holst" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 19, 2000 10:16 AM
Subject: Re: VHDL source codes
> > > > Does anybody know if there are free-Z80/R800 VHDL source code?
> > >
> > > What the hell is VHDL?
> >
> > VHDL stands for:
> > Very high speed
> > Hardware
> > Description
> > Language
>
> No, it stands for:
> VHSIC
> Hardware
> Description
> Language,
>
> and in this VHSIC stands for
> Very High Speed Integrated Circuit.
>
>
> > That's a language used to develop hardware, i.e. electronic circuits,
> > instead of using the good and old schematic diagrams.
>
> Yes, you can create your own chips (IC's) with it, using PLD's
(Programmable
> Logic Devices), or more specificly: FPGA's (dunno what it stands for).
It stands for Field Programmable Gate Array. There are luxurious versions
which you can program in-circuit.
So you make a circuit with a CPU and ROM/RAM and all the (digital) rest can
reside inside this FPGA. The functions of the FPGA will be loaded by the CPU
from ROM, actually you rebuild the circuit after every power-up. Altera
makes these things ("stoeptegels", with 200+ pins)
>
> Until there were PLD's, the only way to do this (not being a big hardware
> company) was using a CPU in combination with an EPROM.
>
> PLD's are a much nicer and much more user-definable solution.
>
Greetz
Patrick
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