Groups | Search | Server Info | Login | Register
Groups > comp.arch.fpga > #10569
| Newsgroups | comp.arch.fpga |
|---|---|
| Date | 2017-12-12 12:10 -0800 |
| References | <2f3344b5-c9b4-4cee-bbf9-bd96efb89497@googlegroups.com> |
| Message-ID | <a7ce2c46-8599-4997-be70-ded4ec7c8022@googlegroups.com> (permalink) |
| Subject | Re: FPGA motherboard for 80386 CPU |
| From | "Rick C. Hodgin" <rick.c.hodgin@gmail.com> |
On Friday, November 10, 2017 at 10:35:44 AM UTC-5, Rick C. Hodgin wrote:
> The 80386DX CPU had 132 pins:
>
> 80386DX and 80386SX pinouts:
> http://www.rfwireless-world.com/images/80386-pin-diagram.jpg
> https://image.slidesharecdn.com/salientfeatursof80386-140822084001-phpapp02/95/salient-featurs-of-80386-14-638.jpg?cb=1408709884
>
> General architecture:
> http://www.nptel.ac.in/courses/Webcourse-contents/IISc-BANG/Microprocessors%20and%20Microcontrollers/pdf/Teacher_Slides/mod8/M8L1.pdf
>
> Of these pins on the DX variant:
>
> 32 pins -- data
> 30 pins -- address
> 4 pins -- byte enables in 32-bit writes
> 1 pin -- Read/write
> 1 pin -- Data/Control
> 1 pin -- Memory/IO
> 1 pin -- Bus mastering lock issued by CPU
> 1 pin -- Bus16 size (16-bit when asserted, normally 32-bit)
> 1 pin -- Next address (for pipelining)
> 1 pin -- Address valid signal
> --
> 73 pins -- For basic I/O
>
> 3 pins -- Math-coprocessor support
> 1 pin -- Ready (or Wait, for bus cycles to complete)
> 2 pins -- Hold and Hold Acknowledge (for bus mastering)
> 2 pins -- Interrupt and Non-masktable Interrupt
> --
> 8 pins -- General coordination with external peripherals
>
> 1 pin -- Reset
> 1 pin -- Double-pumped clock
> --
> 2 pins -- System input
>
> The rest of the pins are unused, go to VSS or VCC. This means that for a
> full 80386 "motherboard" only 83 pins are required to fully support its
> operation, 67 of which are address, data, and data type, leaving really
> only 15 pins of complex operation for a state machine.
>
> -----
> Would anybody be able to help me create this 80386 motherboard using an
> AMD Am386 CPU, which is a static CPU operating from 0 to 40 MHz? I would
> like to get it working with a single-step operation for design validation,
> and then to begin ramping it up.
>
> I figure I'll have an area of ROM which the CPU boots to load, which is a
> tiny real mode program, which begins computing something that can be exam-
> ined by the FPGA to test successful operation. And then move on to more
> complex operations, including a custom microkernel.
Now that the intrusion appears to be over, would anybody like to help me
in preparation for this project?
Specifically, I'd like some help in guiding me toward the type of board
and sockets I'll need. I think I know what to do, but without someone
to say "yay" or "nay" I'm just guessing.
It will need a 132-pin PGA, a custom board which connects into the
three parallel 40-pin adapter board I have for my FPGA. In that way,
the 80386 chip will ride right above the FPGA, with traversing the main
40-pin-to-FPGA connection, and the 80386 board-to-40-pin connection.
80386
=========
|||||||||
===========================
|| || || <=== 3x 40-pin
=======================
|||| <=== Proprietary 120+pin adapter
=====[ FPGA ]==================
The FPGA I have is about 6" square, with the adapter board being about
2" x 3". The custom board I'll build will be about 3" x 3". The total
distance from FPGA to CPU will be about 9".
The Am386 CPU I plan to use is a static part able to run between 0 MHz
and 40 MHz inclusive. I plan to run around 1 MHz to start.
Please offer any advice. Thank you.
--
Rick C. Hodgin
Back to comp.arch.fpga | Previous | Next — Previous in thread | Next in thread | Find similar
FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 07:35 -0800
Re: FPGA motherboard for 80386 CPU rickman <gnuarm@gmail.com> - 2017-11-10 14:46 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 12:19 -0800
Re: FPGA motherboard for 80386 CPU rickman <gnuarm@gmail.com> - 2017-11-10 16:11 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 14:14 -0800
Re: FPGA motherboard for 80386 CPU rickman <gnuarm@gmail.com> - 2017-11-10 18:31 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 15:59 -0800
Re: FPGA motherboard for 80386 CPU rickman <gnuarm@gmail.com> - 2017-11-10 22:15 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 20:16 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-11 10:43 -0800
Re: FPGA motherboard for 80386 CPU lasselangwadtchristensen@gmail.com - 2017-11-10 13:15 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-10 14:02 -0800
Re: FPGA motherboard for 80386 CPU lasselangwadtchristensen@gmail.com - 2017-11-13 08:28 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-13 08:49 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-13 09:33 -0800
Re: FPGA motherboard for 80386 CPU lasselangwadtchristensen@gmail.com - 2017-11-13 11:47 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-13 11:54 -0800
Re: FPGA motherboard for 80386 CPU lasselangwadtchristensen@gmail.com - 2017-11-13 12:06 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-13 12:15 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-21 01:33 -0800
Re: FPGA motherboard for 80386 CPU Richard Damon <Richard@Damon-Family.org> - 2017-12-22 19:23 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-24 14:04 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-20 05:49 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-12 12:10 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-14 06:29 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-28 07:32 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-30 09:54 -0800
Re: FPGA motherboard for 80386 CPU Richard Damon <Richard@Damon-Family.org> - 2017-12-30 15:18 -0500
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-31 00:20 -0800
Re: FPGA motherboard for 80386 CPU Emilian Miron <emilian.miron@gmail.com> - 2017-12-31 07:20 -0800
Re: FPGA motherboard for 80386 CPU "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-12-31 13:52 -0800
csiph-web