Bitcoin Forum
December 13, 2017, 11:05:43 PM *
News: Latest stable version of Bitcoin Core: 0.15.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: DIY PCB Board for home-made dev kit  (Read 2536 times)
senseless
Hero Member
*****
Offline Offline

Activity: 565



View Profile
March 18, 2013, 01:36:09 PM
 #1


I was wondering if some insightful minds might be able to tell me what sort of costs I would be looking at to produce a single PCB similar to this: http://www.openmobilefree.net/?p=1839

I'm able to obtain various fpgas used for relatively cheap (nice chips). I wanted to build a dev board that had an onboard jtag, usb, power, and 50mhz clock. I wanted the remaining unused FPGA pins to be available for re purposing later on (as seen in the site above). My problem is that the chips will be in different sizes, sockets, layouts. It shouldn't be very hard to route the 50mhz GPIO clock and jtag to where they're supposed to go. But that requires a completely new board. Would it be possible to do a base design then quickly change the design and print 4 or 5 boards at low cost depending on the pin-out?



1513206343
Hero Member
*
Offline Offline

Posts: 1513206343

View Profile Personal Message (Offline)

Ignore
1513206343
Reply with quote  #2

1513206343
Report to moderator
1513206343
Hero Member
*
Offline Offline

Posts: 1513206343

View Profile Personal Message (Offline)

Ignore
1513206343
Reply with quote  #2

1513206343
Report to moderator
1513206343
Hero Member
*
Offline Offline

Posts: 1513206343

View Profile Personal Message (Offline)

Ignore
1513206343
Reply with quote  #2

1513206343
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1513206343
Hero Member
*
Offline Offline

Posts: 1513206343

View Profile Personal Message (Offline)

Ignore
1513206343
Reply with quote  #2

1513206343
Report to moderator
Luno
Sr. Member
****
Offline Offline

Activity: 476


Current balance: 00$$/00BTC


View Profile
March 18, 2013, 01:49:46 PM
 #2

I guess that you looked into it, but it is strange that there are no development PCB's for a specific type of fpga.

You can possible also find PCB art work from the FPGA producers documentation and etch your own generic PCB for that FPGA.





 
 
           ▄████▄
         ▄████████▄
       ▄████████████▄
     ▄████████████████▄
    ████████████████████      ▄█▄                 ▄███▄                 ▄███▄                 ▄████████████████▀   ▄██████████

  ▄▄▄▀█████▀▄▄▄▄▀█████▀▄▄▄     ▀██▄             ▄██▀ ▀██▄             ▄██▀ ▀██▄             ▄██▀                   ██
▄█████▄▀▀▀▄██████▄▀▀▀▄█████▄     ▀██▄         ▄██▀     ▀██▄         ▄██▀     ▀██▄         ▄██▀        ▄█▄          ▀██████████████▄
████████████████████████████       ▀██▄     ▄██▀         ▀██▄     ▄██▀         ▀██▄     ▄██▀          ▀█▀                        ██
 ▀████████████████████████▀          ▀██▄ ▄██▀             ▀██▄ ▄██▀     ▄█▄     ▀██▄ ▄██▀                                       ██
   ▀████████████████████▀              ▀███▀                 ▀███▀       ▀█▀       ▀███▀      ▄███████████████████████████████████▀
     ▀████████████████▀
       ▀████████████▀
         ▀████████▀
           ▀████▀
║║


║║
.
.

║║
██
║║
.
.

║║
██
║║
.
║║


║║
hardcore-fs
Full Member
***
Offline Offline

Activity: 196


View Profile WWW
March 19, 2013, 01:37:44 AM
 #3


I was wondering if some insightful minds might be able to tell me what sort of costs I would be looking at to produce a single PCB similar to this: http://www.openmobilefree.net/?p=1839

I'm able to obtain various fpgas used for relatively cheap (nice chips). I wanted to build a dev board that had an onboard jtag, usb, power, and 50mhz clock. I wanted the remaining unused FPGA pins to be available for re purposing later on (as seen in the site above). My problem is that the chips will be in different sizes, sockets, layouts. It shouldn't be very hard to route the 50mhz GPIO clock and jtag to where they're supposed to go. But that requires a completely new board. Would it be possible to do a base design then quickly change the design and print 4 or 5 boards at low cost depending on the pin-out?


Fail.....
1. You don't route the tracks where they want to go, you route the internal logic to the relevant pins.....
2. EVEN for the same  major part number (lets say xilinx) with the SAME package, the control pins of the FPGA may be routed differently.
3. The power connections are located differently

pull this from Xilinx (ug195.pdf) take a look at the pin differences for package FF1136.

Your 'standard layout' is fantasy, absolutely the MAXIMUM you could get away with, would be a  TWO sided PCB with  BGA matrix & PTH tap off points.
You would then have to HAND place the Inductors/Capacitors, power connections and  then hardwire any I/O clocks you need.

This would be the result:

http://www.chiaki.cc/Pyxis2010/images/pyxis2010-fpgasol2.jpg
http://www.chiaki.cc/Pyxis2010/images/pyxis2010-fpgasol1.jpg


BTC:1PCTzvkZUFuUF7DA6aMEVjBUUp35wN5JtF
senseless
Hero Member
*****
Offline Offline

Activity: 565



View Profile
March 19, 2013, 04:58:56 AM
 #4


I was wondering if some insightful minds might be able to tell me what sort of costs I would be looking at to produce a single PCB similar to this: http://www.openmobilefree.net/?p=1839

I'm able to obtain various fpgas used for relatively cheap (nice chips). I wanted to build a dev board that had an onboard jtag, usb, power, and 50mhz clock. I wanted the remaining unused FPGA pins to be available for re purposing later on (as seen in the site above). My problem is that the chips will be in different sizes, sockets, layouts. It shouldn't be very hard to route the 50mhz GPIO clock and jtag to where they're supposed to go. But that requires a completely new board. Would it be possible to do a base design then quickly change the design and print 4 or 5 boards at low cost depending on the pin-out?


Fail.....
1. You don't route the tracks where they want to go, you route the internal logic to the relevant pins.....
2. EVEN for the same  major part number (lets say xilinx) with the SAME package, the control pins of the FPGA may be routed differently.
3. The power connections are located differently

pull this from Xilinx (ug195.pdf) take a look at the pin differences for package FF1136.

Your 'standard layout' is fantasy, absolutely the MAXIMUM you could get away with, would be a  TWO sided PCB with  BGA matrix & PTH tap off points.
You would then have to HAND place the Inductors/Capacitors, power connections and  then hardwire any I/O clocks you need.

This would be the result:

http://www.chiaki.cc/Pyxis2010/images/pyxis2010-fpgasol2.jpg
http://www.chiaki.cc/Pyxis2010/images/pyxis2010-fpgasol1.jpg



I guess my OP was TL;DR?

I specifically said it would require a different board for each chip with different pin outs. That is what I wanted to know. How much would it cost to change the pin outs between printing but keep the components on board the same. The same jtag, usb, power, clock will work for all of the chips but the chip pin-out is different (As I said). I was wondering what It would cost to create just a few board for each chip.

For instance, I just picked up 3x EP4SE530 for 100$ a pop. If I can put them on boards for 100$ea I can have 1.8GH/s (assuming it has routing available for a full 9 cores) for 200$ea and still have it be repurposable later on when I stop using it for bitcoin mining by having unused pins being available for add-on mods. But later on I might get another chip; so I'd need to re-lay out all the pins in the PCB design so they're routed to the correct pins, print a new pcb, and then use that PCB with my new chips. (At 20-40 watts it's almost as power efficient as an avalon.)

Found this on another thread here: http://www.seeedstudio.com/depot/fusion-pcb-service-4-layers-p-1383.html?cPath=185

But i'd still need to get the components on the board at that point.



Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!