Bitcoin Forum
October 24, 2017, 02:48:25 AM *
News: Latest stable version of Bitcoin Core: 0.15.0.1  [Torrent]. (New!)
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Cyclone V, want to increase speed. How?  (Read 966 times)
magnusha
Newbie
*
Offline Offline

Activity: 5


View Profile
September 03, 2013, 08:04:54 AM
 #1

Hello!

I have a Terasic SocKit board with a Cyclone V FPGA. I have compiled and programmed the FPGA with the open source code from this forum. The FPGA is running nicely at 50MH/s. But I want to increase the MH/s. Can the Cyclone V handle more than 50MH/s without any cooling? I put my finger on it when it have going on for half an hour and the die was not that hot. How much can I speed up before it is dangerous? And the last thing, where in the code do I increase the speed?

Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1508813305
Hero Member
*
Offline Offline

Posts: 1508813305

View Profile Personal Message (Offline)

Ignore
1508813305
Reply with quote  #2

1508813305
Report to moderator
J35st3r
Full Member
***
Offline Offline

Activity: 196



View Profile
September 03, 2013, 09:24:39 AM
 #2

Provided the chip does not get too hot to touch for several seconds (around 60C which will be <80C die temperature) you should be fine.

HOWEVER you should also check the temperature of the onboard voltage regulators. These should also not be allowed to get too hot to touch. The DE0-Nano board was notorious for overheating its regulators when running bitcoin miners, perhaps Teresic have improved the design for the SocKit board, but best to check for sure.

You can ramp the speed up until it starts getting hot, or until the hash error rate starts to rise (from zero!). Speed is set by the multiplier/divider  settings in main_pll.v

BTW did you get that board for $99 on the Arrow training program, or pay full price ($249, still a bargain IMHO)? Are they available on general sale yet (last I saw was a 2 month backorder)?

1Jest66T6Jw1gSVpvYpYLXR6qgnch6QYU1 NumberOfTheBeast ... go on, give it a try Grin
magnusha
Newbie
*
Offline Offline

Activity: 5


View Profile
September 03, 2013, 09:31:33 AM
 #3

Thx for answer. Which one of the multiplier/divider should i adjust? I have not bought it, I'm only testing it from my school  Wink
J35st3r
Full Member
***
Offline Offline

Activity: 196



View Profile
September 03, 2013, 09:49:08 AM
 #4

Thx for answer. Which one of the multiplier/divider should i adjust? I have not bought it, I'm only testing it from my school  Wink

Lucky school, it looks like a nice dev board. The PLL output clock is simply the input clock speed (usually 50MHz on the Terasic boards, but you should check the documentation) multiplied by "clk0_multiply_by" and divided by "clk0_divide_by". Pretty simple really. The fpgaminer defaults are 5 and 5, giving 50MHz. So for 100MHz you'd use 10 and 5, while for 75MHz use 15 and 10. There are limits to the range (255 I think, so nothing to worry about normally).

Have fun. And ask permission from your school before setting up a mining botnet, you wouldn't want to get into trouble  Wink

1Jest66T6Jw1gSVpvYpYLXR6qgnch6QYU1 NumberOfTheBeast ... go on, give it a try Grin
magnusha
Newbie
*
Offline Offline

Activity: 5


View Profile
September 03, 2013, 11:18:47 AM
 #5

What speed do you think is safe before the die gets to hot?
J35st3r
Full Member
***
Offline Offline

Activity: 196



View Profile
September 03, 2013, 11:28:40 AM
 #6

What speed do you think is safe before the die gets to hot?

You'll just have to take it slowly and push the speed up by say 10MHz at a time. The limitation is more likely to be the power regulators rather than the fpga, but I'm not familiar with the one used in the SocKit so as to be able to give an estimate. Talk to your teachers if you are in any doubt.

1Jest66T6Jw1gSVpvYpYLXR6qgnch6QYU1 NumberOfTheBeast ... go on, give it a try Grin
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!