Hallo, does anyone has connected 2 FPGA? Which kind of connection have used? Many Thanks Marco
How to connect 2 FPGA?
Started by ●December 7, 2005
Reply by ●December 7, 20052005-12-07
"Marco" <marcotoschi@nospam.it> schrieb im Newsbeitrag news:dn643r$hbo$1@nnrp.ngi.it...> Hallo, > does anyone has connected 2 FPGA? > Which kind of connection have used? > > Many Thanks > MarcoFPGAs are often connected to each other by different means. your question can have no reasonable answers as you are the only person who know WHY you want to connect the FPGA, and the answer to that question is needed in order to decide HOW. It all depends why and what you are going to achive. Antti
Reply by ●December 7, 20052005-12-07
Marco wrote:> Hallo, > does anyone has connected 2 FPGA? > Which kind of connection have used?A bit less cryptic than Antti : You can connect them by one or more parallel wires. You can implement an SPI on both sides, an 8bit parallel bus with Read/Write, or something elese. Rene -- Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
Reply by ●December 7, 20052005-12-07
"Antti Lukats" <antti@openchip.org> wrote in message news:dn6b3a$h6c$01$1@news.t-online.com...> "Marco" <marcotoschi@nospam.it> schrieb im Newsbeitrag > news:dn643r$hbo$1@nnrp.ngi.it... >> Hallo, >> does anyone has connected 2 FPGA? >> Which kind of connection have used? >> >> Many Thanks >> Marco > > FPGAs are often connected to each other by different means. > > your question can have no reasonable answers as you are the only person > who know WHY you want to connect the FPGA, and the answer to that question > is needed in order to decide HOW. It all depends why and what you are > going to achive. > > Antti >I must develop a system with lots of I/O, about 180-190. My chief don't want use BGA (fg320), but pq208... so I thought to connect 2 fpga pq208. I think it'is bad... but there are other chances? Otherwise does exist a BGA adapter for fg320 package to change it into a pq320? Many Thanks Marco
Reply by ●December 7, 20052005-12-07
"Marco" <marcotoschi@nospam.it> schrieb im Newsbeitrag news:dn6f94$l68$1@nnrp.ngi.it...> > "Antti Lukats" <antti@openchip.org> wrote in message > news:dn6b3a$h6c$01$1@news.t-online.com... >> "Marco" <marcotoschi@nospam.it> schrieb im Newsbeitrag >> news:dn643r$hbo$1@nnrp.ngi.it... >>> Hallo, >>> does anyone has connected 2 FPGA? >>> Which kind of connection have used? >>> >>> Many Thanks >>> Marco >> >> FPGAs are often connected to each other by different means. >> >> your question can have no reasonable answers as you are the only person >> who know WHY you want to connect the FPGA, and the answer to that >> question is needed in order to decide HOW. It all depends why and what >> you are going to achive. >> >> Antti >> > > I must develop a system with lots of I/O, about 180-190. My chief don't > want use BGA (fg320), but pq208... > so I thought to connect 2 fpga pq208. > > I think it'is bad... but there are other chances? > > Otherwise does exist a BGA adapter for fg320 package to change it into a > pq320? > > Many Thanks > Marco >ah ok that explains it all. for several reasons the 2 package deal may be better so your chief has hist point on this. if you want to lower cost then the 2 package is probably cheaper both from silicon price, board complexity assembly costs, etc.. but it also makes a little additional 'burden' on the design. but its always like this, to get the production cost a little lower it is needed to invest a little more during design. if you can live with 185 IOs then Altera 1C6 PQ240 has so many ios available! but you need to check the dual purpose pins very carefully. if that is not an options take 2 PQ208 chips and connect some amount of io lines between then, that should be sufficent, you can decide how to implement the interface later. of course you need to partition the design properly so you dont need high speed update over the FPGA intercomm if you are just a few pins short on the PQ208 it may be reasonable to add a low cost microcontroller that both configures the FPGA (saves a penny here) and works as IO extender later Antti
Reply by ●December 8, 20052005-12-08
Hi At a minimum we need to know how much bandwidth and latency you accept/require for the communication between your FPGAs and how much of your FPGAs you intend to dedicate to inter-FPGAs communication. The caracteristics of the FPGA themselves are also welcome. Waiting for your answer, Eric DELAGE, Senior ASIC/FPGA Architect EMail: nospam DOT eric AT gmail DOT com Homepage: http://eric-delage.no-ip.info
Reply by ●December 8, 20052005-12-08
<nospam.eric@gmail.com> wrote in message news:1134033868.487979.128590@g49g2000cwa.googlegroups.com...> Hi > > At a minimum we need to know how much bandwidth and latency you > accept/require for the communication between your FPGAs and how much of > your FPGAs you intend to dedicate to inter-FPGAs communication. The > caracteristics of the FPGA themselves are also welcome. > > Waiting for your answer, > > Eric DELAGE, Senior ASIC/FPGA Architect > EMail: nospam DOT eric AT gmail DOT com > Homepage: http://eric-delage.no-ip.info >Many Thanks in advance! Fortunately I make sure my chief changes his mind toward the use of 2 FPGA. Now we're searching for an adapter for BGA package. I have found this from Interconnect Systems: HiLoTM BGA Socketing Supports Xilinx� Virtex 4 BGA Packages Does anyone has already used it? Could proive feedback? Many and many thanks MArco
Reply by ●December 8, 20052005-12-08
We used sockets on one board. I wouldn't expect to use them in production, the cost if far to excessive. If you can find a place that does BGA assembly you will find it much better. We have had very good success lately with assembly of boards with PBGA packages Simon "Marco" <marcotoschi@nospam.it> wrote in message news:dn927g$gr1$1@nnrp.ngi.it...> > <nospam.eric@gmail.com> wrote in message > news:1134033868.487979.128590@g49g2000cwa.googlegroups.com... > > Hi > > > > At a minimum we need to know how much bandwidth and latency you > > accept/require for the communication between your FPGAs and how much of > > your FPGAs you intend to dedicate to inter-FPGAs communication. The > > caracteristics of the FPGA themselves are also welcome. > > > > Waiting for your answer, > > > > Eric DELAGE, Senior ASIC/FPGA Architect > > EMail: nospam DOT eric AT gmail DOT com > > Homepage: http://eric-delage.no-ip.info > > > > Many Thanks in advance! > > Fortunately I make sure my chief changes his mind toward the use of 2FPGA.> Now we're searching for an adapter for BGA package. > I have found this from Interconnect Systems: HiLoTM BGA Socketing Supports > Xilinx� Virtex 4 BGA Packages > > Does anyone has already used it? Could proive feedback? > > Many and many thanks > MArco > >
Reply by ●December 8, 20052005-12-08
one other point.. if you do use a BGA.. put about 20 pins off to a dual row connector... that will allow you debug pins that can't be accessed. Also look at exposing the bottom of vias 'off-chip'... so you can probe signals to find out what's happening. Simon "Simon Peacock" <simon$actrix.co.nz> wrote in message news:43987565$1@news2.actrix.gen.nz...> We used sockets on one board. I wouldn't expect to use them in production, > the cost if far to excessive. If you can find a place that does BGA > assembly you will find it much better. We have had very good successlately> with assembly of boards with PBGA packages > > Simon > > > "Marco" <marcotoschi@nospam.it> wrote in message > news:dn927g$gr1$1@nnrp.ngi.it... > > > > <nospam.eric@gmail.com> wrote in message > > news:1134033868.487979.128590@g49g2000cwa.googlegroups.com... > > > Hi > > > > > > At a minimum we need to know how much bandwidth and latency you > > > accept/require for the communication between your FPGAs and how muchof> > > your FPGAs you intend to dedicate to inter-FPGAs communication. The > > > caracteristics of the FPGA themselves are also welcome. > > > > > > Waiting for your answer, > > > > > > Eric DELAGE, Senior ASIC/FPGA Architect > > > EMail: nospam DOT eric AT gmail DOT com > > > Homepage: http://eric-delage.no-ip.info > > > > > > > Many Thanks in advance! > > > > Fortunately I make sure my chief changes his mind toward the use of 2 > FPGA. > > Now we're searching for an adapter for BGA package. > > I have found this from Interconnect Systems: HiLoTM BGA SocketingSupports> > Xilinx� Virtex 4 BGA Packages > > > > Does anyone has already used it? Could proive feedback? > > > > Many and many thanks > > MArco > > > > > >
Reply by ●December 8, 20052005-12-08
Marco <marcotoschi@nospam.it> wrote:> "Antti Lukats" <antti@openchip.org> wrote in message > news:dn6b3a$h6c$01$1@news.t-online.com... > > "Marco" <marcotoschi@nospam.it> schrieb im Newsbeitrag > > news:dn643r$hbo$1@nnrp.ngi.it... > >> Hallo, > >> does anyone has connected 2 FPGA? > >> Which kind of connection have used? > >> > >> Many Thanks > >> Marco > > > > FPGAs are often connected to each other by different means. > > > > your question can have no reasonable answers as you are the only > > person > > who know WHY you want to connect the FPGA, and the answer to that > > question > > is needed in order to decide HOW. It all depends why and what you are > > going to achive. > > > > Antti > >> I must develop a system with lots of I/O, about 180-190. My chief don't > want use BGA (fg320), but pq208... > so I thought to connect 2 fpga pq208.> I think it'is bad... but there are other chances?> Otherwise does exist a BGA adapter for fg320 package to change it into a > pq320?Why not use a FPGA module like the Zefant Modules? (www.zefant.de)? -- Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
