How come in the pdf of the vq100 diagram, it shows something with 64 pins. This is odd because the spartan 3e sure doesn't come in a vq64, it comes in a vq100. Maybe they mean the vq100 has 64 pins but that doesn't make sense because the pinout spreadsheet has 100 entries. And how would you divide 100 by 4 to fill up 4 sides of a square chip? You cant do that with 100 unless its a 5 sided chip. Thanks.
spartan 3e VQ100 serious question
Started by ●December 12, 2007
Reply by ●December 12, 20072007-12-12
On Dec 12, 4:45 pm, Josh.OuterSp...@gmail.com wrote:> How come in the pdf of the vq100 diagram, it shows something with 64 > pins. This is odd because the spartan 3e sure doesn't come in a vq64, > it comes in a vq100. Maybe they mean the vq100 has 64 pins but that > doesn't make sense because the pinout spreadsheet has 100 entries. > And how would you divide 100 by 4 to fill up 4 sides of a square > chip? You cant do that with 100 unless its a 5 sided chip. > > Thanks.This is the link the datasheet sends you to. http://www.xilinx.com/bvdocs/packages/vq100.pdf
Reply by ●December 12, 20072007-12-12
In comp.arch.fpga, Josh.OuterSpace@gmail.com <Josh.OuterSpace@gmail.com> wrote:> On Dec 12, 4:45 pm, Josh.OuterSp...@gmail.com wrote: >> How come in the pdf of the vq100 diagram, it shows something with 64 >> pins. This is odd because the spartan 3e sure doesn't come in a vq64, >> it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >> doesn't make sense because the pinout spreadsheet has 100 entries. >> And how would you divide 100 by 4 to fill up 4 sides of a square >> chip? You cant do that with 100 unless its a 5 sided chip. >> >> Thanks. > > This is the link the datasheet sends you to. > http://www.xilinx.com/bvdocs/packages/vq100.pdfThis is the mechanical drawing for the xilinx VQ44, VQ64 and VQ100 packages, not limited to spartan 3e. The pins drawn are just an indication and there happen to be 64 of them on the drawing, but that could have been 4 or 16 or 44... Just use the sizes from the table for the VQ100 package. There are 25 pins on each side, symetrical around the center of the package, 0.5mm pin pitch. But with any luck there will be a suitable shape in your pcb package library. -- Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)
Reply by ●December 12, 20072007-12-12
On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSpace@gmail.com wrote:>How come in the pdf of the vq100 diagram, it shows something with 64 >pins. This is odd because the spartan 3e sure doesn't come in a vq64, >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >doesn't make sense because the pinout spreadsheet has 100 entries. >And how would you divide 100 by 4 to fill up 4 sides of a square >chip? You cant do that with 100 unless its a 5 sided chip. > >Thanks.I couldn't swear to it, but I think that 100 divided by 4 is close to 25. John
Reply by ●December 13, 20072007-12-13
On Dec 12, 10:47 pm, John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com > wrote: > > >How come in the pdf of the vq100 diagram, it shows something with 64 > >pins. This is odd because the spartan 3e sure doesn't come in a vq64, > >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that > >doesn't make sense because the pinout spreadsheet has 100 entries. > >And how would you divide 100 by 4 to fill up 4 sides of a square > >chip? You cant do that with 100 unless its a 5 sided chip. > > >Thanks. > > I couldn't swear to it, but I think that 100 divided by 4 is close to > 25. > > JohnIt makes more sense to me to have 5 sides than an odd number of pins one side
Reply by ●December 13, 20072007-12-13
Josh.OuterSpace@gmail.com wrote:>On Dec 12, 10:47 pm, John Larkin ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: >> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com >> wrote: >> >> >How come in the pdf of the vq100 diagram, it shows something with 64 >> >pins. This is odd because the spartan 3e sure doesn't come in a vq64, >> >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >> >doesn't make sense because the pinout spreadsheet has 100 entries. >> >And how would you divide 100 by 4 to fill up 4 sides of a square >> >chip? You cant do that with 100 unless its a 5 sided chip. >> >> >Thanks. >> >> I couldn't swear to it, but I think that 100 divided by 4 is close to >> 25. >> >> John > >It makes more sense to me to have 5 sides than an odd number of pins >one sideHmm, why not make chip packages round? Would make soldering a bit more easy since the pin spacing would be maximal at the end of the leads. -- Reply to nico@nctdevpuntnl (punt=.) Bedrijven en winkels vindt U op www.adresboekje.nl
Reply by ●December 13, 20072007-12-13
Nico Coesel wrote:> Josh.OuterSpace@gmail.com wrote: > > >On Dec 12, 10:47 pm, John Larkin > ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: > >> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com > >> wrote: > >> > >> >How come in the pdf of the vq100 diagram, it shows something with 64 > >> >pins. This is odd because the spartan 3e sure doesn't come in a vq64, > >> >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that > >> >doesn't make sense because the pinout spreadsheet has 100 entries. > >> >And how would you divide 100 by 4 to fill up 4 sides of a square > >> >chip? You cant do that with 100 unless its a 5 sided chip. > >> > >> >Thanks. > >> > >> I couldn't swear to it, but I think that 100 divided by 4 is close to > >> 25. > >> > >> John > > > >It makes more sense to me to have 5 sides than an odd number of pins > >one side > > Hmm, why not make chip packages round? Would make soldering a bit more > easy since the pin spacing would be maximal at the end of the leads. > > -- > Reply to nico@nctdevpuntnl (punt=.) > Bedrijven en winkels vindt U op www.adresboekje.nlWhy do we have to be locked into the concept of a flat chip that has to rest on a flat board? I want spherical chips that snap together like playing legos.
Reply by ●December 13, 20072007-12-13
On Wed, 12 Dec 2007 22:36:39 -0800 (PST), Josh.OuterSpace@gmail.com wrote:>On Dec 12, 10:47 pm, John Larkin ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: >> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com >> wrote: >> >> >How come in the pdf of the vq100 diagram, it shows something with 64 >> >pins. This is odd because the spartan 3e sure doesn't come in a vq64, >> >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >> >doesn't make sense because the pinout spreadsheet has 100 entries. >> >And how would you divide 100 by 4 to fill up 4 sides of a square >> >chip? You cant do that with 100 unless its a 5 sided chip. >> >> >Thanks. >> >> I couldn't swear to it, but I think that 100 divided by 4 is close to >> 25. >> >> John > >It makes more sense to me to have 5 sides than an odd number of pins >one sideTell that to a 7400. - Brian
Reply by ●December 14, 20072007-12-14
On Thu, 13 Dec 2007 12:29:30 +0000, Brian Drummond <brian_drummond@btconnect.com> wrote:>On Wed, 12 Dec 2007 22:36:39 -0800 (PST), Josh.OuterSpace@gmail.com >wrote: > >>On Dec 12, 10:47 pm, John Larkin >><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: >>> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com >>> wrote: >>> >>> >How come in the pdf of the vq100 diagram, it shows something with 64 >>> >pins. This is odd because the spartan 3e sure doesn't come in a vq64, >>> >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >>> >doesn't make sense because the pinout spreadsheet has 100 entries. >>> >And how would you divide 100 by 4 to fill up 4 sides of a square >>> >chip? You cant do that with 100 unless its a 5 sided chip. >>> >>> >Thanks. >>> >>> I couldn't swear to it, but I think that 100 divided by 4 is close to >>> 25. >>> >>> John >> >>It makes more sense to me to have 5 sides than an odd number of pins >>one side > >Tell that to a 7400. > >- BrianThree horroble mistakes were made, that we suffer from to this day: dip packages are physically symmetric; pins are numbered circularly; Vcc and ground are in the corners. John
Reply by ●December 14, 20072007-12-14
On Wed, 12 Dec 2007 22:36:39 -0800 (PST), Josh.OuterSpace@gmail.com wrote:>On Dec 12, 10:47 pm, John Larkin ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: >> On Wed, 12 Dec 2007 13:45:47 -0800 (PST), Josh.OuterSp...@gmail.com >> wrote: >> >> >How come in the pdf of the vq100 diagram, it shows something with 64 >> >pins. This is odd because the spartan 3e sure doesn't come in a vq64, >> >it comes in a vq100. Maybe they mean the vq100 has 64 pins but that >> >doesn't make sense because the pinout spreadsheet has 100 entries. >> >And how would you divide 100 by 4 to fill up 4 sides of a square >> >chip? You cant do that with 100 unless its a 5 sided chip. >> >> >Thanks. >> >> I couldn't swear to it, but I think that 100 divided by 4 is close to >> 25. >> >> John > >It makes more sense to me to have 5 sides than an odd number of pins >one sideWell, you are from outer space. John
