[Asterisk-Dev] TE405P *hardware* question

[Rob Gagnon]

I might be an electronics newbie here, but why cant you just toss a 3.3v
regulator on the board? let it cut the 5v down where needed

----- Original Message ----- 
From: "Paul Cadach" <paul at odt.east.telecom.kz>
To: <asterisk-dev at lists.digium.com>
Sent: Tuesday, April 13, 2004 12:32 PM
Subject: Re: [Asterisk-Dev] TE405P *hardware* question


> Hi,
>
> As I checked out Xilinx's datasheets CPLD used for TE410P's PCI bridge is
Spartan II-E family which is maximum 3.3V
> capable, while regular Spartan-II family (which is, I think, used for
TE405P) is supports both 3.3 and 5V for I/O pins,
> but requires different termination for each voltage. I don't have TE405P,
but as I remember there was a sort of problems
> with some chipsets. May be TE410P have ones too but they are not
reproducible because "ugly" chipset (or motherboard
> vendors) isn't support 3.3V for this chipset.
>
>
> So, I think, the problem is different termination of I/O blocks at the
Xilinx for 3.3 and 5 V for Spartan-II family.
>
>
> WBR,
> Paul.
>
>
> ----- Original Message -----
> From: "Andrew Kohlsmith" <akohlsmith-asterisk at benshaw.com>
> To: <asterisk-dev at lists.digium.com>
> Sent: Tuesday, April 13, 2004 11:24 PM
> Subject: [Asterisk-Dev] TE405P *hardware* question
>
>
> > Is there a specific design issue with making the TE405P a universal
3.3V/5V
> > product?  I've done a cursory review of the Xilinx part and it seems
that it
> > should be just fine to plug in to a 3V or 5V PCI slot, if I take a
hacksaw
> > and create the appropriate key.
> >
> > I haven't yet traced out the VIO pins to make sure that the Spartan will
> > honour the PCI bus voltage.
> >
> > Yes I am almost willing to sacrifice a $1500 card at this point in time.
:-)
> >
> > Can anyone who is familliar with the hardware design of this product
explain
> > why there are separate 3V and 5V cards?  Hell even the X101P and TDM400P
are
> > dual-voltage capable, what is preventing it on the quad T1/E1 cards?
> >
> > Regards,
> > Andrew
> > _______________________________________________
> > Asterisk-Dev mailing list
> > Asterisk-Dev at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-dev
> > To UNSUBSCRIBE or update options visit:
> >    http://lists.digium.com/mailman/listinfo/asterisk-dev
> >
>
> _______________________________________________
> Asterisk-Dev mailing list
> Asterisk-Dev at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-dev
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-dev
>