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RE: [Discuss-gnuradio] Default FPGA I/O standard
From: |
Bahn William L Civ USAFA/DFCS |
Subject: |
RE: [Discuss-gnuradio] Default FPGA I/O standard |
Date: |
Tue, 2 Oct 2007 16:15:08 -0600 |
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf
> Of Brian Padalino
> Sent: Monday, October 01, 2007 5:53 PM
> To: Matt Ettus
> Cc: address@hidden
> Subject: Re: [Discuss-gnuradio] Default FPGA I/O standard
>
> On 10/1/07, Matt Ettus <address@hidden> wrote:
> > I think 3.3V LVTTL and LVCMOS are really the same.
> >
> > Matt
>
> According to this:
>
> http://www.interfacebus.com/voltage_LV_threshold.html
>
> They are, indeed, basically the same.
>
> Brian
They're the same only different.
For most purposes, the differences don't matter too much. The biggest
difference is in the output drive capability. LVTTL outputs are required to be
able to source/sink 2mA while remaining compliant while LVCMOS outputs are only
required to source/sink 100uA.
For those interested in the "official" word, refer to the actual JEDEC standard:
http://www.jedec.org/download/search/jesd8c.pdf