[SI-LIST] Re: Cable requirement for High Speed Video Bus
- From: Alan Barry <barry.alan@xxxxxxxxx>
- To: Michael Rose <mrose@xxxxxxxxxxxx>
- Date: Fri, 10 Jul 2009 15:41:55 +0100
I've used a 16 bit parallel LVDS link at 150MHz for video over 3m of
twist-n-flat ribbon cable, using standard 0.1" IDC connectors and fairly
sparse grounding. I think it's easier not to to use a serdes solution.
On Fri, Jul 10, 2009 at 2:57 PM, Michael Rose <mrose@xxxxxxxxxxxx> wrote:
> Joe,
>
> Probably not with a single lane. Most implementations will use 2, 3, or
> 4 lanes to reduce the cable bandwidth. Also, some serdes use a
> proprietary DC balance coding schemes use just 2 bits out of 20 so
> overhead is a little lower. Cable equalization is probably needed above
> 1Ghz if driving more than a foot of TP. A recent design, serializing a
> 50MHz 12-bit interface over 2 lanes had plenty of margin driving 10
> Meters of standard HDMI cable (with no equalization). As I remember,
> Nyquist was just below 400MHz.
>
> Mike
>
> -----Original Message-----
> From: Joseph.Schachner@xxxxxxxxxx [mailto:Joseph.Schachner@xxxxxxxxxx]
> Sent: Friday, July 10, 2009 9:38 AM
> To: Michael Rose
> Cc: Girish Thorat; si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: Cable requirement for High Speed Video Bus
>
> Re: "...high speed serdes..."
>
> So you are suggesting that the 8 bit parallel data should be serialized.
> With some overhead for staying in synch, that probably means that
> 150MB/s
> will be transfered at 1.5Gb/s = 667ps per bit. So transition times
> should
> be about 250ps or so, therefore I'd want the cable to be able to pass
> 2GHz
> over the necessary length without unacceptable loss at that frequency.
> I
> guess for a short length, twisted pair can do that.
>
> --- Joe S.
>
>
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