Re: [linux-dvb] [PATCH] TT S2-3200: Support for high symbol rates.

Re: [linux-dvb] [PATCH] TT S2-3200: Support for high symbol rates.

[Igor M. Liplianin]

> Igor M. Liplianin wrote:
> > TT S2-3200: Support for high symbol rates.
> >
> > From: Igor M. Liplianin <liplianin@me.by>
> >
> > TT S2-3200: Support for high symbol rates.
> > Successfully tested for 44948 kSym/s
> >
> > Signed-off-by: Igor M. Liplianin <liplianin@me.by>
> >
> >
> > ------------------------------------------------------------------------
> >
> > # HG changeset patch
> > # User Igor M. Liplianin <liplianin@me.by>
> > # Date 1226180014 -7200
> > # Node ID 1c4d63e589e0420d95d96bf81d3bfbb2cd39a9cf
> > # Parent  54b128d638438037c7cb4417045c0d773c21d9e7
> > TT S2-3200: Support for high symbol rates.
> >
> > From: Igor M. Liplianin <liplianin@me.by>
> >
> > TT S2-3200: Support for high symbol rates.
> > Successfully tested for 44948 kSym/s
> >
> > Signed-off-by: Igor M. Liplianin <liplianin@me.by>
> >
> > diff -r 54b128d63843 -r 1c4d63e589e0
> > linux/drivers/media/dvb/ttpci/budget-ci.c ---
> > a/linux/drivers/media/dvb/ttpci/budget-ci.c	Sun Nov 09 16:35:13 2008
> > +0200 +++ b/linux/drivers/media/dvb/ttpci/budget-ci.c	Sat Nov 08 23:33:34
> > 2008 +0200 @@ -1321,7 +1321,7 @@
> >  	.inversion		= IQ_SWAP_ON, /* 1 */
> >
> >  	.lo_clk			= 76500000,
> > -	.hi_clk			= 99000000,
> > +	.hi_clk			= 135000000,
> >
> >  	.esno_ave		= STB0899_DVBS2_ESNO_AVE,
> >  	.esno_quant		= STB0899_DVBS2_ESNO_QUANT,
>
> The STB0899 is never rated to run at 135MHz clock. Some older die cuts
> would even cause clock race arounds at even 108MHz. The recommended
> maximum clock is 99 MHz at maximum.
>
> Is your STB0899 demodulator still functional, what inscriptions are
> there on the demodulator ? I mean continuously running with this Clock
> for a day or two at least .. ?
>
> Regards,
> Manu

Only couple hours per day. Вut every day
And still functional :)

-- 
Igor M. Liplianin
Microsoft Windows Free Zone - Linux used for all Computing Tasks

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Re: [linux-dvb] [PATCH] TT S2-3200: Support for high symbol rates.

[Christian Tramnitz]

Manu Abraham wrote:
> The STB0899 is never rated to run at 135MHz clock. Some older die cuts
> would even cause clock race arounds at even 108MHz. The recommended
> maximum clock is 99 MHz at maximum.

Hi Manu,

do you have more detailed information about this, i.e. how to find out 
the hw revision that would be affected?

Igor, are there any dependencies in your repository on the higher clock 
rate or can we just lower it so 99 again to be on the safe side?

Best regards,
    Christian


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