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videomixer: stick to 20x PLL configuration as 10x causes traditional spartan6 weirdness

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This commit is contained in:
Sebastien Bourdeauducq 2013-11-18 20:43:30 +01:00
parent a75be2e5dd
commit f62615054d
1 changed files with 10 additions and 0 deletions
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10
software/videomixer/pll.c
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@ -56,6 +56,15 @@ static void program_data(const unsigned short *data)
void pll_config_for_clock(int freq)
{
/*
* FIXME:
* 10x configuration causes random IDELAY lockups (at high frequencies it seems)
* 20x configuration seems to always work, even with overclocked VCO
* Reproducible both with DRP and initial reconfiguration.
* Until this spartan6 weirdness is sorted out, just stick to 20x.
*/
program_data(pll_config_20x);
#ifdef XILINX_SPARTAN6_WORKS_AMAZINGLY_WELL
if(freq < 2000)
printf("Frequency too low for PLLs\n");
else if(freq < 4500)
@ -64,6 +73,7 @@ void pll_config_for_clock(int freq)
program_data(pll_config_10x);
else
printf("Frequency too high for PLLs\n");
#endif
}
void pll_dump(void)