OMAP L-138 McBSP clock to a DECT slave

Kenny Cheung

Other Parts Discussed in Thread: OMAPL138

Hi,

I want to connect the McBSP master to a DECT slave. The DECT accepts clocks freq of 512khz, 768khz, 1.536Mhz and 2.048Mhz. The OMAP has a 24Mhz crystal which I cannot find a combination of divider settings to match with the DECT freq. Does anyone knows what the divider settings should be or I have to chang the OMAP crystal freqency to match?

Regards

Kenny Cheung

over 13 years ago

0 Sivaraj Kuppuraj over 13 years ago

TI__Mastermind 35645 points

Hi Kenny,

Thanks for your post.

Any Module's clock frequency shall be scaled by programming the PLL multiply and divide parameters. Also, some modules might have internal clock dividers too to scale down the frequency. Please find the OMAPL138 technical reference manual link below in which, kindly refer Chapter 7 - The Device Clocking which gives the complete details on the clocking structure of any particular device whose clock control registers can be configured. The combination of the PLL multiplier, POSTDIV, and PLLDIV blocks provides flexibility in the frequencies which the system clock domains shall support.

http://www.ti.com/lit/ug/spruh77a/spruh77a.pdf

Also, refer PLL control register sections for the combination of divider settings in the above technical reference manual.

Please refer the McBSP0 & MCBSP1 timing requirement in the datasheet link which is given below:

http://www.ti.com/lit/ds/symlink/omap-l138.pdf

Thanks & regards,

Sivaraj K

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OMAP L-138 McBSP clock to a DECT slave