TMS570LS3137: Change OSCILLATOR FREQ from 16MHz To 25MHz .

Hi Ajith Kumar,

First of all, it is not recommended to operate TMS570LS3137 controller with 25MHz oscillator.

As you can see its timing requirements, it is 50ns(min) to 200ns(max). That means if we converted into frequencies,

Minimum oscillator frequency= 1/200ns = 5Mhz

Maximum oscillator frequency=1/50ns = 20Mhz

So that means we should not use the crystal with more than 20Mhz for to generate oscillator frequency.

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Thanks & regards,
Jagadish.

Hi Jagadish,

In Ethernet Bootloader link tidc817.zip. It does not consists of Halcogen .hcg file. I need to change the osc freq as 25MHz,Clk div as 10, Multiplier 128 as below image

In code compressor studio what are the changes i have to made to achive this.

Thanks and Regards,

A. Ajith Kumar

Hi Ajith Kumar,

AJITH KUMAR said:

I need to change the osc freq as 25MHz,Clk div as 10, Multiplier 128 as below image

You no need to configure the 25Mhz in the code because it will automatically generated by hardware right, so you just need to configure 10 and 128 for PLL1.

And you can do that by changing at below line

change the highlighted line as shown in right side of the image in system.c

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Thanks & regards,
Jagadish.

Hi Jagadish,

After changing the above setting for PLLCTL1 in system.c. The program does not work and the IC getting heated. Is there anyother to configure in system.h.

Thanks and Regards,

A.Ajith Kumar