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C5515 CGCR3 reads 0x080E after 0x0806 is written

Danimal
Expert 1135 points


Using CCSv4 and the C5515 ezDSP board/USB stick I run the .gel script that sets the PLL to use 120 MHz.

The GEL script configures th CGCR2 register for 0x0806 per the C551 user's guide.

When I read the CGCR3 register, it reads ox080E. If I try to manually change the value to 0x0806, I always get 0x080E.

I've reset the board, cycled power and get the same results.

Why is this?

  • 0
    TI__Prodigy 310 points

     

    This is a normal behavior.

    Bit field 3 of CGCR3 (register 1C22h) is the “Lock Status Monitor”.  It is set after 64 PLL clock cycles have passed since the last PLL power-up or reset. This confirms that the PLL is now locked.

    Regards, Nel