SM320C6748-HIREL: Maximum allowable uPP receive clock frequency

Pawan Ghotikar

Part Number: SM320C6748-HIREL
Other Parts Discussed in Thread: TMS320C6748

Hi,
Which of the following is true?
1. Found in https://www.ti.com/lit/ds/symlink/sm320c6748-hirel.pdf?ts=1645654035840&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSM320C6748-HIREL pg203/265

2. Found in TMS320C6748 DSP Technical Reference Manual (Rev. A) pg1469/1752

Also, what happens if we drive uPP clock with 100MHz SDR?

Thanks,
Pawan

over 3 years ago

0 Pawan Ghotikar over 3 years ago

Expert 1140 points

Hi,
Does that also mean if I want to use uPP then maximum DSP clock frequency cannot exceed 300MHz? What if we set CPU frequency to 375MHz and DDR clock to 100MHz, which is used by uPP?
I am confused, please assist.

Thanks,
Pawan

0 Mukul Bhatnagar over 3 years ago in reply to Pawan Ghotikar

TI__Guru* 84455 points

Hi Pawan

I recommend looking at some older threads

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/693032/tms320c6748-need-confirmation-on-max-receive-clock-input-on-the-upp

Additionally there in XLS based clock tree/PLL configuration utility

Programming PLL Controllers on OMAP-L1x8/C674x/AM18xx

Bottomline , unfortunately the max IO clock speed supported is as mentioned in the datasheet 75MHz for SDR and 37.5 MHz for DDR

Running it higher frequency will violate datasheet timing and you may see failures.

Regards

Mukul

0 Pawan Ghotikar over 3 years ago in reply to Mukul Bhatnagar

Expert 1140 points

Mukul,
Really appreciate your response.

Thanks,
Pawan

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SM320C6748-HIREL: Maximum allowable uPP receive clock frequency