C66 Power consumption

The numbers quoted are more realistic for a typical loaded system.  The default spreadsheet is a fully loaded Media Gateway solution.

It's not realistic to peg everything at 100% utilization to start with, and you've set the CPU utilization of SP (Signal Processing) + CC (Control Code) to > 100%.  In reality a typical loading for a system is ~27% of the time SP (this is utilizing 8 functional units per cycle) if it's doing SP but only averaging 4-5 functional units per cycle this needs to be weighted in the SP %.   This is the biggest offender.  40% SP + 20% CC would be an extremely loaded system.

You should go back and look at what you realistically need on the IP utilization as well.  Pegging everything at a 100% is not realistic.

Best Regards,
Chad

Type typical utilization of the IP blocks range more from system to system, and depend more on the amount of data traffic than anything else.  That said, we seldom see DDR2 > 60-75%, you may have one or two high speed IO's in the 100% range but not may (the low speed IO's like SPI, UART, I2C can be set to 100% as they don't contribute much to the overall power consumption.)  As mentioned before the MGW application which is the scenario that's the spreadsheet is pre-populated with when you download it, is a typical highly loaded system.

There's a separate power consumption spreadsheet for TMS320C6672 available on it's product page (click the device number to get to the product page.) 

Best Regards,

Chad

This would be an atypical highly loaded system.  And you should profile your system instead of tossing these types of loading numbers on it.

The power quoted is the total consumed power by the rails.  Heat generated of course is going to be relative to that.  Thermal solutions will need to be done to make sure you can meet your targeted device temp for the environment and thermal solution.

Best Regards,

Chad

Thanks. I will like to know if you have the relative heat generated from the total consumed power (eg. in percentage).

For example, heat consumed = 7.5W, heat dissipated = 3.75W.

This is going to be factor of heat sink, air flow, ambient temp, ...  You would need to do thermal modeling of your system to determine this.  We provide the thermal resistivity of the device so you can perform thermal modeling based on your system.  You will need to use a heat sink on C6678 at a minimum and should perform thermal analysis.  There's a Thermal Design Guide in the App Note section of the Product Page --> TMS320C6678 and the thermal resistance is provided in the Data Manual.

As for typical % utilization for MSMC and Navigator, it's going to depend on your system of course but 20% MSMC and 40% Navigator would probably be typical for a fairly loaded system.

Best Regards,

Chad