SPRABF9 March   2019 TMS320C6742 , TMS320C6742 , TMS320C6746 , TMS320C6746 , TMS320C6748 , TMS320C6748

 

  1.   1
  2.   Trademarks
  3. 1Introduction
  4. 2Model Activity
    1. 2.1 Activity-Based Models
    2. 2.2 Baseline Power
    3. 2.3 Activity Power
    4. 2.4 Modules
  5. 3Using the Power Estimation Spreadsheet
    1. 3.1 Choosing Appropriate Values
      1. 3.1.1 Utilization
      2. 3.1.2 % Writes
      3. 3.1.3 % Switching
  6. 4Using the Results
    1. 4.1 Adjusting I/O Power Result
  7. 5Thermal Considerations
  8. 6Example
  9. 7Limitations
  10. 8References

6 Example

The following examples demonstrate how to choose appropriate values for a particular application. These values may be imported into the spreadsheet by clicking the appropriate macro button.

The Static/Deepsleep macro button reports the static power for the device, when the CLKIN is cut off and voltage is applied to the various core and I/O rails. This is also the deep-sleep power consumption.

The Standby macro button reports the power consumed with the 24 Mhz CLKIN. PLL0 is powered down/disabled and the system is operating in bypass mode with the CLKIN as the system clock. The DSP is in the Megamodule sleep mode and all peripherals are disabled.

The Typical-300 Mhz macro button can be used to quickly visualize the use case scenario as described in the C6748 tech brief. The details of the peripherals and their operating conditions used in this scenario are:

  • Core Voltage: 1.2 V
  • Dual I/O Voltage: 1.8 V
  • Junction temperature: 25°C
  • CLKIN: 24 Mhz
  • Device Frequency: 300 Mhz
  • DSP: Enabled, 70% Utilization
  • mDDR: Enabled and running at 133 Mhz, 50% Utilization, 50% Writes, 50% Switch
  • EDMA3CC: Enabled
  • EDMA3TC0: Enabled
  • EDMA3TC1: Enabled
  • McASP0: Enabled and running at 24 Mhz, 100% Utilization, 50% Switch, 1 serializer
  • SPI0: Enabled and running at 27 Mhz, 50% Utilization, 50% Switch
  • GPIO: Enabled and running at 18.75 Mhz, 50% Utilization, 1 GPIO used

All other modules are not used and disabled.

The Typical-456 Mhz macro button is the same as the Typical-300 Mhz macro button, except that core voltage is at 1.3 volts, and the device is running at 456 Mhz.

The RTC Power Only macro button reports the power consumed with 1.2 V applied only to RTC CVDD. Core and I/O rails are powered off.