What does Realtime Mean

1
What does Realtime Mean?

• In General
• Predictable Response Time
• Elevator Comparison
• Special Requirements
• e.g. lip synchronous 10 ms
• bi-directional communication 500ms

2
Comparison of DSP Architectures

• Basic Thesises
• Performance Estimation of DSPs is a multi
  dimensional decision!
• Performance Analysis is application dependent
• MIPS Meaningless Indicator of Processing Speed

3
Comparison Dimensions

• MACs per second
• Parallel Move Capability
• Number of Register
• Peripheral performance
• DMA Capability
• Accuracy (Floating Point needed / Rounding? /
  word length)
• Efficiency of command set
• Control overhead for subroutines and hardware
  loops
• Interrupt processing (Fast Interrupts)
• Instruction stalls
• Power consumption
• Price