Industrial Technology Research Institute

Yen-Tun Peng

Chi-Lung Wang

I-Yen Chen

Yung-Cheng Ma

Disclosed is directed to a speed-level calculator and calculating method for dynamic voltage scaling. The speed-level calculator comprises a deadline counter, a shifter, and a fixed-point multiplier. The deadline counter calculates the residual time D from current time to each task deadline for completing an episode. The shifter generates a D' value by shifting the D value to the right for e-m bits, and takes the decimal fraction part of the D&#x2032; value for m bits. The speed-level calculator further comprises a saturation control circuit to detect if an overflow occurs on the D&#x2032; value. According to a pre-calculated parameter &#x3b1;corresponding to each task T, the fixed-point multiplier performs the multiplication of D&#x2032; and &#x3b1;. After completing saturation and rounding on the multiplication result, a corresponding clock period is generated by taking the integer part. This clock period is used as speed-level to switch the processor voltage and frequency.

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Yen-Tun Peng