Abstract: With the exponential increase in chip density and complexity has caused an increasingly serious problem of power consumption, low-power technology draw attention of designers. In the view of commonly used SOC bus do not support power management, a power management bus, providing information aware, is proposed. The salve interface of power management bus can turn clocks off and even switch the supply rail or ground off when not required, which can dramatically reduce dynamic power and static power respectively. To reduce the overhead introduced by power management bus, we design a lightweight protocol with brief and flexible operation. What's the remarkable difference with traditional bus is its parallelism. Experimental results show the functional completeness and robustness of the compatibility.