Institute of Electrical & Electronic Engineers
Most power reduction mechanisms for NoC channel buffers rely on on-demand wakeup to transition from a low-power state to the active state. Two drawbacks of on-demand wakeup limit its effectiveness: performance impact caused by wakeup delays and energy and area cost of sleep circuitry itself. What makes the problem harder to solve is that solutions to either problem tend to exacerbate the other. For example, faster wakeup from a power-gated state requires greater charge/discharge current for the sleep transistors while using nimbler sleep transistors implies long wakeup delays. As a result, powerdowns have to be conservatively prescribed, missing many power-saving opportunities.