In this paper, we propose and design Responsive Processor for parallel/distributed real-time processing, which can control various electronic control systems including robots, mechatronic systems, home automation, office automation, factory automation, etc. Responsive Processor integrates many functions into an ASIC chip, such as a RISC MPU core (SPARC), Responsive Links for real-time communication, many peripheral functions including SDRAM I/Fs, DMAC, PCI, USB, PWM generators, A/D converters, D/A converters, etc. In order to realize real-time communication needed for parallel/distributed control, a set of Responsive Link consists of a pair of two-way data links and event links. Prioritized routing which enables packets with higher priority to overtake other packets is implemented by hardware at each node. Many kinds of systems can flexibly be composed by connecting these chips using Responsive Links.