METHOD FOR FORMING PACKET CONTROL LIST FOR CONTROLLING DMA MACHINE IN PACKET DATA COMMUNICATION SYSTEM, AND FORMAT THEREFOR

摘要

PROBLEM TO BE SOLVED: To reduce the frequency of memory access by allocating a predetermined space in a memory and determining a next-program list address for structuring a program control list in relation with data packet transfer equipment. SOLUTION: A PCI interface ASIC 20 executes a basic function for data packet transmission control between equipment which operates in environment where a PCI bus 24 is supported and equipment which operates in high-speed input/output peripheral equipment environment. Further, the PCI interface ASIC 20 has the function of a cycle master and has lost cycle start message detecting capability. The PCI interface ASIC 20 supports an equal-time-interval barrier between the PCI interface ASIC 20 and a physical layer interface 18 and execute programmable channel address comparator logic for a received input data packet to allocate a DMA channel.