Scalable tree structured high speed input/output subsystem architecture

摘要: A point to connection architecture for a computer I/O subsystem, resulting in scalable tree structure. Master Concentrator (MIOC) is connected the host bus and handles conversion between oriented structure of subsystem. Ports away from are downstream ports conform simple byte wide message protocol. Various IOCs devices can be attached one on MIOC. The MIOC directs transmissions appropriate channel based geographical addressing scheme. IOC connections act as further points branching. Ultimately IOD or reached, having an upstream port internal logic particular peripheral device. registers present IODs allow determination topology present. Messages commands transferred subsystem defined packets. read, write exchange used, with read response being utilized split transaction operations. Certain status control also Interrupts handled by interrupt levels correspond memory addresses programmable controller, thus allowing selection interrupts generated no need separate wiring.