Computer system with adaptive memory arbitration scheme

摘要: A computer system includes an adaptive memory arbiter for prioritizing access requests, including a self-adjusting, programmable request-priority ranking system. The adapts during every arbitration cycle, reducing the priority of any request which wins arbitration. Thus, initially holding low may gradually advance in until that Such scheme prevents lower-priority devices from becoming “memory-starved.” Because some types requests (such as refresh and reads) inherently require faster than other writes), additionally integrates nonadjustable structure into guarantees service to most urgent requests. Also, introduces flexible method adjustable priority-weighting permits selected transact number consecutive accesses without those losing priority.