信息技术 可伸缩相干接口(SCI

[中文适用范围]： 该标准将包含两级接口，定义小于 10 m 的距离内的操作。 物理层将指定连接器和卡的电气、机械和热特性。 逻辑层将描述地址空间、数据传输协议、高速缓存一致性机制、同步原语、控制和状态寄存器以及初始化和错误恢复设施。 [外文原描述]： The scalable coherent interface (SCI) provides computer-bus-like services but, instead of a bus, uses a collection of fast point-to-point unidirectional links to provide the far higher throughput needed for high-performance multiprocessor systems. SCI supports distributed, shared memory with optional cache coherence for tightly coupled systems, and message-passing for loosely coupled systems. Initial SCI links are defined at 1 Gbyte/s (16-bit parallel) and 1 Gb/s (serial). For applications requiring modular packaging, an interchangeable module is specified along with connector and power. The packets and protocols that implement transactions are defined and their formal specification is provided in the form of computer programs. In addition to the usual read-and-write transactions, SCI supports efficient multiprocessor lock transactions. The distributed cache-coherence protocols are efficient and can recover from an arbitrary number of transmission failures. SCI protocols ensure forward progress despite multiprocessor conflicts (no deadlocks or starvation).