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    • 8. 发明授权
    • Test mode control logic system
    • 测试模式控制逻辑系统
    • US4236208A
    • 1980-11-25
    • US956384
    • 1978-10-31
    • David B. O'KeefeKenneth E. BruceRalph M. Lombardo, Jr.Bruce H. TarboxJohn W. Conway
    • David B. O'KeefeKenneth E. BruceRalph M. Lombardo, Jr.Bruce H. TarboxJohn W. Conway
    • G06F11/27G06F13/40G06F13/42G06F3/04G06F11/22
    • G06F13/4213G06F11/27G06F13/4027
    • A logic control system is disclosed for verifying the operability of memory and non-memory data and control paths in both local and remote intersystem link (ISL) units electrically interconnecting a local and remote communication bus in a data processing system. The data processing system may include two or more communication busses each pair of which are electrically interconnected by twin ISL units. The control logic architecture accommodates the receipt of a test mode command from a CPU on a local bus to initiate a test mode operation wherein the memory and non-memory data and control paths of both the local and the remote ISL units are excerised while on-line, and binary coded information received from the local bus is passed through the ISL units, onto the remote bus, and returned to a local bus memory resource for verification. No remote bus resources are used or affected, and the remote ISL unit shall ignore any communications received from any other data processing unit on the remote bus. The remote ISL unit is effectively non-existent to other data processing units on the remote bus.
    • 公开了用于验证在数据处理系统中电连接本地和远程通信总线的本地和远程系统间链路(ISL)单元中的存储器和非存储器数据和控制路径的可操作性的逻辑控制系统。 数据处理系统可以包括两个或更多个通过双ISL单元电连接的通信总线。 控制逻辑架构适应于从本地总线上的CPU接收测试模式命令以启动测试模式操作,其中本地和远程ISL单元的存储器和非存储器数据以及控制路径被切换, 线路和从本地总线接收的二进制编码信息通过ISL单元传递到远程总线上,并返回到本地总线存储器资源进行验证。 没有使用或影响远程总线资源,远程ISL单元将忽略从远程总线上任何其他数据处理单元接收到的任何通信。 远程ISL单元实际上不存在于远程总线上的其他数据处理单元。