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在大多数在线诊断电路中,每当微处理机系统检测到一个故障时,总是启动所包含的系统校正程序,而不管故障是由芯片内的故障引起的还是由芯片外(比方说在连接探针与芯片的接头上)的故障引起的。上述后一种故障只是在某个信息从一个芯片传输到另一个芯片(例如从某个微处理机芯片传输到另一个存储器芯片)时使系统产生错误。本文介绍两种系统校正新技术,当错误出现在任何系统的数据传输通路上时应用这些技术可就地实现校正。本系统确保以独特的复算(single retry)方式消除任何单个固定型故障,单个“与”型桥接故障或单个“或”型桥接故障。这些技术使在线系统诊断获得更加有效的二级诊断方法。即,采用复杂而完善的程序实现芯片内故障的系统校正,且以独特的复算方式就地实现对数据传输故障(例如数据总线和地址总线)的校正。
In most on-line diagnostic circuits, whenever a fault is detected by the microprocessor system, the included system calibration routine is always started regardless of whether the fault was caused by a chip fault or by a chip Probe and chip connector) caused by the failure. The latter fault just causes a system error when some information is transferred from one chip to another (for example, from one microprocessor chip to another memory chip). This article describes two new system calibration techniques that apply these techniques in place to correct for errors that occur on any system’s data transmission path. The system ensures unique single retry eliminates any single fixed fault, single “and” bridge fault or single “or” bridge fault. These techniques make online system diagnostics more effective in secondary diagnostic methods. That is, the system correction of the intra-chip failure is implemented using a complicated and complete program, and the data transmission failure such as the data bus and the address bus is corrected in place in a unique way.