Complete Internal System Test for an Open-System Environment
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
This article describes a compete internal system test for an open- system environment utilizing a bus wrap command from the bus control unit (BCU). The wrap function is the means of taking input data and rerouting it to output data through selected input/output processors (IOPs), input/output adapters (IOAs) or device functional controllers (DFCs). (Image Omitted) Fig. 1 is a block diagram of an open-system concept. In order to test the I/O bus in an open system, a common means is needed to have data returned so that the bus activity and function can be checked. With an IOP wrap function any number (architecture limits to 32) of IOPs can be tested by just wrapping all IOPs in the bus. This would require no devices attached to test the bus.