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Read-Only Array Data Checking Disclosure Number: IPCOM000064641D
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19

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Palmer, HR [+details]


This technique presents a means of validating the contents of a read- only array during the initial diagnostic phase of a programmed device's operation. A typical application would be a micro-programmed processor, whose control program is retained in read-only storage (ROS) with a large number of bits per control word. The power-on diagnostic procedure would first verify the contents of the ROS, prior to the execution of the control program. The figure indicates the control store of a micro-programmed processor and its associated support hardware. During normal processor execution the sequencer provides an address to the control store and a read operation is executed.