Fault capture/fault injection system

In a digital electronic system, apparatus for detecting and isolating faulty operation comprising, in combination:

• (a) fault indication means associated with a predetermined grouping of logic circuits for producing a fault signal indicative of a fault or error condition in said grouping of logic circuits;
• (b) fault capture means coupled to a plurality of fault indication means for providing a group fault output signal indicative that at least one of said fault indication means has produced said fault signal, said fault capture means including:
• (i) first register means for capturing said fault signals,
• (ii) error latch means set upon a first fault signal being captured in said first register means for producing said group fault output signal,
• (iii) logic means responsive to said grouping fault output signal for inhibiting capture of fault signals subsequent to said first fault signal,
• (iv) second register means for storing mask data, said mask data being the cumulative fault signals propagated to said first register means,
• (v) means for selectively inhibiting inputs to said first register means conditional upon the state of said second register means, and
• (vi) third register means connected to receive the contents of said first register means,
• (c) programmable controller means including
• (i) interrupt means coupled to receive said group fault signal,
• (ii) capture control means for
• (a) transferring the contents of said first register to said third register, and
• (b) resetting said error latch means,
• (iii) memory means for logging cumulative fault events occurring in said logic circuits, and
• (iv) data communication means for transferring data from said third register to said memory means.