Nominal Command State

The above diagrams represent the P/E, RNG, and PEN logic as designed. The equations for P/E, RNG, and PEN events are:

Event type	Coincidence equation
P, E	P1.P2.P4.AL
RNG	P1.P2.P4.P8.AL
PEN	P1.P2.P8

The buffers into which "orderly" events can fall are as follows:

Range	No guards triggered	Low, not high guard triggered	High guard triggered
P1	NONE	NONE	NONE
P1 through P2	P/E	NONE	NONE
P1 through P3	P/E	NONE	NONE
P1 through P4, P5, P6, or P7	RNG	NONE	NONE
P1 through P8	PEN	PEN	PEN

As in all subsequent discussions, I discuss the P and E event buffers and the PLO, PHI, ELO, and EHI rate scalers together, letting P1A and P3 sort among the two buffers and four rates. Note that there are no ambiguities in the above table of buffers, so any events that come out in a given buffer are counted in the corresponding rate scaler, and there are no events that can be counted by a rate scaler but that don't "qualify" for output in the corresponding buffer, so that the subset of PHA events that come out in a buffer is a representative sample of everything that caused the rate scaler to increment.

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new 6 August 1999