Command State 99271-Present

The above diagrams represent the P/E, RNG, and PEN logic that were proposed (seven years late!) as the optimum. The equations for P/E, RNG, and PEN events are:

Event type

Coincidence equation

P, E

P1.P2.P4*.AH*

RNG

P1.P2.P4.AH*

PEN

P1.P2.P8.AH*

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

P/E

NONE

P1 through P3

P/E

P/E

NONE

P1 through P4, P5, P6, or P7

RNG

RNG

NONE

P1 through P8

RNG, PEN

RNG, PEN

NONE

This accepts and sorts the events with low guard triggers that are required to work around the P3 center/guard crosstalk problem, and rejects all events with high guard triggers, which are not necessary for the workaround. This command state implements the same handoff of PEN events to the RNG buffer that was intended in the original post-launch command state, but with the addition that events with guard triggers are now handled consistently.

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new 6 August 1999, revised 7 January 2000

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