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.
new 6 August 1999, revised 7 January 2000