LB 500 programming for Pi-Beta trigger

This LB 500 replaces the old pibeta trigger and produces out of the ten super-clusters low and ten super-clusters high four signals. The first two represent the pi-beta back-to-back logic, where one supercluster has to fire in coincidence with the opposite superclusters. The pibeta signals are genrated both for Hi and Lo supercluster inputs. The second output is a simple or of all superclusters, also Hi and Lo.

The labels on the inputs and outputs are in the form HnPm, where n is the header number (1...4 from top to down) and m is the pin number (1..16, as labeled on the unit).

Here is the toplevel schematic:

It contains the back-to-back logic:

a three-arm trigger:

and shapers:

The additional buffers at the output of the shapers are for signal delay.

S. Ritt, August 2nd, 1999