RXPT prototype schematic page descriptions Page1: J1, J2 J0 and front panel connectors Includes ESD strips, Geographic address pin logic, and the Power fusing and LED. Also RS-485 drivers and receivers for front panel connections to Trigger Supervisors. * Note that front panel connectors will change in final version to * correspond with the TS_2 front panel. Page2: Clock switching / buffering, Front panel switches w/debouncing for reset and single step clock J5 J6 ( labelled J3 ) connector with buffers for 160 return lines from backplane. Page 3: VME interface featuring the Cypress SVIC chipset Page 4: RXPT control chip ( Xilinx 4008 with serial prom ) Handles board level registers and initialization. Page 5: RXPT Device 1 Set of 3 Xilinx FPGAs with associated parallel EPROM which can handle all 160 possible return lines of type Done -or- Error -or- Busy for a single detector partition. *Note board features 4 independent devices. The following pages are very similar to this one. Page 6: Device 2 as above Page 7: Device 3 as above Page 8: Device 4 as above Page 9: Displays. LEDs, etc. --Thurston Chandler 9/98 Yale CDF Group