******************************************* Clock: - GPS clock outputs 10 MHz sine wave, 1 VRMS (2.8 VPP) centered on 0, terminates in 50 ohm - Goes into Booster, multiplies by 5 into 50 MhZ TTL square wave, terminated in 50 ohms (ACM CLK input) - GPS clock outpus 1 PPS, TTL, terminated in 50 ohms (ACM 1 PPS input) Booster ECL STOP - ECL Stop pulse for TDC. Made with (ACM STOP, goes into TTL STOP on booster) AND (50 MHz sine). So, you need to delay the ACM STOP pulse with cable such that it picks out one peak ont he sine wave at the comparator input. Booster ECL START ******************************************* To have ACM send laser fire commands out of ZAP without TR encoder/index pulses: - Have CLK and 1 PPS plugged in naf n 4 13 Enable 50 MHz clock naf n 11 13 Use internal clock instead of TR encoder naf n 6 13 Enable the laser drive ******************************************* To have the ACM send out gate requests ******************************************* Other ACM commands: naf n 0 0 Read lower 16 bits of FRC naf n 1 0 Read upper 16 bits of FRC When the ACM sends out a stop pulse, te FRC is latched, and this is how you read out the latched value. ******************************************* Now that there are 2 gate widths, the 'read gate width' output data is both gate widths. The lowest sig 4 bits are the LUN gate width, and the next 4 bits are the FID gate width.