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SIS Documentation
SIS3820
VME Scaler
Page 12 of 79
5.2.3 Standard Counter
In the minimum counter application you enable the logic, have the module count for a period
of time and read out the scaler values after disabling the logic.
The sis3820_counter program runs 2 counting cycles of 5 s each. During the second cycle the
internal 50 MHz reference pulse generator is routed to channel 1. Sample output with a 11
MHz signal connected to scaler channel 17 is shown below.
mki@mki:~/sis1100/sis3820> ./sis3820_counter
SIS3820 scaler counting
gotwords 32
scaler data
ch01 00000000 ch02 00000000 ch03 00000000 ch04 00000000
ch05 00000000 ch06 00000000 ch07 00000000 ch08 00000000
ch09 00000000 ch10 00000000 ch11 00000000 ch12 00000000
ch13 00000000 ch14 00000000 ch15 00000000 ch16 00000000
ch17 03477ce7 ch18 00000000 ch19 00000000 ch20 00000000
ch21 00000000 ch22 00000000 ch23 00000000 ch24 00000000
ch25 00000000 ch26 00000000 ch27 00000000 ch28 00000000
ch29 00000000 ch30 00000000 ch31 00000000 ch32 00000000
now with reference pulser on ch1 enabled
SIS3820 scaler counting
gotwords 32
scaler data
ch01 0eedfb33 ch02 00000000 ch03 00000000 ch04 00000000
ch05 00000000 ch06 00000000 ch07 00000000 ch08 00000000
ch09 00000000 ch10 00000000 ch11 00000000 ch12 00000000
ch13 00000000 ch14 00000000 ch15 00000000 ch16 00000000
ch17 0348d70d ch18 00000000 ch19 00000000 ch20 00000000
ch21 00000000 ch22 00000000 ch23 00000000 ch24 00000000
ch25 00000000 ch26 00000000 ch27 00000000 ch28 00000000
ch29 00000000 ch30 00000000 ch31 00000000 ch32 00000000
Note:
The 50 MHz reference pulse generator will give you an idea on the sleep/scheduling
accuracy of your LINUX system.