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SIS Documentation
SIS3820
VME Scaler
Page 14 of 79
5.2.5 Preset Scaler
The sis3820_preset example illustrates preset scaling. Counter group 1 is activated for preset
scaling with channel 4 selected as preset channel (channel 1 with the TESTMKI compiler flag
set). A value of 0x1000000 is written to the preset value register of counter group 1 and the
logic enabled afterwards. The status of the preset enable and hit register is polled until
channel group 1 has reached its preset value..
mki@mki:~/sis1100/sis3820> ./sis3820_preset
gotwords 32
scaler data
ch01 00000000 ch02 00000000 ch03 00000000 ch04 01000002
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 00000000 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
mki@mki:~/sis1100/sis3820>
Note 1:
It will take in the order of 100 ns after the preset condition was detected before the
counter will stop counting. This implies, that the actual stored counter value will be greater
than the preset value for frequencies in excess of some 10 MHz. Above output was generated
with a symmetric 15 MHz source e.g.
Note 2:
The current version of
the sis3820_preset
features readout in 1s intervals in
parallel to ongoing acquisition.