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SIS Documentation
SIS3820
VME Scaler
Page 38 of 79
7.18.7 LNE source
The three LNE source bits define what signal the LNE (load next event) signal is derived
from. In channel N source mode the LNE channel register defines what scaler channel the
LNE signal is derived from.
LNE Bit 2 LNE Bit 1 LNE Bit 0 LNE source
0
0
0
VME key address only (ignore front panel signals)
0
0
1
Front panel control signal
0
1
0
10 MHz internal pulser
0
1
1
Channel N (ChN)
1
0
0
Preset Scaler N (MCS only)
LNE sources can be prescaled with the LNE prescaler where needed. The LNE prescaler is
active if the prescale factor register is loaded with a non zero value.
Routed through LNE prescaler if
≠
0 LNE source
no
VME key address only (ignore front panel signals)
yes
Front panel control signal
yes
10 MHz internal pulser
yes
Channel N (ChN)
no
Preset Scaler N
Note 1:
The maximum input frequency for the channel N or front panel LNE is limited to 10
MHz
Note 2:
The external LNE and channel N rate is limited to 5 MHz