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SIS Documentation
SIS3820
VME Scaler
Page 45 of 79
7.26 Channel 1/17 Bits 33-48 register (0x210)
#define SIS3820_COUNTER_48BIT_EXTENSION
0x210
/* read only D32 */
This register holds the upper 16 bits of channels 1 and 17 (from firmware version 01 04
onwards). It is used in scaler mode (and typically it will make sense in non clearing mode
mainly)
Bit read
Function
31
Bit 48 of scaler channel 17
... ...
16
Bit 33 of scaler channel 17
15
Bit 48 of scaler channel 1
...
0
Bit 33 of scaler channel 1
7.27 Veto external count inhibit register (0x214)
#define SIS3820_VETO_EXTERNAL_COUNT_INHIBIT
0x214
/* r/w D32 */
This register can be used to veto the external inhibit (input modes 1, 2, 3, 4 and 6) for
individual scaler channels. By default the veto function is switched off for all channels.
Bit Function
31
Veto external count inhibit channel 32
0: do not veto (power up default), 1: veto external inhibit
...
0
Veto external count inhibit channel 1
0: do not veto (power up default), 1: veto external inhibit
Application example: measure up to 4 (input mode 4) gate open/closed ratios with internal
(channel 1) or external (other channels) reference clocks. By writing 0xFEFEFEFE to the
register and using input mode 4 you can use channel 1, 9, 17 and 25 gated with control input
1, 2, 3 and 4 respective as reference clocks (as shown in the screen dump below with all
channels counting with the 25 MHz internal test pulser and all control inputs set).