SIS3600 (Input Register)

Input register: 32 TTL inputs. VME A24D32 2k at 0x010000. Jumper: J500 111, EN-A24, J_A11 1, J520 1, all other pin pairs are open. Rotary switches 00010 (left to right, VME connectors are right).

Power requirements: $<$ 17.5 W, $<$ 3.5 A at +5V.

Reading this input register returns a 32-bit word.

The SIS3600 is defined by:

  define/dev=input_register/module=sis3600/base=0x10000/chan=0 latch1

The following piece of code shows how the value of a particular bit can be the return value of a virtual counter:

   if( $method =~ /reset/i)
   {
     return 1;
   }

   if( $method =~ /read/i)
   { 
     #
     # 0 is the number of the first input channel (down-left)
     #
     my $bitno = 0; 
     return ((Spectra::rir( "latch1") >> $bitno) & 1);
   }