SIS Documentation
SIS3820
VME Scaler
Page 37 of 79
7.18.5 SDRAM mode (Bit 12) and SDRAM add mode (Bit 13)
The SDRAM mode bit defines whether the the SIS3820 is operated in SDRAM or FIFO
emulation mode
In SDRAM add mode the SIS3820 operates in SDRAM mode always (independent of the
SDRAM mode bit setting). An SDRAM add bit setting of one in combination with MCS
mode of operation results in HISCAL (hsitogramming scaler) operation.
SDRAM add mode bit
SDRAM mode bit
Mode
0 0
FIFO
emulation
0 1
SDRAM
1 0
SDRAM
1 1
SDRAM
7.18.6 Arm/enable source
The two arm/enable source bits define what signal the enable is derived from. In channel N
source mode the LNE channel register defines what scaler channel the enable signal is derived
from.
Arm/Enable Bit 1 Arm/Enable Bit 0 Arm/Enable source
0
0
LNE Front panel control signal
0
1
Channel N (ChN)
1 0
reserved
1 1
reserved
Notes:
1.)
be aware, that the front panel control signal is active with input modes 1, 2, 3, 5 and 6
only
2.)
ChN stands for the selected LNE channel