SIS Documentation
SIS3820
VME Scaler
Page 9 of 79
4 Functionality
The functionality of the SIS3820 is a combination of hardware (printed circuit board) design,
stuffing options and firmware. The module consists of two FPGAs that hold the frontend
logic and on FPGA that holds the VME interface, the SDRAM controller and the control logic
functions. Logic level adaptation is handled by classic DIL components and single inline
(SIL) resistor networks. The firmware is loaded from a serial PROM at power up. Both JTAG
and VME can be used for in field firmware upgrades/changes.
4.1 Block
Diagram
SDRAM
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
Driver/Receiver
16 x
Frontend
FPGA
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
Driver/Receiver
16 x
VME
and
Control
FPGA
4 x
Level Adaptation
Driver/Receiver
4 x
Level Adaptation
Driver/Receiver
Frontend
FPGA
P
2
(A,C)
V
M
E P1
a
nd P2