8 channel Multi functional VME Delay Gate Generator / Logic Module

The MDGG-8 is a single wide 6U VME multi functional FPGA based delay logic and timing module which provides often needed functions as gate, delay & pulse generator, logic fan in - fan out, coincidence register and scaler / pre-scaler. The module has 8 inputs and 8 outputs with NIM levels, which are free configurable in regards to their used functionality.

The MDGG-8 is based on a XC3S400 FPGA with 36kB of block RAM. Two FPGA configuration files can be stored in the on-board flash memory  from which the FPGA can boot at power-on (selection by a jumper). The flash memory can be reprogrammed via VME for firmware upgrades.

Hardware features

• A24/D32 VME slave module
• 8+1 NIM inputs (Lemo connectors)
• 8 NIM outputs (Lemo connectors), can be programmed to be inverted / non-inverted
• 8+4 diagnostic LEDs
• Interrupt capable

Built-in functions

• 8 programmable delay / gate / pulse generators, start/stop latches or pre-scalers (8 ns steps)
• 8 gated or latching scalers with 1kx32FIFO per channel
• 8 bit coincidence register
• 4 combinatorial gates (2 fold OR of 8 fold AND)
• Flexible configuration and multiplexing of NIM inputs / outputs and logic devices
• Programmable Veto inputs
• VME triggering of logic devices and reset of scalers