NES Cartridge Adapter board - top
A board for interfacing a Nintendo game cartridge to any board supporting the Gadget Factory "wing" header (e.g. the Papilio One or the OpenBench Logic Sniffer).
This is meant for testing my FPGA NES with real game cartridges.
The board uses a Xilinx XC9572 CPLD to perform level-shifting (the NES cartridges are nominally 5V devices) and signal multiplexing (~50 relatively slow signals are muxed down to fit over a 16-bit interface). An IDT QuickSwitch protects the off-board FPGA from the 5V levels driven by the CPLD.
Some jumpers are provided to experiment with running the cartridge at lower voltage levels. Ideally, we'd like to drive just 3.3V signal levels to the cartridge, since CPLDs/FPGAs capable of 5V output are growing increasingly rare.
NES Cartridge Adapter board - top
A board for interfacing a Nintendo game cartridge to any board supporting the Gadget Factory "wing" header (e.g. the Papilio One or the OpenBench Logic Sniffer).
This is meant for testing my FPGA NES with real game cartridges.
The board uses a Xilinx XC9572 CPLD to perform level-shifting (the NES cartridges are nominally 5V devices) and signal multiplexing (~50 relatively slow signals are muxed down to fit over a 16-bit interface). An IDT QuickSwitch protects the off-board FPGA from the 5V levels driven by the CPLD.
Some jumpers are provided to experiment with running the cartridge at lower voltage levels. Ideally, we'd like to drive just 3.3V signal levels to the cartridge, since CPLDs/FPGAs capable of 5V output are growing increasingly rare.