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The MESA 7I90HD is a very low cost, general purpose, FPGA based programmable I/O card with a EPP parallel, RS-422 serial or SPI host interface. Dual FPGA configuration EEPROMs allow simple recovery from programming mistakes. Firmware modules
are provided for hardware step generation, quadrature encoder
counting, PWM generation, digital I/O, Smart Serial remote I/O, BISS,
SSI, SPI, UART interfaces and more. All motion control firmware is open source and easily modified to support new functions or different mixes of functions. All
I/O bits are 5V tolerant and can sink 24 mA. All I/O pins support 3.3V
LVDS signaling. Socketed pullup resistors are provided for all pins so
that they may be connected directly to opto-isolators, contacts etc.
The 7I90HD has 72 I/O bits available on three 50 pin connectors, all
connectors use I/O module rack compatible pinouts and are compatible
with all Mesa 50 pin FPGA daughtercards.
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