7I90HD 1
GENERAL
DESCRIPTION
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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