GritsTM Programmable IO Board
GritsTM – Fully programmable PC/104 bus I/O Board, using surface mount parts. The Grits design is based on the Lattice ispLSI2096E-100LQ128 CPLD, in a 128 pin Plastic Quad Flat Pack (PQFP). There is only one integrated circuit on the board. The Grits design is very versatile, and allows many ways to utilize it for I/O functions. In order to minimize costs, this board is built on a two-sided board (i.e. no power or ground plane layers) with 8 mil lines and spaces.
The Grits Programmable I/O Board was designed with Eagle 4.01, on the GNU/Linux operating system. The same CAD files will work with the Wxx version of Eagle. See the Software page for further information concerning Eagle.
|Specification||Adobe Acrobatversion 3||grits.pdf|
|Schematic, Page 1||.jpg file of schematic, page 1||grits_page1.jpg 05-16-2002, 439k|
|Schematic, Page 2||.jpg file of schematic, page 2||grits_page2.jpg 05-16-2002, 712k|
|CAD source files – DOS/Wxx||zip of Eagle 4.01 files||grits.zip 06-06-2001, 178k|
|CAD source files – GNU/Linux||gzipped tar file of Eagle 4.01 files||grits.tar.gz 06-06-2001. 185k|
|CPLD source files||zip of VHDL, pin, configuration files||gritsvhd.zip 05-29-2001, 2.6k|
|CPLD programming files||zip of JEDEC file||gritspgm.zip 05-29-2001, 1.9k|
|Manufacturing||zip of Gerber/Excellon/text||gritsmfg.zip 06-06-2001, 136k|
NOTE: to unpack the Eagle file in Linux, make a grits directory, copy the grits.tar.gz file into it, and then invoke tar xvzf grits.tar.gz
This will unpack the entire set of CAD and manufacturing files in the grits directory.
Note: The source code for all designs shown here is released under the GNU General Public License.