However, CPLD's seem to be programmed through a JTAG interface, which should be doable for the Arduino. (I've heard National and TI are pretty nice. Also expect as parts are redesigned to be faster, the old programming algorithms may be obselete, or have certain parameters in them shift.īut if you are convincing, some of the manufacturers will give you the information on a nondisclosure basis. Expect most CMOS parts to have proprietary algorithms. So, starting around 1985, most manufacturers have removed this information from their databooks. Some of them don't want to spend a lot of money trying to figure out why you (and thousands others like you) can't get parts to program (or worse, stay programmed) using your homemade programmer. Some them make money by selling programmers and software. "First, be aware that the manufacturers don't feel it's in their interest to give you enough information to build one. Programming GAL devices may be more difficult, from
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