cbmeeks wrote:
I finally ordered me a couple ATF1504AS's from Mouser.
I also ordered a few PLCC-44 to DIP 40's that were really cheap.
However, I have no idea how it's mapped so it looks like I will be loosing 4 pins. So I may have to hack 4 wires somehow to get all of the pins.
Every pin on the 1504 is "live," so you definitely want all of them brought out. In POC V2, I used all of them.
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So, that being said, are there any recommendations on building or buying a JTAG programmer for these? Are there any homebrew ways to build them or should I just buy one of the many cheap Chinese versions off eBay?
Atmel produces a
USB-compatible cable that you can connect to the JTAG port that you are going to build into your unit (that page also points to their ISP software, which you will need).
Mouser shows two in stock, with a slightly lower price than quoted on the Atmel site.
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Is it worth spending more for a better quality one?
Definitely. The Atmel part isn't that much money, all things considered. You'll have enough work developing functional logic without having to also contend with a substandard programming device that could end up damaging one of your CPLDs. With the Atmel part, you'll know that it will be compatible with their ISP software. I have the parallel port version and it works fine. I've used it several times to change the logic in-circuit in the 1504 in POC V2.