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by hkwerf 886 days ago
Could you explain why? A JTAG master seems easily bit-bangable unless you require high data rates?
2 comments
bogantech 886 days ago
Indeed my understanding is that it should not require crazy hardware requirements - it's a serial protocol clocked by the programmer.

Here's an Arduino project to program CPLDS/FPGAs using XSVF files https://github.com/wschutzer/xsvfduino

I'd say that the cheap programming cables are abundant and already compatible with the vendor tools so there's not much motivation to reinvent the wheel.

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15155 882 days ago
TMS is hard to manage. High data rates are exactly the issue.

Any MCU can bitbang JTAG at 100kHz. Try doing it at 30 MHz sustained.

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