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How bad is debugging logic running purely on hardware nowadays? Is there anything more user-friendly than tapping specific lines and watching the output on an o
by bramen 10y ago
How bad is debugging logic running purely on hardware nowadays? Is there anything more user-friendly than tapping specific lines and watching the output on an oscilloscope?
- klodolph 10y agoHow do you propose tapping a line on a piece of silicon with a 14nm feature size?
- adrianN 10y agoAsk this guy http://www.huffingtonpost.co.uk/rachel-preece/graham-short-the-worlds-s_b_1259356.html http://www.huffingtonpost.co.uk/rachel-preece/graham-short-t...
- amelius 10y agoYes, you can debug on an FPGA first, for example, allowing you to put the hardware-equivalent of a printf statement in places where you need them. Or, you can configure all of your flipflops into a barrel shift register, so you can read out their contents serially (and shift their contents back in circularly). But there are many more techniques.
- bramen 10y agoInteresting. Thanks, you've given me a few things to read up on.
- dnautics 10y agoUsually you start at the verilog level with simulators (I've done this professionally with zero hardware experience and discovered many critical bugs in a chip that's now taped out. Of course the real engineers had to fix them.) Now that it's gone physical, after a series of very low level tests, they will take similar software and adapt it to the interface for hardware instead and repeat all the tests.
- bramen 10y agoAh makes sense. Thanks for the info, will look into this.