Suggestions for JTAG that's fast at single step debugging?


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    Paul Curtis

    FTDI-based devices are great when blasting in one direction (writing), but suffer from USB latencies when reading.  Basically, to read something, like memory, you need to write a command, wait for a the next USB slot to read, wait for the next to write, and those slots are 1ms apart.  So, programming is fast, but reading back memory is slow.

    I suggest getting something with intelligence, such as a CrossConnect...  :-)  When reading, the read is done in the box, closer to the micro, and not hand-constructed on the PC.  However, backtracing requires quite a bit of reading, as does populating the Threads window if you're running a script.  But a CrossConnect will certainly be faster!


    -- Paul

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