ICSP和JTAG之间的差异

ICSP是专有的，而JTAG是标准的，YEP。更强大的，虽然我从来没有使用过它。但是，正如你所说，最好的解决方案可以依赖于实际项目…



      以下为原文

    ICSP is proprietary while JTAG is standard, yep. And more powerful, though I never used it so far.
 
Still, as you say, best solution can depend upon the actual project...

ICSP是JTAG上的包装器。包装是通过在PGCED上复用3个JTAG线来完成的。多路复用是4:1，所以ICSP比JTAG慢4倍（其他所有的都相等）。当然，对于大多数在别处浪费时间并且不太接近理论上可行的速度的工具（例如10-15秒来完全编程2048K PIC32MZ）来说可能并不重要。JTAG的一个问题是它需要PIC来运行。例如，如果一个晶体不好，并且PIC没有运行，那么您就不能用JTAG重新编程它。ICSP启动到特殊的内部振荡器模式，所以它总是可以编程的PIC（但你仍然需要良好的功率，解耦电容器等）。此外，JTAG可能被禁用，而ICSP不能。因此，如果只有JTAG连接器，则可能会被锁定。这不会发生在ICSP上。ICSP是专有的，但是它在编程规范中有很好的文档。JTAG是开放的，但不要期望通用的JTAG工具能够对PIC编程。要做到这一点，您只能使用专门支持PIC32 MZ的工具。



      以下为原文

    ICSP is a wrapper on JTAG. The wrapping is done by multiplexing 3 JTAG lines on PGCED. The multiplexing is 4:1, so ICSP is 4 times slower than JTAG (with everything else equal). Of course, it may not matter with most of the tools which waste time elsewhere and don't come too close to theoretically feasible speeds (such as 10-15 sec to fully program 2048K PIC32MZ).
 
A problem with JTAG is that it requires the PIC to run. For example, if a crystal is bad and the PIC doesn't run, you won't be able to re-program it with JTAG. ICSP boots into special internal-oscillator mode, so it can always program the PIC (but you still need good power, decoupling capacitors etc.). Also, JTAG may be disabled while ICSP cannot. Therefore, if you only have a JTAG connector, you may get locked out. This won't happen to ICSP.
 
ICSP is proprietary, but it is very well documented in Programming Specifications. JTAG is open, but don't expect the general JTAG tools to be able to program the PIC. To do so, you can only use tools which specifically support PIC32MZ.
 

谢谢大家！看来ICSP是我们项目的出路，还有一个问题。我仍然对连接器感到困惑。似乎真正的ICE使用RJ-11连接器，而我们购买的开发板（即CHIPKIT WiFire）使用PICTIT3连接器。有什么区别？我们在哪里可以找到更多的信息？



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    Thank you, all! It seems that ICSP is the way to go for our project.
 
One more question. I'm still confused about the connector. It seems that Real Ice uses an RJ-11 connector, while a development board that we bought (namely, the chipKIT Wi-FIRE) uses the PICkit3 connector. What's the difference? Where can we find more information about that?

PICTIT3到RJ11HTTPS://www. GooL.CZ/URL…M8J7RUSPFQLZABTPQ6LMQ



      以下为原文

    PicKit3 to RJ 11
https://www.google.cz/url...m8j7RuPSFQlzabtpQ6-LMQ

AndreaC，我从来没有找到一个很好的理由搬到JTAG，多年来一直使用ICSP编程和调试，以最小的问题。我目前的项目是PIC32 MZ，使用Realice，它运行良好：-祝你好运！



      以下为原文

    AndreaC,
 
I have never found a good reason to move to JTAG, been using ICSP for programming and debugging for years with minimal problems. My current project is a PIC32MZ using the RealICE and it works well :-)
 
Good Luck!