In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

1) Did you install the FDTI virtual comm port driver on the PC? You should have done this BEFORE you connect the SX-Blitz USB the first time.
2) When the drivers are installed correctly, try the following:
- unplug the SX-Blitz, launch the SX-Key IDE, select "Run - Configure" and memorize the available COM ports listed.
- shut down the IDE, plug in the SX-Blitz, and launch the IDE again.
- Select "Run - Configure" - the list of available COM ports should have a new entry now - the one for die SX-Blitz, so select this one.
3) Try to program the SX again.

When you get an error like "chip connection failed", this indicates that the IDE and the SX-Blitz have established communications (otherwise, you would get an error like "SX-Key/Blitz not found on COM 9") but that the communication between the SX-Blitz and the SX chip has failed. Often the problem is simply gone when you re-try programming.

Other reasons for this error can be bad electrical connections (SX-Blitz to 4-pin header, SX to socket), or a weak power supply. A tantalum cap of 47µF between Vdd and Vss often helps a lot.

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