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

Dan,

some words on the USB key:

the bottleneck that limits debugging speed is the way how the SX20 on the SX-Key and the target SX communicate during a debugging session, and not the serial communication between the IDE and the SX-Key. The intra-SX communications can't simply made faster because the debugging process may not steal away too many clock cycles from the target SX, or the target's clock timing would be completely messed up. You may notice that even now, with the current timing between the target and the SX-Key, some jitter is caused while the device is debugged.

Therefore, switching to the FTDI direct drivers would not mean a speed increase. On the other hand, many users might have already installed the VCP driver for their SX-Blitz USB, or a Parallax USB/RS232 adapter, so the same driver can also be used for the SX-Key USB.

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