I want connect the four XMC4800 devices at using JTAG chain. What points do you think I should be careful about?
For example - Whether a buffer is needed If need the buffer. Could you tell me, add buffer to where and a specifications of buffer? - Do I need to change the pull-up and pull-down resistance constants according to the number of devices?
Yes, our kit KIT_XMC_LINK_SEGGER_V1 will support multiple devices on JTAG chain. As you can see from the user manual, KIT_XMC_LINK_SEGGER_V1 debug probe is based on SEGGER J-Link debug firmware. So, we suggest you to refer SEGGER documentation for more details.