There's some device that I want to connect to my ez80f910300zcog kit. In its techspec it is stated that reset line is internally pulled up to 3.3V via 4k7 resistor. An active low pulse greater than 2ms will reset the module. The host should control this pin using an open collector/drain arrangement. As I already know, RESET line is open drain arranged in ez80, however I don't know yet what happens with this line on the way through ez80 module and development board. Do you know if it is safe to connect reset lines of these devices?

Paul
The module Reset switch is connected to a 10K pull up resistor and ZDI interface, which then goes through an OR gate with the JTAG reset then through a buffer. The output of the buffer connects the TVCC_RESET pin of the JTAG interface with a 1K pull up to the reset pin of the eZ80.

The development kit user manual has the schematics for the development kit:

eZ80F91 Modular Development Kit User manual

This arrangement allows for the reset to be generated by the JTAG, ZDI or switch. Depending on when you want the attached device to respond to a reset would dictate where you would interface into the reset circuit.