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Many of the informations the original poster has been asking for is contained in the Virtual JTAG Megafunction User Guide 2.0 (Dec. 2008). Did you review it?
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thx for your reply,
i think that isnot my needs, now i want to use miccontroller to communicate to the FPGA via its jtag_uart ,the fpga is running and cant hang up,so,i wanna kown how the jtag_uart transe data. and i found the the jtag instruct 'oxc,oxe' and send /recive data such as "1+flag+8bit(byte)" that the meaning is that use 10 bit to transe a byte. then i cant guass the init /handshake ;and "instructions with code 0xC and 0xE appear quite often"
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