hello everyone I need help with writing jtag hardware description file. i'm not skilled yet. I'm playing with ppc ibm 403gcx equipped board. bsdl file isn't available. however got pinout from manufacturer pdf, and after some playing with urjtag + simple logic analyzer I managed to pinpoint all needed data register bits for manipulationg flash with EXTEST command. banging from pregenerated script let me read whole flash contents. however, I really prefer to program memory with urjtag offered commands and hopefully prototype bus. I came across some problem while reconstructing urjtag hardware description file. I noticed that data register bits corresponding to data/address are organized different after shifting out than when shifting in. 'dr' readout bitstream is shifted by one bit number compared with bit places (data/addr) when shifting data register contents in. for example bits to setup data bus (flash organized 512k x 8) occupy 21-30 bsr bits (with 2 bits gap inside), while data bus readout bits are reflected on 22-31 bsr bitstream.
how to describe function of 22 dr bit then? cpu data line is of I/O type ofc. shifted out bit 22 reflects state of D7 (data bus 7-th line), while that same bsr bit at shifting-in is devoted to setup D6 data line. I know of control cells, and probably found a few, but all examples/explanations i found show that bidirs are composed of 3 cells. where data seen on input pin is latched by some cell & presented on 'n' bsr bit, data to setup that pin state, when at output,must be shifted in on n+1 position (or another neighbour position) to set another cell. and one another control cell that controls direction / hi-impedance state of one/group of 'pins'. no pin representing bits are overlapped in respect to this idea. in my case something is overlapping :( what to do with this? is writing a dedicated bus type to overcome this probl. is really needed? please help with people with this. BR, Matheo Are there any public resources describing such deviations in boundary scanning rules ? Please guys, help. I'm resending this post again. _____________________________________________________________ Join the fastest growing e-mail service in the Pilippines. It's Free. It's cool. Go to http://www.e-mail.ph and Sign up now. ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ UrJTAG-development mailing list UrJTAG-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/urjtag-development
