Re: JTAG RTCK / Jeeni question
The RTCK isn't strictly needed. Without the RTCK if the JTAG port works
slowly, as is the case of the LPC2xxx, then the JTAG cable/debugger has
to put in a delay before it samples the TDO. I'm surprised that
companies are selling JTAG cables that require RTCK - the cynic in me
says it's a way of getting repeat business.
>--- In lpc2000@lpc2..., Rob Jansen <rob@m...> wrote: >>Does anyone have experience with the Jeeni connected to an lpc2xxx?
>>I got a Jeeni (from EPI) on my desk but heard that it will not connect
>>to the lpc2xxx because of the missing RTCK line on its JTAG interface.
>>I was not yet able to verify this myself yet since I'm still waiting
>for >>the software to arrive (someone misplaced the CDs ...)
>I was informed unequivocally by EPI that the LPC family (and any other
>-S series ARM core) was *not* supported by JEENI specifically due to
>the lack of the RTCK interface. This is what forced me to buy another
>JTAG unit to work with the LPCs, specifically, a BDI2000, since I
>needed to continue to use the GDB server-based interface.
>Abitron also stated that the RTCK support was mandatory, quoting the
>same paragraph from the ARM7DMI-S spec noted in an earlier message.
>If this pin really isn't necessary for correct data timing, then
>Philips needs to get the message out to all the JTAG debugger people.
>-- Tom Nelson >Yahoo! Groups Links