Lpc2000

Hi Tom,

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.

Michael

>--- In lpc2000@yahoogroups.com, Rob Jansen <rob@m...> wrote:
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>>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
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>for 
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>>the software to arrive (someone misplaced the CDs ...)
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>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.
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>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
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>Yahoo! Groups Links
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