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Using EK-TM4C1294XL Debug Out to program multiple Tiva C devices.

Oliver Douglas69
Intellectual 320 points
Other Parts Discussed in Thread: TM4C1294NCPDT, TM4C123GH6PM, EK-TM4C1294XL

Hello,

I am designing a board that will include a TM4C1294NCPDT and a TM4C123GH6PM. I plan to use the CLP Debug capability of my EK-TM4C1294XL to program and debug these two devices. Since space on the target board is quite constrained, I would like to use a single 10-position, 1.27mm header (the same as U6 on EK-TM4C1294XL) to connect to the debug probe.

Can the debug probe on the EK-TM4C1294XL connect to a JTAG scan chain with multiple active Tiva C devices?

If not, can the two target devices share TMS, TDO, and TDI signals, as long as the TCK and RESET signals are distinct? In this case I would use a jumper (or two) to control which target device's TCK and RESET connect to the debug header. The non-connected TCK and RESET would be pulled up to VCC.

Is either of these options reasonable?

Thanks!