Hi Team,
I have a customer who is using the K2G02 in their system and they have some questions:
Refer to my "JTAG" drawing (only visible to TI employees here --> ), JTAG signals are buffered.
Q1: Do we need pullup resistor for EMU00, EMU01, TDO, TCK, TDI, TRSTn and TMS? If so, is it 4.7Kohm or 10Kohm?
Q2: Can we eliminate the 1-bit buffer, SN74AVC1T45DBVR, and move SOC_TDO to A5 of SN74AVC8T245RHL (currently, A5 is not used and grounded in my drawing) and MIPI_TDO to B5 of SN74AVC8T245RHL? Since TDO is the only output pins on K2G I am not sure to have separate 1-bit buffer design on EVMK2G is for trace path or other reasons.
Q3: The 22ohm series resistors for SOC_TCK and MIPI_RTCK are for unbuffered configuration in Table 17 of spru655i. Should I use the same 22ohm series resistors for SOC_TCK and MIPI_RTCK in my buffered-configuration design as in EVMK2G(also has buffered configuration)?
Q4: This custom board will serve the purposes for both R&D and end-product. For product, we won't populate MIPI 60 header, series resistors, pull-up/pull-down resistors and buffers. Does my design (check my drawings) take care of both R&D and product cases? Do I miss anything?
Thanks,
Brian