Part Number: SM320F28335-EP
Tool/software: Code Composer Studio
Hi , I want to know the possible cause for the following circumstance.
I try connecting to F28335 MCU on my custom board for debag.
But, I can not connect with CCS and XDS200.
During connecting to the target devise, CCS outputs error code. The error code is "Error -1015"
With same CCS setting and XDS200, I can connect to F28335 MCU on TMS320F28335 controlCARD.
Therefore, I compared each JTAG signals, EMU0,EMU1,TMS,TRST,TDO,TDI,TCK during error code appearing.
As a result, TDO was different form case of TMS320F28335 controlCARD.
In case of custom board, default is low, sometime high during connecting sequence.
In case of TMS320F28335 controlCARD, default is high and pulsed for connection during connecting sequence.
The connection is good between XDS200 and the target device.
And, the circuit between JTAG connector and the target device may be good. (EMU0, EMU1 is pulled up with 4.7kohm. And, TRST is pulled down with 2.2kohm.)
Is this trouble cause the TDO signal's abnormal?