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Hello, I am trying to write a project to a TMS320F28335. The device is in a circuit board with other chips/components and uses the buffered JTAG interface for programming in circuit. The chip is soldered directly to the board so I cannot remove it. I have 3 of said boards; 2 of which have nearly the same problem (I can't write to the chip) and the 3rd works fine. I am using SDFlash to write to the chip and when I do, I get "OTIS error, Error = -1135" but there are no resources I could find to tell me what that error code means. It also tells me "Failed emulation connection to target".
I have scoped the individual pins that the JTAG connects to on the chip and generally compared that to the signals on the board/chip that works fine and there isn't a noticeable difference. This also tells me that the signal is getting to the chip so there shouldn't be a problem with the buffer circuitry. I have checked all the power pins on the chip to ensure it is receiving the appropriate power and the same for the oscillator input/output. The chip on the board was replaced by TI and still the same problem. On the 2 boards/chips that don't work, they never worked to get any programming done so that boards are essentially brand new. This board is in produced by my company and there usually no problems like this. Any help or suggestions would be much appreciated! I would like to know more on the error code too.
