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LS1021a TAP Error

Question asked by James Gibbs on Aug 9, 2016
Latest reply on Dec 11, 2019 by Arjun Warrier

I am bringing up a custom board which very closely resembles the TWR evaluation board.  The attached Flash and DDR3L are identical.  We also use the same clocking IC and scheme. I've verified the clocks and power to the LS1021a


I can successfully "Erase and Program" the TWR evaluation board with Codewarrior 10.0.7 using an USB attached Codewarrior TAP.  When I execute the same programming task (in this case, just a write of the RCW) when attached to our custom board I get the following error:


Error: Connect failed.

Unknown protocol error (CCSProtocolPlugin)

Error: Connect failed.


The "TX/RX" light on the Codewarrior TAP is blinking green when I'm not executing the task. When I execute the task it briefly blinks red. The "Run/Pause" light on the Codewarrior TAP is constant red.


Any suggestions on what might be causing this?