Check TRST connection on your board.
The TAP signals must be configured as follows to reset the scan chain logic: If both the TAP and low power mode are never used, connect TRST to ground. If the TAP or low power mode is used, connect TRST to PORESET. If power down mode (the lowest power mode, where VDDH is disabled) is used, connect TRST to PORESET through a diode (anode to TRST, cathode to PORESET). The TRST has internal pull-up resistor. Typical value of this resistor is about 5kOm but can vary by approximately a factor of 2.
Is there problem for connection if the MPC860FADS board is used?
Is there possibility to test your board and USB TAP under Windows XP?
Have a great day,
Pavel Chubakov
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