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When I use Boundary Scan tools like EXTEST to verify MPC8308 connectivity  ,I can't get valid data from the TDO pin of the MPC8308.Why ?

Question asked by KAI Liu on May 29, 2016
Latest reply on May 29, 2016 by Pavel Chubakov

I can use the IDCODE instruction get the right IDCODE number and the BYPASS instruction also work ,but when I use the EXTEST intruction test the MPC8308 connectivity ,I can't get right data from TDO. The BOUNDARY_LENGTH of MPC8308 is 491.The data first out  is 314 bit which I got from TDO ,and the rest are all zero,when I use the EXTEST instruction test the MPC8308.