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T4240 couldn't be programmed by JTAG

Question asked by kun zhang on Dec 18, 2016
Latest reply on Dec 22, 2016 by ufedor



We made a board with reference of T4240RDB, recently we met a problem which is shown in the title. After many checks,

we found an abnormal phenomenon:

  1. the impedance between VDD_OVDD_P1V8 and GND is only 9.2 Ohm,while the impedance between P1V8_AVDD and GND is 2262Ohm.
  2. VDD_OVDD_P1V8
  3. Is there something wrong with the inner part of T4240?