A method and chip for safely switching chip working modes arbitrarily
A working mode, switching chip technology, applied in simulators, program control, instruments, etc., can solve problems such as complex requirements and troublesome use of chips
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[0012] Existing switching circuits generally use digital analysis methods, which are vulnerable to external interference and wrong switching during work. Take sending 011101 signals to switch the normal working mode of the chip to the test mode as an example; figure 1 As shown, in the normal working mode, you want to send 001101 to the chip. When it is greater than VIH, it is judged as logic 1, and when it is less than VIL, it is judged as logic 0. When there are no interference factors, everything works normally, and the chip receives the signal of 001101.
[0013] However, due to the interference of factors such as the environment, the voltage of the data signal changes, such as figure 2 As shown, due to the influence of interference, the voltage received by the chip fluctuates. In the second time slot, the voltage that should be less than VIL becomes greater than VIH. At this time, the second bit of the normal data signal 001101 is changed from 0 to 0 by mistake. It become...
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