Primary functional circuit board suitable for use in verifying chip function by alternative manner

A primary functional circuit board with the capability to verify the chip functions by an alternative manner, comprising:

• a circuit board;
• a chip, disposed on the circuit board;
• a programmable chip, wherein a plurality of signal input/output (I/O) pins of the programmable chip and a plurality of signal I/O pins of the chip are respectively connected one by one;
• and
• a switching device, coupled to the chip and the programmable chip, so as to switch signals of the chip and the programmable chip to select one signal thereof as an output.

A verifying method with the capability to verify the chip function by an alternative manner, suitable for use in a circuit board, wherein the circuit board is implemented with a chip, a programmable chip, and a switching device, and the switching device is coupled to the chip and the programmable chip, so as to switch signals of the chip and the programmable chip to select one signal thereof as an output, the verifying method comprising the steps of:

• (a) enabling the chip and disabling the programmable chip, so as to verify function of the chip;
• (b) enabling programmable chip and disabling the chip, so as to verify function of the programmable chip;
• and
• (c) verifying results from the step of (a) and the step of (b) in an alternative manner.