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Remarks:
When you use an oscilloscope to judge whether a signal to be tested is normal or NG, perform the
signal check in exactly the same order as in [List 1]. (If the ASIC fails to access the ROM, the ASIC
cannot access SRAM or DRAM normally.)
The digital circuit actually operates according to the timing combinations of these signals. If the
timing of these signals is even slightly delayed, the circuit will not work. Nor will it if the IC is
defective and the output voltage level is notnormal although the timing of these signals is accurate
enough to meet the specifications. (Make sure that your oscilloscope is calibrated before starting a
test.)
Therefore, it is imperative to confirm whether each IC outputs the signal at the correct level. (See the
I/O Pin No. Diagram
.) The signal level should be constantly output at between 5V (H) and 0V (L)
as described earlier.
Note:
Simply check the output level and make sure if the IC repeatedly outputs the signal at between 5V
(H) and 0V (L).
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27. 10. 2004
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