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What items to checked if initial operation is not working correctly?

Latest Updated:03/23/2009

Question:

The board has been made, but initial operation is not working correctly. What items should be checked?

Answer:

Please check the following.

1) Is each power supply supplied correctly?

2) Is a correct potential applied?

3) Are clocks input to SH-4?

4) Is RESET negated(High)?

5) Is MRST negated(High)?

6) When using H-UDI: Is TRST driven low for a period overlapping RESET at power-on?

When not using H-UDI: Is TRST fixed to the ground or connected to the same signal line as RESET?

7) Are MODE<8:0> or MODE<10:0> fixed to each setting level ('High" or 'low')?

8) Does CKIO output expected frequency?

9) Is access to Area0 performed after releasing a power-on reset

(SH-4 accesses to h'a000 0000 when a power-on reset is released).

10) Is RDY asserted (low)? (RDY at high means wait.)

11) CA pin is reserved pin in the SH7750, but please pull up CA pin at +3.3V.

(CA pin must be pulled up externally when hardware standby is not used).

Suitable Products
SH7751R
SH7751
SH7750S
SH7750R