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What items that should be confirmed if CS0 signal is not asserted?

Latest Updated:03/23/2009

Question:

After the power-on reset, CS0 signal is not asserted? What are the items that should be confirmed?

Answer:

First of all, please confirm the CKIO signal of SH7618/SH7619 is normally output.

If the CKIO signal of SH7618/SH7619 is normally output, there is a possibility that it changes to the HIF boot mode. When the power-on reset is released with inputting a high level into HIFMD pins, it changed to the HIF boot mode.
After power-on reset is released, the CS0 signal is not asserted to do the program fetch to the on-chip HIFRAM of SH7618/SH7619at the HIF boot mode.

Otherwise, please also confirm

• TESTMD# pin is pull-up processed?
• TRST# is pull-down processed?

Suitable Products
SH7619
SH7618