Is there the Power up sequence of DS90UB914A?
Is there the Power down sequence of DS90UB914A?
What should be written to registers of Reserved. 0? or 1?
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Is there the Power up sequence of DS90UB914A?
Is there the Power down sequence of DS90UB914A?
What should be written to registers of Reserved. 0? or 1?
Sato-san,
I believe that this question would be better answered in this forum.
Hello,
As mentioned in datasheet, please DO NOT write to reserved registers. No initialization needs to occur from the customer as these registers are already initialized internally and should not be written to. Some registers have 1 value and others 0 so in order to ensure correct operation of FPD-Link system, please tell your customers not to initialize reserved registers. See page 34 of 914A datasheet for Note (1) which describes this.
It is also not recommended to initialize registers that are not reserved (public registers). A lot of times, customers will try to initialize public registers and cause issues with the system because they write the wrong value. Public registers SHOULD NOT be initialized, identical to reserved registers.
The only registers that should be changed are ones that customer explicitly wants to change functionality of from default. The FPD-Link devices are made to start-up with registers initialized to prevent customers from having to perform initialization after power-up over I2C. Thank you.
-Sean
Dear Sean-san:
Thank you for your quick reply.
I understood about reserved register.
How about reserved bit?
For example, what should be written to 914A.0x01[7:6]?
And is all reserved bits the same value?
Best Regards,
Masaaki Sugiyama
Sean-san
Thank you for your kind support.
I will replay my customer by the contents mentioned above.
Best Regards,
Masaaki Sugiyama