DS90UB941AS-Q1: trigger of DE mode and HV mode

Hi Logan,

Thanks for your reply.

1. Adjusting the DE polarity means adjusting the effective rising and falling edges?
2. Don’t care about the polarity of the 948 register? After customer changed DE polartiy in 941, the default value here is still 0, which feels a bit strange..

Hi Amelie, 

I don't completely follow. 

Does the customer only want to invert the DE polarity, is that what you mean by adjusting the effective edges? 

The FRC register is the incorrect register. You need to refer to register 0x22 in the DES. 

Regards, 

Logan

Hi Logan:

   1. We want to adjust the effective edges about vs/hs/de.

   2. After changing the DE polarity on the 0x22,  the FRC_CONTROL register remains default value. Is it ok?

Hi Chen, 

chen zh said:

We want to adjust the effective edges about vs/hs/de.

What do you mean by "effective edges"? Are you referring to the polarity?

chen zh said:

   2. After changing the DE polarity on the 0x22,  the FRC_CONTROL register remains default value. Is it ok?

This is okay. FRC_CONTROL is unrelated. You need to change 0x22 instead. 

Regards, 

Logan

Hi Logan:

1. Is it effective to adjust the rising and falling edges by adjusting the polarity,? 

2. Why only adjust datapath_ De of CTL_ Polyartiy, no need to adjust DSI_ CONFIG_ 1 vs_ polartiy/hs_ polarity？

Hi Chen, 

Yes, switching the polarity will technically change the effective edge, as shown below. 

chen zh said:

2. Why only adjust datapath_ De of CTL_ Polyartiy, no need to adjust DSI_ CONFIG_ 1 vs_ polartiy/hs_ polarity？

DATAPATH_CTL 0x12,

DSI_CONFIG_1 0x21,

Changing DE polarity in 941 via DATAPATH_CTL (0x12) should automatically load the DE setting in 948 deserializer (0x22). 

Register 0x21 DSI_CONFIG is for DSI input to 941. 

Regards, 

Logan