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DS90UB941AS-Q1: application

Part Number: DS90UB941AS-Q1


Customer confused that “For splitter mode with external REFCLK, the most basic option is to use REFCLK0 = PCLK0 and REFCLK1=PCLK1.”in 941AS datasheet, however,datasheet also describes that "only in independent 2:2 mode,you can configure REFCLK0 = PCLK0 and REFCLK1=PCLK1“,then in single DSI split screen condition, how to configure REFCLK0 = PCLK0 and REFCLK1=PCLK1target purpose is that it can configure REFCLK0 & REFCLK1 up to105M, to support per port .

BTW,customer thinks that,  clock mode is 01, the mean is External Reference Clock Mode, then according to 0x3e,0x3f description,put external clock in fractional frequency at least 2 fractional frequency,the mean is REFCLK0 = REFCLK1 = 210M, then according to fractional frequency, per port pclk up to 105M, in this condition, external input clock should be configured to a maximum of 210M. Is it right ?

  • Hi,

    in splitting mode the 941AS can use REFCLK0 = PCLK0 and REFCLK1=PCLK1. To configure the ports clock source to be in External Reference Clock Mode set the BRIDGE_CLK_MODE register to 01, then change the TX_PORT_SEL register to port 1 and set the BRIDGE_CLK_MODE  to 01.

    If you would like to use one External Reference Clock is splitting mode the refclk will need to be double the PCLK. 

    Regards,

    Michael W.