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Digital Output Randomizer and Alternate Bit Polarity in DDR CMOS mode of LTC2183

Hi 

I will uses Digital Output Randomizer and Alternate Bit Polarity in  DDR CMOS mode of LTC2183.

Does LTC2183 execute Digital Output Randomizer and Alternate Bit Polarity before changing from SDR(Single data rate) to DDR(Double data rate)?

Best regards

N.Kokubo

  • Hi

    I explain the question in another way.

    In case of Digital Output Randomizer in Full-Rate CMOS mode, D1_2 outputs EXOR of D1_0 and D1_2. D1_3 outputs EXOR of D1_0 and D1_3.

    In case of Digital Output Randomizer in Double Data Rate CMOS mode,does BIT0 of D1_2_3 output EXOR of D1_0 and D1_2? Deos BIT1 of D1_2_3 output  EXOR of D1_0 and D1_3?

    Or in case of Digital Output Randomizer in Double Data Rate CMOS mode,does BIT0 of D1_2_3 output EXOR of BIT0 D1_0_1 and BIT0 of D1_2_3? Deos BIT1 of D1_2_3 output  EXOR of BIT1 of D1_0_1 and BIT1 of D1_2_3?

    In case of Alternate Bit Polarity in Full-Rate CMOS mode, all of the odd bits are inverted.

    In case of Alternate Bit Polarity in Double Data Rate CMOS mode,are BIT1 of D1_2_3 inverted?  Aren’t  BIT0 of D1_2_3 inverted?

    Or in case of Alternate Bit Polarity in Double Data Rate CMOS mode,are BIT0 and BIT1 of D1_2_3 inverted?  Aren’t  BIT0 and BIT1 of D1_0_1 inverted?

    Best regards

    N.Kokubo