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TAS5731: TAS5731 register question

Part Number: TAS5731


  In the TAS5731 datasheet, there are many registers which named like u[31:26], b0[25:0].etc, take 0X29 or 0X2A for example.

I'd like to know what does the u[31:26] mean? I didn't find any description about it, please give me some advice.

Thank you 

Best regards