Sony CXD5602 User Manual page 32

The notation examples are as follows.

5-bit unsigned signal with integer number is noted as U5.0.

5-bit unsigned signal with decimal point [1].[0] position is noted as U4.1.

5-bit unsigned signal with decimal point [-1].[-2] position is noted as U6.-1.

5-bit signed signal with integer number is noted as S4.0.

5-bit signed signal with decimal point [1].[0] position is noted as S3.1.
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CXD5602 User Manual