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Section 28 Data Slicer
28.1
Overview
The data slicer extracts signals for closed caption signal in the U.S. This function can be used to
extract caption data superimposed on the vertical blanking interval of TV video signals.
A high-performance internal sync separator enables reliable caption data extraction.
The data slicer will not operate when 448 times the horizontal sync frequency is selected for the
AFC reference clock frequency. For details, refer to section 27.3.6, Automatic Frequency
Controller (AFC).
28.1.1
Features
•
Slice lines: 4 lines
•
Slice levels: 7 levels
•
Sampling clock: Generated by AFC
•
Slice interrupt: A slice completion interrupt is generated at the end of all slices in a field
•
Error detection: Clock run-in, start bit, and data end