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ST92195D Datasheet(PDF) 162 Page - STMicroelectronics |
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ST92195D Datasheet(HTML) 162 Page - STMicroelectronics |
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162 / 249 page  162/249 ST92195C/D - TELETEXT SLICER AND ACQUISITION UNIT TELETEXT SLICER AND ACQUISITION UNIT (Cont’d) Hamming 8/4 correction: HDE[7:0]: on writing, these 8 bits are the data to be Hamming 8/4 checked, where P are Hamming bits D are Data bits. HDE[23:8]: don't care. ACQHD2R ACQHD1R ACQHD0R On reading, the bits are redefined as follows: ACQHD2R ACQHD1R ACQHD0R Bits 23:5 = Don't care Bit 4 = ERR: Hamming Error. This bit is set by hardware and cleared by soft- ware. 0: The 24-bit word is correctly Hamming decoded (no error or a recoverable error). 1: The result of the Hamming decoding is wrong (unrecoverable error). Note: The D[4:1] bits are cleared by hardware when ERR=1. Bits 3:0 = D4-D1: Data 70 X XXX XX XX 70 X XXX XX XX 70 D4 P D3 P D2 P D1 P 23 16 0 000 00 00 15 8 0 000 00 00 70 0 0 0 ERR D4 D3 D2 D1 |
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