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HI-8282ACDM Datasheet(PDF) 6 Page - Holt Integrated Circuits |
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HI-8282ACDM Datasheet(HTML) 6 Page - Holt Integrated Circuits |
6 / 14 page REPEATER OPERATION The repeater mode of operation allowsa data word that has been received by the HI-8282A to be placed directly into its FIFO for transmission. Aftera 32-bit word has been shifted into the receiver shift register, the flag will go low. A logic "0" is placed on the SEL line and is strobed. This is the same procedure as for normal receiver operation and it places the lower byte (16) of the data word on the data bus. By strobing at the same D/R EN PL1 time as , the byte EN HI-8282A will also be placed into the transmitter FIFO. SEL is then taken high and is strobed again to place the upper byte of the data word on the data bus. By strobing at the same time as , the second byte will also be placed into the FIFO. The data word is now ready to be transmitted according to the parity programmed into the control word register. In normal operation, either byte ofa received data word may be read from the receiver latches first by use of SEL input. During repeater operation however, the lower byte of the data word must be read first. This is necessary because, as the data is being read, it is also being loaded into the FIFO and the transmitter FIFO is always loaded with the lower byte of the data word first. EN PL2 EN 429DO 429DO ARINC BIT NULL DATA DATA DATA NULL NULL WORD GAP BIT 1 NEXT WORD BIT 32 BIT 31 BIT 30 CWHLD t CWSET t CWSTR t DATA BUS CWSTR VALID DATA BUS SELEN t D/R t ENSEL t DATAEN t D/REN t END/R t EN t ENSEL t SELEN t DATAEN t ENDATA t ENDATA t ENEN t BYTE1 VALID BYTE2 VALID HOLT INTEGRATED CIRCUITS 6 |
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