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HI-8584PQTF Datasheet(PDF) 5 Page - Holt Integrated Circuits |
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HI-8584PQTF Datasheet(HTML) 5 Page - Holt Integrated Circuits |
5 / 15 page FUNCTIONAL DESCRIPTION (cont.) HI-8584 FIFO LOAD CONTROL SEL EN CONTROL BIT / R/W CONTROL 32 TO 16 DRIVER 32 BIT SHIFT REGISTER TO PINS CONTROLBITS CR0, CR14 CLOCK OPTION CLOCK CLK BIT COUNTER AND END OF SEQUENCE PARITY CHECK 32ND BIT DATA BIT CLOCK WORD GAP WORD GAP TIMER BIT CLOCK END START SEQUENCE CONTROL ERROR CLOCK ERROR DETECTION SHIFT REGISTER SHIFT REGISTER NULL ZEROS SHIFT REGISTER ONES EOS FIGURE 2. RECEIVER BLOCK DIAGRAM LABEL / DECODE COMPARE 16 x 8 LABEL MEMORY 32 X 32 FIFO D/R FF MUX CONTROL CONTROL BITS HF RECEIVER PARITY The 32nd bit of received ARINC words stored in the receive FIFO is used as a Parity Flag indicating whether good Odd parity is received from the incoming ARINC word. Odd Parity Received The parity bit is reset to indicate correct parity was received and the resulting word is written to the receive FIFO. Even Parity Received The receiver sets the 32nd bit to a “1”, indicating a parity error and the resulting word is then written to the receive FIFO. Therefore, the 32nd bit retrieved from the receiver FIFO will always be “0” when valid (odd parity) ARINC 429 words are received. RETRIEVING DATA Once 32 valid bits are recognized, the receiver logic generates an End of Sequence (EOS). Depending upon the state of control register bits CR2-CR11, the received ARINC 32-bit word is then checked for correct decoding and label matching before being loaded into the 32 x 32 receive FIFO. CR2(3) ARINC word CR6(9) ARINC word FIFO matches bits 9,10 label match CR7,8 (10,11) 0 X 0 X Load FIFO 1 No 0 X Ignore data 1 Yes 0 X Load FIFO 0 X 1 No Ignore data 0 X 1 Yes Load FIFO 1 Yes 1 No Ignore data 1 No 1 Yes Ignore data 1 No 1 No Ignore data 1 Yes 1 Yes Load FIFO ARINC words which do not meet the necessary 9th and 10th ARINC bit or label matching are ignored and are not loaded into the receive FIFO. The following table describes this operation. HOLT INTEGRATED CIRCUITS 5 |
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