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CORE429-SN Datasheet(PDF) 3 Page - Actel Corporation |
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CORE429-SN Datasheet(HTML) 3 Page - Actel Corporation |
3 / 22 page ![]() ARINC 429 Bus Interface v5.0 3 • Sign/Status Matrix •Data • Source/Destination Identifiers •Label The parity bit is bit 32 (the MSB). SSM is the Sign/Status Matrix and is included as bits 30 and 31. Bits 11 to 29 contain the data. Binary Coded Decimal (BCD) and binary encoding (BNR) are common ARINC data formats. Data formats can also be mixed. Bits 9 and 10 are Source/ Destination Identifiers (SDI) and indicate for which receiver the data is intended. Bits 1 to 8 contain a label (label words) identifying the data type. Label words are quite specific in ARINC 429. Each aircraft may be equipped with different electronic equipment and systems needing interconnection. A large amount of equipment may be involved, depending on the aircraft. The ARINC specification identifies the equipment ID, a series of digital identification numbers. Examples of equipment are Flight Management Computers, Inertial Reference Systems, Fuel Tanks, Tire Pressure Monitoring Systems, and GPS Sensors. Transmission Order The least significant bit of each byte, except the label, is transmitted first, and the label is transmitted ahead of the data in each case. The order of the bits transmitted on the ARINC bus is as follows: 8, 7, 6, 5, 4, 3, 2, 1, 9, 10, 11, 12, 13 … 32. Core429 Device Requirements Core429 can be implemented in several Actel FPGA devices. Table 1 through Table 5 on page 4 provide typical utilization figures using standard synthesis tools for different Core429 configurations. Table 1 assumes that the label size is set to 64 and FIFO depth is set to 64. Figure 3 • ARINC Data Bit Positions 32 31 11 10 9 LABEL 30 29 1 8 LSB DATA PAD DISCRETES SDI P SSM MSB Table 1 • Device Utilization for One Tx Module Cells or Tiles Family Combinatorial Sequential Total Memory Blocks Device Utilization Fusion 363 147 510 1 AFS600 4% ProASIC3/E 363 147 510 1 A3PE600 4% ProASICPLUS 441 146 587 1 APA075 19% Axcelerator 212 145 357 1 AX125 18% RTAX-S 258 171 429 1 RTAX250S 10% Table 2 • Device Utilization for One Rx Module Cells or Tiles Family Combinatorial Sequential Total Memory Blocks Devices Utilization Fusion 431 233 664 2 AFS600 5% ProASIC3/E 431 233 664 2 A3PE600 5% ProASICPLUS 588 236 824 2 APA075 27% Axcelerator 307 234 541 2 AX125 27% RTAX-S 350 259 609 2 RTAX250S 14% |
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