ARINC-429/575 Interface to VME - Sy429VME-RT32

Transcription

1 ARINC-429/575 Interface to - Sy429-RT32 Summary features ARINC-429 and 575 compatible Modular Architecture Expandable to 32 Channels per card FIFO Rx & Tx data buffers Time-Stamping of Rx data Loop-Back Support Tx Fault Insertion Flexible Interrupts Tx and Rx Channel Monitor Interface Single slot card 3.9 to 167 khz bit rate 64 channel variant available General Description: Occupying a single slot in a chassis. The Sy429-RT32 card offers an easy to use, high performance, interface to 32 ARINC-429/575 channels. The product is modular in architecture, where each module provides 4Tx, 4Rx configuration. Modules are user installable. ARINC-429 or ARINC-575 is software selectable on a per-channel basis. Received data is time-stamped with resolution selectable between 1µS and 255µS. This card is the third generation release of the most widely used ARINC-429 interface in the industry. A 64 channel variant will follow. Receive Sub-System: Received data is time-stamped and stored in a 256 x 32-bit FIFO data buffer for easy access by the host processor. Should an error occur during reception, the error condition is indicated by setting the parity bit (bit 32) of the received data word. Options for deeper receive are available. The cause of a receive error, whether due to parity, bit-count or word gap, can be identified from data in the Rx Error Status FIFO. Each receive channel is configured by writing data to a control register. Data can be received with speeds between 3.9 and 500 k bits/second.

2 Transmit Sub-System: Each transmit channel is individually software configured by writing data to a control register. This provides a choice of 125 separate data rates between 3.9 and 167 k bits/second and control over parity generation, inter-word gap and word-length (ie Fault Insertion) Data for transmission is written to the appropriate Transmit FIFO and, while there is data in the FIFO, transmission is automatic and continuous with the pre-selected minimum gap between ARINC words. A separate FIFO, with a capacity for 128 ARINC-429 words, is provided for each Tx channel. The output from the transmit can be Enabled or Disabled by writing to a register. Options for deeper transmit FIFO are available. The ARINC-429 specification defines separate signal rise and fall times for High Speed and Low Speed operation. The necessary selection of appropriate signal rise and fall time is provided for each channel under software control. Each ARINC-429 driver is capable of driving beyond the maximum distance specified by ARINC. Time-Stamping of Received Data: A 32 bit Timer with a resolution selectable between 1 and 255 µs is provided for Time-Stamping received data. The Time-Stamp for each word received is stored in a separate Time-Stamp FIFO. The data from this FIFO is latched each time the Rx FIFO is read. The user can then read this latched Time-Stamp and be confident that it corresponds to the last ARINC-429 word read from the Rx Data FIFO. The user can select between an internal or external clock source. The timer can also be reset internally or externally and read by the Host Processor. Event Monitoring & Interrupt Facilities: The card provides for monitoring a wide range of system events. When a monitored event occurs, a unique status word is generated and stored in a Status FIFO which can be read by the host system. If the Status FIFO is read when empty, a zero status value is returned. Separate events can be monitored for each channel which include: Tx FIFO status: Empty, 7 / 8 Full Rx FIFO status: Empty, ½ Full Receive error: Parity, Word Length, Word Gap & Rx FIFO overflow The card can be programmed so that interrupts can be generated whenever there is data in the Event- Status FIFO. The cause of the interrupt is identified by reading the Event-Status FIFO. Channel Monitor: A separate receiver is provided to monitor externally any transmit or receive channel. The user can select the channel to be monitored via a register and the received data can be read from a FIFO. This facility is independently controllable and does not interrupt or affect the channel being monitored. The condition of any driver or receiver device can be determined by appropriate use of this channel monitor utility.

3 Support for BITE: The transmit channels can be loop-backed on to the receive channels for test purposes. When a transmit channel is in loop-back mode, the transmissions are disabled on the external ARINC429 data bus. System Interface: The interface provides for 32 bit data and 24 or 32 bit address with address modifiers. A 32-bit read/write data access time of 400nS is typical of this card. A block diagram showing the architecture of the Modular RT32 card is provided below. Block 0 8 Tx & 8 Rx Channels Address Offset 0x000 Module 0 Channels Tx0-3 & Rx0-3 Module 1 Channels Tx4-7 & Rx4-7 Interface Block 1 Address Offset 0x100 8 Tx & 8 Rx Channels Interrupts Module 2 Module 3 Channels Tx8 - B & Rx8 - B Channels TxC - F & RxC - F Block 2 Address Offset 0x200 Channel Monitoring Facility Block 0 Interrupts Block 1 Interrupts Monitor Externally any Tx or Rx Channel Functional Overview of the Sy429-M4 Card

4 A block diagram showing the major features of a RT44 module is provided below. Tx Out Transmit Transmitters Rx Data Time-Tag Receivers Time-Tag Counter Rx In External Clock Reset External Clock Out Select Resolution Event Status FIFO Block Interrupt Logic Not Empty Tx FIFO Status Rx FIFO Status Rx Error 4 channels Select Clock External Clock In 1 MHz Rx Error 4 channels Functional Diagram for Channel Blocks 0 and 1

5 Mechanical Description: The card occupies a single size C slot, with ARINC Input/Output access via the outer two rows of the bus P2 connector or a 96 pin DIN41612 connector mounted on the front panel. The card has also been successfully used in VXI size C chassis where ARINC Input/Output is via the front panel connector. Specification: Power Requirements (maximum) + 5V at 2.5A + 12V at 46mA per Tx channel - 12V at 46mA per Tx channel Address Selection Addressable on 64Kbyte boundaries Interface Compatible with bus (IEC 821) revision C A24 or A32 with Address Modifiers -D32 data Connector Type P1 96-pin DIN41612 P2 96 pin DIN41612 ARINC Input/Output Connector Type J1 96-pin DIN41612 and/or outer rows of the P2 connector. External Clock Input Connector J2 9-pin plug, Micro MDS (ITT Cannon) Operating Temperature 0 C to + 70 C Storage Temperature -25 C to + 85 C Relative Humidity 0 to 95% non-condensing Ordering Information and Variants: Sy429-M4 : Sy : interface 4 module carrier card 4Tx, 4Rx module Contact Details: Sycos AES Hambledon Manor Iwerne Minster Blandford Forum Dorset. DT11 8QS Tel: Fax: e mail: sales@sycos co uk