- Radiation Tolerant Dual MIL-STD-1553 PMC
- One MIL-STD-1553B Dual Redundant BC/RT/MT
- ESA ECSS-E-50-12C compliant
- DMA Engine for transfer to/from SBC
- Space qualified, radiation tolerant
- Up to -55 to +71°C operation
ONE MIL-STD-1553B DUAL REDUNDANT BC/RT/MT (STANAG 3838 COMPLIANT) CHANNEL
Aitech’s S703 MIL-STD-1553B PMC features one BU61688 Mini-Advanced Communication Engine or a BU61582 SpaceACE hybrid by DDC. Each terminal provides dual transceiver and encoder/decoder, complete MIL-STD-1553B protocol, 16k 16-bit words of shared RAM, and memory management logic for all three modes (BC/RT/MT). Background Mode Operation prevents inadvertent access to the card during power-on-self-test. On-board Interrupt Mask and Interrupt Status Registers support flexible operation for both interrupt and polling applications.
The memory management scheme for RT mode provides an option for separation of broadcast data plus a circular buffer option for individual RT sub-addresses to off-load the demands on the PC host processor. The S703’s PCI interface provides bridging capabilities between the carrier board PCI bus and the local MIL-STD-1553B controller bus. The Bridge supports a 32-bit wide PCI bus clocked at 33.333 MHz. The PCI Local Bus is compliant to Rev. 2.1 specifications.
The S703 interface to the MIL-STD-1553B bus is either for transformer (long stub) or direct (short stub) coupling. Each S703 terminal/channel pair can be switched to use either transformer or direct coupling according to the factory installed configuration (transformer coupling by default). Both, transformer and direct-coupling configurations require the use of an isolation transformer located on the S703 PMC. For the (long stub) transformer-coupled configuration, a second transformer (referred to as a bus-coupling transformer) is required, in accordance with MIL-STD-1553B.
In addition, both coupling configurations require an isolation resistor to be placed in series with each leg of the transformer connecting to the MIL-STD-1553B bus. This design protects the bus against short circuit conditions in the transformers, stubs, or terminal components.
The four optional UART ports configured in baud rates from 9600 bps to 115.2 kbps and each port comes with independent transmit and receive buffers. All buffers are 64 bytes with tyCo VxWorks implementation.