Core1553BRT Mil-STD-1553B Remote Terminal

Core1553BRT provides a complete, dual-redundant MIL-STD-1553B remote terminal (RT) apart from the transceivers required to interface to the bus. A typical system implementation using the Core1553BRT At a high level, Core1553BRT simply provides a set of memory mapped sub-addresses that ‘receive data written to’ or ‘transmit data read from.’ The core can be configured to directly connect to synchronous or asynchronous memory devices. Alternately, the core can directly connect to the backend devices, removing the need for the memory buffers. If memory is used, the core requires 2,048 words of memory, which can be shared with the local CPU. The core supports all 1553B mode codes and allows the user to designate as illegal any mode code or any particular sub-address for both transmit and receive operations. The command legalization can be done within the core or in an external command legality block via the command legalization interface. The core consists of six main blocks: 1553B encoders, 1553B decoders, backend interface, command decoder, RT controller blocks and a command legalization block. In the Core 1553BRT, a single 1553B encoder is used. This takes each word to be transmitted and serializes it, after which the signal is Manchester encoded. The encoder also includes both logic to prevent the RT from transmitting for greater than the allowed period and loopback fail logic. The loopback logic monitors the received data and verifies that the core has correctly received every word that it transmits. The output of the encoder is gated with the bus enable signals to select which buses the RT should use to transmit.

• Supports MIL-STD 1553B
• 1 Mb/s Time-Multiplexed Serial Data Bus
• Interfaces to External RAM or Directly to Backend Device
• Synchronous or Asynchronous Backend Interface
• Selectable Clock Rate of 12, 16, 20, or 24 MHz
• Interfaces to Standard 1553B Transceivers
• Programmable Mode Code and Sub-Address Legality for Illegal Command Support
• Memory Address Mapping Allowing Emulation of Legacy Remote Terminals
• Fail Safe State Machines
• Fully Synchronous Operation