GLD-VXI/B Curtiss-Wright MIL-STD-1553 Interface Module

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module provides a powerful and convenient interface between a host computer and a MIL-STD-1553 data bus. The GLD-VXI enables the host to simultaneously operate in real-time as a MIL-STD-1553A or B protocol Bus Controller (BC), Multiple Remote Terminal (MRT) and Chronological Monitor (CM). The GLD-VXI provides the host with complete access to data received or transmitted on the bus and the ability to detect bus errors.

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module utilizes a high-speed controller in conjunction with Dual-Port Random Access Memory (RAM) to provide a complete, intelligent emulation system. Using onboard data structures located in the Dual-Port RAM, the board is capable of sustaining operation on the bus without host intervention. In addition, the CM stores commands, status responses, gap times and time tags within the same buffer.

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module is manufactured as either single (1A and 1B bus) or dual (2A and 2B buses) channel configuration. The dual-channel configuration provides all of the functionality of two single GLD-VXI boards and twice the amount of onboard dual-port RAM. Each channel contains 64 K Words of dual-port RAM and may be mapped to one area of memory or two different areas of memory.

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module is capable of operating in BC, MRT and CM modes simultaneously or independently. All MIL-STD 1553A or B protocol communication between emulated devices occurs over the 1553 bus, rather than through a local bus. The three operating modes provide extensive bus protocol error detection, such as parity error and no response.

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module is equipped with an RS-422 port. This port provides a Discrete Output Signal (DOS) with a duration of 2 µs, which may be programmed to signal the start of any buslist instruction. The port also allows for input of an external elapsed timer (ELT) clock and reset signal, as well as a start trigger for the bus controller mode.

The Curtiss-Wright / Systran / Digital Technology GLD-VXI MIL-STD-1553 Interface Module has two on-board 32-bit elapsed timers. One timer is used for bus controller intermessage timing while the other tracks absolute simulation time for the chronological monitor. Each timer has 1 µs resolution.