Input Bus

The 1605P interfaces data from eight possible Model 1602P PCM Frame Synchronizer cards, an IRIG port, a HOTLink® port, and an optional Model 482P Analog to Digital port mezzanine card. Each datum is distributed as two 32-bit words. The first word is the identifier - containing time, status, and an ID tag, and the second word is the data. The hardware supports up to 131,072 unique ID tags.

Distribution

The 1605P uses the ID tag value accompanying a datum to address a table in onboard memory that defines the processing, routing, and post-processing destination of each input datum.

Device Bus

Provides an interface to such devices as digital-to-analog outputs, digital discrete outputs, a local feedback to the Input Bus, serial HOTLink® output, and a PCIbus host DMA channel.

Host Interface

Provides controls for running the 1605P as well as outputting and receiving data from the Device Bus. The PCIbus host DMA channel provides a data path to and from host memory and devices.

Processing

An Analog Devices SHARC® DSP performs simultaneous multiplier and ALU operations in a single clock. The DSP is user-programmable with ADI software, which includes an optional C compiler.

Input Data

Six 16-bit input types are supported: 2’s Complement, 1’s Complement, sign magnitude, offset binary, unsigned magnitude, and binary-coded-decimal. Three 32-bit types are supported: signed integers, IEEE, & MIL-STD floating point.

Output Data

Five 16-bit output types are supported: 2’s complement, 1’s complement, sign magnitude, offset binary, and unsigned magnitude. Four 32-bit types are supported: signed & unsigned integers, IEEE & MIL-STD floating point.

Algorithms

Over 300 telemetry algorithms are provided, plus sequential algorithm chaining and user-defined expression processing. Algorithms include integer-to-floating point and floating point-to-integer conversion, limit and bit testing, data packing, linear data scaling, 5^th order conversion, table lookup conversion, derived parameter calculation, and custom output formatting.

Throughput

Algorithm execution times range from a few hundred nanoseconds to several microseconds, with a maximum throughput for processed data of approximately 2.6 megasamples per second.

Reconstructor

Operating as a data reconstructor or simulator, the 1605P accepts digital data from archival storage and reconstructs the original data stream, permitting the reprocessing and analysis of stored data. The Reconstructor may be set to output data at real-time, multiples, or fractions of the real-time rate.

Serializer

Accepts data from the PCIbus via DMA or selected data from the input real-time stream and performs serialization and output at a selectable bit rate. This capability allows real-time retransmission of selected subsets of the input data.