Technical Progress for IDDGA -OBP Upgrade. Revision

Abstract

The chip functionality has been defined by Martin Marietta. It was previously noted that the FA adjust control and the RND control may both be activated at the same time. When this occurs, both the Martin Marietta simulator (SIMCPU) and the Analytyx instruction set simulator (CPUSIM) produce results not consistent with the IDT device. It was determined that this mode is not useful for current OBP software. Martin Marietta recommends that the OBP Programmers Reference manual specify that the multiplier output be indeterminate when this combination of controls is applied to the device. The run closing data for the Arithmetic Logic Unit is 9/30/90. Since this date is rapidly approaching, discussions were held regarding its design at the June TIM at Analytyx. The ALU is actually a twin ALU. Two 16 bit 49C402 ALU's are incorporated into a single device. These ALU's are independent of each other. Since the current OBP architecture does not support two complete ALU's, it is necessary to decode the microword.

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Document Details

Document Type
Technical Report
Publication Date
Jun 26, 1990
Accession Number
ADA224618

Entities

People

  • S. Espy

Organizations

  • Martin Marietta

Tags

DTIC Thesaurus Topics

  • Arithmetic
  • Computing System Architectures
  • Contracts
  • Decoding
  • Demographic Cohorts
  • Instruction Set Architecture
  • Instructions
  • Microarchitecture
  • Multithreading
  • Side Effects
  • Simulators
  • Space Systems

Readers

  • Integrated Circuit Design and Technology.
  • Marine Propulsion Engineering and Naval Architecture
  • Software Engineering