MA31750

The Dynex Semiconductor MA31750 is a single-chip microprocessor that implements the full MIL-STD-1750A instruction set architecture, or Option 2 of Draft MIL-STD- 1750B. The processor executes all mandatory instructions and many optional features are also included. Interrupts, fault handling, memory expansion, Console, timers A and B, and their related optional instructions are also supported in full accordance with MIL-STD-1750.

The MA31750 offers a considerable performance increase over the existing MAS281. This is achieved by using a 32-bit internal bus structure with a 24 x 24 bit multiplier and 32-bit ALU. Other performance-enhancing features include a 32-bit shift network, a multi-port register file and a dedicated address calculation unit.

The MA31750 has on-chip parity generation and checking to enhance system integrity. A comprehensive built-in self-test has also been incorporated, allowing processor functionality to be verified at any time. Console operation is supported through a parallel interface using command/data registers in l/O space. Several discrete output signals are produced to minimise external logic. Control signals are also provided to allow inclusion of the MA31750 into a multiprocessor or DMA system.

The processor can directly access 64KWords of memory in full accordance with MIL-STD-1750A. This increases to 1MWord when used with the optional MA31751 memory management unit (MMU). 1750B mode allows the system to be expanded to 8MWord with the MMU.