GENERAL DESCRIPTION

The Am9512 is a high performance floating-point processor unit

(FPU). It provides single precision (32-bit) and double precision

(64-bit) add, subtract, multiply and divide operations. It can be

easily interfaced to enhance the computational capabilities of

the host microprocessor.

The operand, result, status and command information transfers

take place over an 8-bit bidirectional data bus. Operands are

pushed onto an internal stack by the host processor and a command is issued to perform an operation on the data stack. The

results of this operation are available to the host processor by

popping the stack.

Information transfers between the Am9512 and the host processor can be handled by using programmed I/O or direct memory

access techniques. After completing an operation, the Am9512

activates an end of execution signal that can be used to interrupt the host processor.