Method and apparatus for controlling timing of execution of savi

Details Method and apparatus for controlling timing of execution of savi Method and apparatus for controlling timing of execution of savi

1994-04-06

1997-06-24

Donaghue, Larry D.

395591, 395800, G06F 1516, G06F 938, G06F 1128

Patent

active

056424990

ABSTRACT:
In a coprocessor system having a central processing unit (CPU), a floating-point processing unit (FPU) and a memory (RAM), coupled with each other through buses, when the CPU issues a save command to the FPU, the FPU discriminates the attribute, i.e., a long command or a short command, of a current command executed by the FPU upon receipt of the save command and the internal status thereof. In response to the discrimination result, the FPU interrupts the execution of the current command at once to start the execution of the received save command, when the current command is a long command, and the FPU executes the received save command after the completion of execution of the current command, if the current command is a short command. The attribute of a command is determined in advance on the basis of a time necessary for executing the command and a predetermined criterion provided therefor.

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patent: 4715013 (1987-12-01), MacGregor
patent: 4750110 (1988-06-01), Mothersole et al.
patent: 4977497 (1990-12-01), Sakamura et al.
MC 68020 32-Bit Microprocessor User's Manual; 1985 Section 8.
MC 68881/MC 68882 User's Manual Section 8.
MC68881/MC68882, Floating-Point Coprocessor User's Manual 1987, Motorola; Section 1, Section 6.4, pp. 7-7; 3-7-3-12; 4-16-4-89.
Motorola, MC68881 Floating-Point CoProcessor User's Manual, 1985 pp. 1-6-1-9, 2-16-2-18 4-1-4-38.
"The MC68881 Floating-point Coprocessor" 1983, Huntsman et al.

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