CPU contained LSI

Details CPU contained LSI CPU contained LSI

2007-09-04

2007-09-04

Auve, Glenn A. (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus interface architecture

C710S240000

Reexamination Certificate

active

10735630

ABSTRACT:
In a system in which a CPU contained LSI and an external CPU share a bus, when the external CPU accesses a device to be controlled which is connected to a bus, the access to a device mounted on the common bus is not prevented in the CPU contained LSI. A CPU contained LSI includes a CPUa, common address/data buses111and112connected to the CPUa, CPUb address/data buses211and212connected to a CPUb, and a bus adjusting circuit105disposed between the common address/data buses and the CPUb address/data buses to exclusively control accesses from the CPUa and the CPUb to a device connected to the common address/data buses and connect the CPUb adress/data buses to the common address/data buses only when the CPUb is permitted to access the device connected to the common address/data buses.

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