Apparatus and method for controlling secure communications between peripheral components on computer buses connected by a bridge circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 29, 2002
Grant Date -
N/A
app pub date -
Jan 12, 2000
filing date -
Jan 12, 2000
priority date (Note) -
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Abstract
An apparatus for and a method of controlling secure communication between peripheral components in a communication system. The security level of each peripheral component address in the communication system is fixed. When a message is communicated, a bus access arbiter (122) detects the address of the originating peripheral component, and an address detector (110, 114) detects the address of the destination peripheral component. An address comparison circuit (116) determines whether the address of the destination peripheral component is an address to which the originating peripheral component is permitted to communicate. The address comparison circuit (116) is responsive to the address of the destination peripheral component being an address to which the originating peripheral component is permitted to communicate by permitting communication of messages from the originating peripheral component. The address comparison circuit (116) is further responsive to the address of the destination peripheral component not being an address to the which the originating peripheral component is permitted to communicate by generating an error signal, preventing communication of further messages from the originating peripheral component.
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