Peter W Heslin, 6428 Cleveland St, Boston, MA 02136
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Us Patents
On Chip Signal Selection Method And Apparatus
US Patent:
4799147, Jan 17, 1989
Filed:
Mar 26, 1987
Appl. No.:
7/031318
Inventors:
Peter M. Heslin - Natick MA
Assignee:
Honeywell Bull Inc. - Waltham MA
International Classification:
G06F 100
US Classification:
364200
Abstract:
A microprocessor integrated circuit chip includes a plurality of functional areas containing a large number of widely distributed signal sources. An on-chip selection network is distributed on the chip which enables the selection of signals from the large number of sources under microinstruction control without any decrease in chip performance. The network includes an access bus which is distributed to the functional areas as a function of the concentration of signals provided by the sources. Individual decoders are strategically located on the chip and connect in common to a control bus. Each decoder connects to a plurality of switches for linking the sources of a functional area to the access bus. A selector circuit terminates the access bus at one end. Under microprogram control, the selector circuit is enabled to select which final source signal is applied to the functional area containing branching circuits for selecting a next microinstruction to be executed by the microprocessor.
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