Electrical computers and digital processing systems: processing – Processing architecture – Microprocessor or multichip or multimodule processor having...
Patent
1996-04-15
1999-10-12
Eng, David Y.
Electrical computers and digital processing systems: processing
Processing architecture
Microprocessor or multichip or multimodule processor having...
G06F 922
Patent
active
059648635
ABSTRACT:
The present invention relates in general to a data processing system (10), and more particularly to a method and apparatus for providing instruction pipe (106) status information, including fullness information, external to data processing system (10). In one embodiment, an IPIPE2 integrated circuit terminal (15) is used to serially provide a pipe depth value indicating the fullness of the instruction pipe (106). The serial protocol used with the IPIPE2 (15) terminal includes a start bit, a fetch pointer value, and a plurality of idle bits. In one embodiment, IPIPE0 (13) and IPIPE1 (14) integrated circuit terminals may indicate loading and unloading of instruction pipe (106) and may stop toggling when central processing unit (102) is in a loop mode.
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Liu Chien-Yin
Livingston Kirk S.
Eng David Y.
Motorola Inc.
Witek Keith E.
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