Excavating
Patent
1992-12-18
1994-11-15
Eng, David Y.
Excavating
3642655, 3649447, G06F 1134
Patent
active
053655265
ABSTRACT:
A trace system for selectively storing in tags stored in a TAG IN register and out tags stored in a TAG OUT register of an I/O channel controlled by an I/O channel controller, the trace system comprising a first means for generating a first signal whenever an in tag is changed in the TAG IN register, a second means for generating a second signal whenever out tags are written into the TAG OUT register, a storage means for storing the in tags and the out tags and a control means for storing, in response to a first or second signal, the in tags stored in the TAG IN register and the out tags stored in the TAG OUT register present when the first or second signal is generated. Means are further provided for allowing the storage means to be read by the I/O channel controller when an interface control check error is detected by the I/O channel in response to I/O channel interface malfunction. The trace system, upon the occurrence of an interface control check error, will store the tags presently stored in the TAG IN and TAG OUT registers and will mark those tags such that the system will be able to identify which tags were stored in the TAG IN and TAG OUT registers associated with the interface control check error.
REFERENCES:
patent: 4310895 (1982-01-01), Edstrom
patent: 5185862 (1993-02-01), Casper
patent: 5287363 (1994-02-01), Wolf
Amdahl Corporation
Eng David Y.
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