Status reporting
First Claim
1. A status reporting apparatus comprising,an addressable unit,a first register having a plurality of stages for receiving status signals to be reported from said addressable unit,a second register having a plurality of stages,a first OR circuit receiving status signals from said first register and supplying a status group signal to one stage of said second register having a position within said second register indicating address of said addressable unit.
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Accused Products
Abstract
In a plural unit system, particularly of the data processing type, controlled units such as tape drives, constitute status reporting units (SRUs) which report status including error conditions to one or more status analyzing units such as computers (CPUs), programmable controllers, and the like. Each of the SRUs has a register, such as a shift register, associated therewith for receiving error status indications. The signal state of the shift register when all zeros indicates error-free status, any nonzero state signifies an error. An OR circuit receives signals from all of the bit positions of each of the respective shift registers and combines same into an SRU group error indicating signal. A second register, also a shift register, associated with the respective SRUs receives the output of the OR circuit in one of its bit positions, the bit position indicating the address of the reporting SRU. The output of the two shift registers associated with each of the SRUs are serialized onto one wire and supplied to an intermediate shift register. Combined signal status in the intermediate shift register are then supplied to one or more status analyzing units in a two byte format, i.e., one byte for the address and a second byte for the error status. An appropriate status analyzing unit then determines the error condition of the SRU. If more than one SRU is in error, then the address byte will have more than one binary one indicating state requiring further analysis by the respective status analyzing units.
31 Citations
17 Claims
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1. A status reporting apparatus comprising,
an addressable unit, a first register having a plurality of stages for receiving status signals to be reported from said addressable unit, a second register having a plurality of stages, a first OR circuit receiving status signals from said first register and supplying a status group signal to one stage of said second register having a position within said second register indicating address of said addressable unit.
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11. A data processing status reporting system for reporting status to a controlling unit from one of a plurality of status reporting units SRU comprising,
an attachment unit electrically interposed between said controlling unit and each of said SRUs and having a shift register for receiving status signals, and means for transferring said received status signals to said controlling unit from said shift register, each of said SRUs including at least a first register for containing error status signals indicating error status in the respective SRUs, Or circuits each connected to predetermined stages of each of said first registers for indicating error status in a respective one of said SRUs, and means connecting said OR circuits to said controlling unit for indicating detected error status in one of said SRUs, and a single line connection between all of said registers and said attachment unit shift register for receiving status signals simultaneously from all of said registers through said single shift register in said attachment unit.
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15. A status reporting system for a plural unit system, including in combination:
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a plurality of status reporting units (SRU), each said SRU having a status shift register and an address shift register, circuit means responsive to said status register having a predetermined signal content to set said address register to a predetermined address indicating said SRU, a status accumulating shift register (SASR) for receiving status signals and having a common input, a status connection shift register (CSR), an alert line connected to said SRU status shift registers for receiving a predetermined logic sum of signal contents therefrom for indicating that status is to be reported, shift means connecting said SRU status shift register to said common input, said SASR to said CSR, whereby signal contents of all said shift registers are shiftable through said CSR, and utilization means connected to said CSR for receiving signals therefrom. - View Dependent Claims (16, 17)
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Specification