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| Low-latency real-time dispatching in general purpose multiprocessor systems |
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| dbX: a persistent programming language model |
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Method and apparatus for resetting, enabling and freezing a communication device in a diagnostic process
| Details |
Inventors: Simmons, Philip; Kerstein, Denise; Runaldue, Thomas J.; Egbert, Chandan; Erimli, Bahadir;
Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA)
Primary Examiner: Beausoleil; Robert
Assistant Examiner: Baderman; Scott T.
Attorney, Agent or Firm:
A resetting, enabling and freezing system is provided for controlling a communication device in a diagnostic process. A hardware reset of the device may be performed by a host via a reset pin of a PCI interface. A software reset of the device may be provided by setting a reset bit in a command register. To stop operations of the device substantially instantaneously, a freeze mode of diagnostics is provided. The freeze mode may be initiated using hardware or software freezing. To provide the hardware freezing, diagnostic logic is supplied with a freeze signal via a freeze pin of the PCI interface. The software freezing is performed by setting a freeze bit in the command register. To enable a diagnostician to reproduce an event causing an error, an enable/disable mode of diagnostics is carried out. In this mode, elements of the device are disabled one after another in a serial fashion, with a disable signal being passed serially from one element to another. After the elements are disabled, they may be set into a chosen state to recreate a required event. |
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DETAILED DESCRIPTION What is claimed is: 1.
A communication system, comprising: a host interface for providing a host with access to internal elements of said communication system, and diagnostic circuitry for stopping said internal elements immediately in response to a freeze signal from said host, and for stopping said internal elements serially so as to cause each of the internal elements to stop after completing currently performed operations, in response to a disable signal from said host.
2.
The system of claim 1, wherein said host is enabled to set said internal elements into a chosen state after said internal elements are stopped in response to said disable signal.
3.
The system of claim 2, wherein said host produces an enable signal for restarting said internal elements from said chosen state without resetting said internal elements to an initial state.
4.
The system of claim 3, wherein said internal elements are reset to said initial state to restart said system after supplying said freeze signal.
5.
The system of claim 1, wherein said host is enabled to monitor an internal state of said internal elements after said internal elements are stopped in response to said disable signal.
6.
The system of claim 5, wherein said disable signal is produced by setting an enable bit in a command register into a first logic state.
7.
The system of claim 6, wherein an enable signal is produced by setting said enable bit in said command register into a second logic state.
8.
The system of claim 7, wherein said freeze signal is produced by setting a freeze bit in said command register into a predetermined logic state.
9.
The system of claim 7, wherein said freeze signal is transferred via said host interface.
10.
The system of claim 5, wherein said internal elements pass said disable signal serially from one to another in a sequence preset so as to enable said internal elements to complete current operations.
11.
The system of claim 10, wherein said internal elements include a transmission register for storing data currently transmitted by said communication system
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