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Sampling a device bus

A bus and device technology, applied in the field of analyzing the signal between the host and the device, it can solve problems such as cost change, the analyzer cannot distinguish between low and high signals, and the problem is complicated.

Active Publication Date: 2009-03-11
FINISAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cost can become a big problem when analyzing CE-ATA due to repeated connection and disconnection of the protocol analyzer
Also, many consumer devices do not operate at the same voltage level
This complicates the problem of connecting the system to a protocol analyzer when the voltage level is not known in advance, since the analyzer cannot distinguish between low and high signals
Also, there are issues related to impedance matching and capacitive loading when the bus is electronic rather than optical

Method used

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Examples

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Embodiment Construction

[0014] Embodiments of the present invention overcome the limitations of conventional systems and relate to systems and methods for performing protocol analysis. In particular, embodiments of the invention relate to systems and methods for preparing data on a bus for analysis by a protocol analyzer, and include sampling methods. Generally speaking, data on the bus is sampled at regular intervals. The time interval at which the bus is sampled may be based on the expected frequency of the bus, or may be based on a sampling clock or based on other conditions. Typically, the sampling rate is at least twice the rate of the bus.

[0015] Therefore, the tapping unit taps the bus, and then the switching unit can sample the signal provided by the tapping unit to generate sampled data. Because the pod knows what tap is attached and what protocol is in effect on the system under test, the pod can decode the sampled data into bytes, words, commands, etc. according to the protocol. The d...

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Abstract

A method for preparing tapped data for analysis. The data on a bus is sampled and latched at a certain rate to produce raw data. The raw data is then decoded by a pod that is configured for the protocol of the bus in a system under test. The decoded data can then be presented to a protocol analyzer for analysis. The decoded data and the corresponding raw data may also be aligned and then presented to an analyzer for protocol analysis.

Description

technical field [0001] The invention relates to the analysis of signals between a host and a device by tapping the bus. In particular, embodiments of the invention relate to sampling a bus in preparation for analyzing data on the bus. Background technique [0002] A protocol analyzer is a device that helps diagnose and detect problems occurring on a network. Typically, protocol analyzers look at traffic on a network or on a bus as it occurs. Protocol analyzers can detect problems or certain defined conditions while data is being monitored. At this point, the analyzer triggers and captures the data present on the network or bus. The amount of data captured may depend on the size of the analyzer's buffer. The analyzer can also be configured such that the captured data is representative of data that occurred before the trigger event, after the trigger event, and / or both before and after the trigger event. Additionally, data can be captured without triggering an event. Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3177G01R31/316
CPCG06F11/221
Inventor 埃里克·J·兰宁
Owner FINISAR
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