Data playback device based on FIFO (First In, First Out) caching structure

Abstract

The invention discloses a data playback device based on an FIFO (First In, First Out) caching structure and belongs to the technical field of analog output. The data playback device comprises a storage device, a control platform, a data buffering area FIFO and a digital analog converter, wherein the storage device is connected with the control platform through a bus BUS0; the control platform is connected with the data buffering area FIFO through a bus BUS1; the data buffering area FIFO is connected with the digital analog converter through a bus BUS2; a test data is stored in the storage device; the control platform is provided with an external input port and can read and output the test data according to a preset control flow; an input data bit width of the data buffering area FIFO is set as being more than an output data bit width; an active restriction for full-state identification in the FIFO is set; the digital analog converter is used for receiving the test data from the data buffering area, performing digital analog conversion on the test data and outputting an analog signal; and Bus0 rate* Bus0 valid bit width is more than or equal to Bus1 rate* Bus1 valid bit width which is more than Bus2 rate* Bus2 valid bit width. The data playback device is suitable for the playback of a large amount of test data.

Description

technical field [0001] The invention belongs to the technical field of analog output. Background technique [0002] In the current testing field, when testing a system, testers often use test data playback to simulate the signal environment in order to save testing costs. [0003] In order to make the analog signal environment more realistic, it is necessary to ensure the update rate of the analog output of the test data. Therefore, the traditional data playback device uses an independent memory to store the playback data samples, and outputs the data through a digital-to-analog converter. Most of the independent memories are The flash memory is faster than the hard disk, and the capacity of the independent memory is limited, so this analog output playback device can only be used for simple systems and situations where the amount of data samples is small. [0004] The current development trend of system complexity and data sample diversification has led to a sudden increase...

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Problems solved by technology

[0003] In order to make the analog signal environment more realistic, it is necessary to ensure the update rate of the analog output of the test data. Therefore, the traditional data playback device uses an independent memory to store the playback data samples, and outputs the data through a digital-to-analog converter. Most of the independent memories are Flash memory, faster than hard disk, and independent memory capacity is limited, so this kind of analog output playback device can only be used for simple systems and small data samples

[0004] The current development trend of complex systems and diversified data samples has led to a sudden increase in the number of test data samples, which exceeds the limit of independent memory capacity. Therefore, traditional data playback devices can no longer adapt to the current situation of huge test data samples.

[0005] Moreover, when simulating the signal environment, it is often necessary to continuously output sample data. The traditional data playback device directly outputs data to the data samples in the memory. Due to the limitation of the memory capacity, after a certain period of time after the data samples are output, the memory will If it is empty, testers need to write new data to the memory. Due to frequent manual operations, the high efficiency and automation of the current system test cannot be realized.

[0006] Therefore, the traditional data playback device can no longer meet the testing requirements of the current complex system

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