Functional test method of I2S (Inter-IC Sound Bus) interface

Abstract

The invention provides a functional test method of an I2S (Inter-IC Sound Bus) interface, which comprises the following steps that: the I2S interface of an SOC (system on chip) to be tested is correspondingly connected with three pins of external CODEC (coder / decoder) equipment, then the SOC to be tested and the external CODEC equipment are correspondingly connected by pins on respective I2C (Inter-IC bus) interfaces, and finally, I2S_SDO (serial data output) and I2S_SDI (serial data input) pins on the I2S interfaces are directly short-circuited; the I2S interface of the SOC to be tested is set into a slave mode, the external CODEC equipment is set into a master mode by the I2C interface of the external CODEC equipment, and the corresponding working frequency and sampling rate are set; the related initialization is carried out: test data are prepared, and the I2S interface of the SOC to be tested is started up to send the data; and the I2S interface of the SOC to be tested receives the data: the corresponding data of a receiving buffer are read to the corresponding memory, and the final test result is obtained by comparing the received data with the sent data. In the invention, the functional test and validation are conducted by stimulating the practical application of the I2S interface, so that the test range is wider.

Description

【Technical field】 [0001] The invention relates to the field of SOC function testing, in particular to a method for testing the function of an I2S controller and a method for testing whether a pin binding process of a corresponding interface is qualified. 【Background technique】 [0002] IIS (InterIC Sound Bus, usually represented by I2S, hereinafter referred to as I2S) is a bus interface developed by Philips for audio data transmission between digital audio devices. In the I2S standard of Philips, the format of digital audio data is also specified. I2S has the following 3 main signals: [0003] 1. Serial clock SCLK signal: also called bit clock (BCLK), that is, corresponding to each bit of digital audio data, SCLK has 1 pulse. SCLK frequency = 2 × sampling frequency × sampling number of bits; [0004] 2. Frame clock LRCK signal: (also known as WS), used to switch the data of the left and right channels, LRCK is "1" means that the data of the left channel is being transmitt...

AI Technical Summary

Problems solved by technology

[0007] As far as the current SOC (system-on-chip) function test field tests the I2S interface, most of them still stay in the simple pin packaging and process testing, which is not comprehensive enough for more complex SOCs that contain I2S interfaces in large quantities. At the same time, it cannot make up for the possibility of problems left over from the CP (chip prober refers to testing the wafer before packaging) test

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