Backup method and device for soc chip crystal oscillator circuit

Abstract

The invention provides a method for backing up the crystal oscillator circuit of an SOC chip. A first crystal oscillator circuit and a second crystal oscillator circuit are arranged on the chip bare chip, and a test circuit is arranged on the chip bare chip and the chip packaging substrate; In the chip test stage, the first crystal oscillator circuit and the second crystal oscillator circuit are respectively tested for the crystal oscillator circuit by the test circuit, and the test results divide the chip die into the first crystal oscillator circuit and the second crystal oscillator circuit, both of which can work, and only the second crystal oscillator circuit can work. The crystal oscillator circuit can work, the first crystal oscillator circuit and the second crystal oscillator circuit cannot work, and then deal with the three types of bare chips accordingly. The present invention uses the new crystal oscillator circuit when the new crystal oscillator circuit can work normally, and can conveniently use the mature crystal oscillator circuit directly through package modification when the new crystal oscillator circuit cannot work normally, thus solving the problem of high performance of the new circuit at the same time , and can avoid the risk of designing new circuits.

Description

【Technical field】 [0001] The invention relates to the design and packaging of an SOC chip, in particular to a backup method and device for a crystal oscillator circuit of the SOC chip. 【Background technique】 [0002] The clock is the heart of a digital chip, and the crystal oscillator is the source of the entire chip clock, which determines the clock quality of the entire chip. It is the trend of the chip to use a higher-quality crystal oscillator circuit under a new process. But at the same time, due to the huge Once the crystal oscillator fails to work or works unstable, the entire chip will not work and be mass-produced. In order to balance the high-quality crystal oscillator circuit designed by the new process and the huge risk that the newly designed crystal oscillator circuit brings to the entire chip, The present invention proposes a design method for simultaneously using a new crystal oscillator circuit and a mature crystal oscillator circuit. When the new circuit ca...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a backup method and device for a SOC chip crystal oscillator circuit. When the new crystal oscillator circuit can work normally, the new crystal oscillator circuit can be used, and when the new crystal oscillator circuit cannot work normally, it can be easily modified through packaging. Directly use the mature crystal oscillator circuit, which solves the problem of not only wanting the high performance of the new circuit, but also avoiding the risk of designing the new circuit

Images