关键词: 全数字锁相环, I2C接口, Verilog HDL

Abstract: An I²C interface module has been designed based on the 40 nm CMOS process. The module is used in the test and application scenarios of an all-digital phase-locked loop (ADPLL), and can output or write control words to the phase-locked loop. The interface is divided into system modules according to the functional requirements of the ADPLL, and the corresponding timing control module is designed according to the characteristics of the ADPLL to realize the functions of reading and writing the control word data. The behavioral-level description of the system is completed by Verilog HDL, and the use of scripts to automate the design allows for significant design time savings and easy integration into the system. The actual test results show that the I²C interface module can write control words to the corresponding control side of the ADPLL, communicate with the external microcontroller according to the I²C serial bus protocol, and realize the control and monitoring functions of the ADPLL at the same time to meet the test and application requirements.

Key words: all-digital phase-locked loop, I^{2C interface,} Verilog HDL