CMG1 is Cypress's USB PD Controller chip dedicated for Type C EMCA passive Thunderbolt cable application.
Please refer the following link for accessing the datasheet of CMG1
Please refer the following KBA to get started with CMG1 for your specific application.
Please refer the following link to download EZ-PD Configuration Utility to configure vendor and cable specific configuration data
The steps to configure CMG1 for your specific application is explained in the above mentioned KBA.