Sorry for delayed response for this.
The document "B4860 Reference Manual" should be public, but not available for download from B4860 Product Page for unknown reason.
Please enter a ticket to Online Technical Support team to get this document.
To enter a case to Online Technical Support please perform the following:
1. Please open www.nxp.com
2. Click "SUPPORT" drop-down menu
3. Click "All support options" in "SUPPORT" drop-down menu
4. Enter your NXP site login/password if necessary.
5. Click "Go to Tickets" in "Support Requests" section
6. The system should redirect you to this page https://nxpcommunity.force.com/community/CommunityContextPage
7. At this page please create a new folder for support cases by clicking "Add a Folder". Typically - one folder per project.
8. When asked, enter project details - design stage, projected annual volume, end application type and application name.
9. When folder is created, please click "Add a new case" button near to folder name to create support case.
