MPU-6050 library &datasheet problems

I am really a newbie about this sensor.
I use the library MPU6050 written by Jeff Rowberg, the header file defines the registers' address from 0x00 to 0x75, but the datasheet shows the address not continuously from 0x00 to 0x75, for example I want to know how does the function setXGyroOffset() work, and it says the register RA_YG_OFFS_USRH 's address is 0x15,but I cant find this register from the datasheet.

Second problem is the packetSize = mpu.dmpGetFIFOPacketSize() from the example of MPU6050_DMP6,
it says the default is 42bytes,but I cant find any information from the datasheet about the packetsize,could any one explain this?

Really appreciate .

Hi,MarkT

You mean the support link?