We are trying to enable the test pattern output on both channels with 16 bit output resolution. A custom pattern 0xaa and 0xbb is written in registers 0x14 and 0x15 and to enable test pattern 0x6C is written to the register 0x16.The output we recieve is totally different from the values written in registers 0x14 and 0x15. Please explain the correct way to configure test pattern.