SLASEG6B May 2018 – June 2020 TAS3251
The Xor checksum is a simpler checksum scheme. It performs sequential XOR of each register byte write with the previous 8-bit checksum register value. XOR supports only YMEM, which is located in Book 0x8C and excludes page switching and all registers in Page 0x00 of Book 0x8C. XOR checksum is read from location register 0x7D on page 0x00 of book 0x8C (B140_Page 0_Reg 125). The XOR Checksum can be reset by writing 0x00 00 00 00 to the same register location where it is read.