On an AD9915, bit 15:8 of CFR4 reads 0x21 after reset. But the Rev A DS states: "Requires register default value settings (0x31)" on page 36.
Which one is correct? Or should the bits read 0x21, but require 0x31 on writes?
If you issue a master reset and the value in this register reads back 0x21 then 0x21 is correct default value.
So, 0x31 is a typo.Thanks for catching this.