Can you provide a better picture of 12 bit DAC to 8 bit data bus or explain the address decoding?

[shivajikobardan]

https://imgur.com/a/QQ6fAn2

I am confused with what is written in the figure

 

[Harald Kapp]

More detail, please.

• Where's the image from?
• Which DAC is this?
• What exactly do you not understand?