Select signals for memory mapped into common address space
Let's call the memory address $x$. Thus $x$ is composed of bits $x_0,\ldots,x_{31}$, where $x_0$ is the LSB and $x_{31}$ is the MSB.
A memory address belongs to the EEPROM mapped area if it is in the range $0,\ldots,2^{20}-1$. You can check that this is equivalent to the condition $x_{20} = \cdots = x_{31} = 0$, which you can translate into a Boolean expression for &quot;EEPROM Select&quot;.
The other signals can be handled similarly.