Do this in logisim 1. We have a CPU that has a 6-bit address bus. We need to use the address lines to generate device activate (chip select) signals for the various devices attached to the CPU.

Here are the active addresses ranges that are used to talk to the different devices:

Device Address Range Signal Name

RAM $00 to $1F CS_RAM

ROM $20 to $2F CS_ROM

Status Indicator $30 CS_LED

Comm. Port $32 to $33 CS_COM

Display $38 to $3F CS_LCD

a. Generate the full and complete truth table for the CPU and the address bus remember to write the table in descending address bit order and in binary counting order .

b. Write the Boolean expressions (by looking at your truth table) for the various chip select signals.

c. Using LogiSIM, layout and create the discrete logic circuit for the various signals please show all input and all output signals on one circuit. please ensure that you are using only the basic AND, OR and/or NOT 2-input gates in your circuitry.