30.09.2016. - First successfull test of ALU addition
08.10.2016. - Added Control Unit , ALU completely working
13.10.2016. - Added Ram and more commands to Control Unit
19.10.2016. - Added Registers ( Only internal)
27.10.2016. - Added Program Counter
03.11.2016. - Added CPU.vhd and finished first successfull CPU test
17.11.2016. - Added USB Controller
alu_input_1 - first ALU input ( 8 bit)
alu_input_2 - second ALU input ( 8 bit)
alu_output - output signal of ALU ( 8 bit)
busy - one bit signal that tells us if ALU is busy or not
clk - clock input
command - command that we get from RAM ( 8 bit)
alu_command - command that will be parsed to ALU ( 8 bit)
ram_command - command that will be parsed to RAM ( 1 bit)
clk - clock input for Control Unit (will be connected to ALU clock)
clk - clock input
ram_data_in - input data (8 bit)
ram_data_out - output data ( 8 bit)
ram_address - address in RAM that we want write or read from ( 8 bit)
ram_command - tells RAM that we want to read 0 or write 1 ( 1 bit)
clk - clock input
register_input - input data ( 8 bit)
register_data - internal register data ( 8 bit)
register_output - register output ( 8 bit)
command - for wtiting or reading (1 bit)
clk - clock input
pc_input - Program Counter input (for loading value) ( 8 bit)
pc_output - output value ( 8 bit)
pc_internal_state - internal value ( 8 bit)
pc_command - Program Counter command ( 4 bit)
clk - clock input
rx - Byte that CPU will receive (8 bit)
tx - Byte that CPU will output (8 bit)
data - Received data or data that CPU will send (8 bit)
USB_command - 4 bit command that tells CPU to send or to receive data (4 bit)