when deal with the D instruction, shall I determine if it's a jump first?

[woodylcy]

I think I must deal with the computing function and jumping function differently at first?

 Do I understand it correctly？ thanks for your help.
 

[cadet1620]

All of this happens as combinational logic:

• The ALU computes its value and sets its condition flags.
• Those condition flags combine with the jump condition control signals from the instruction decoder to create a jump control signal.
• The jump control signal changes the inc and load inputs to the PC to change what happens when the system clock fires at the end of the instruction cycle.

--Mark