Assign#2: PC Datapath

Eugene K Cheung (eugkc@hotmail.com) Thu, 02 Nov 2000 19:10:59 PST 

From: "Eugene K Cheung" <eugkc@hotmail.com>
Subject: Assign#2: PC Datapath
Date: Thu, 02 Nov 2000 19:10:59 PST



Hello,

In the PC Datapath section of the CPU description, the specification states 
that the program counter, as a multiplexed option, can be loaded with its 
current PC register value.  However, there is no (opcode) instruction 
requiring the PC register to directly load its own value.  Consequently, why 
is this option necessary?

If I understand it correctly, all opcodes with exception of the 2 jump 
commands will simply load the PC with the next instruction (ie: PC+1) on the 
next clock cycle.

Thanks for the input.

Eugene
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