Talk:DLX/Archives/2013
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first EX, then MEM?
First comes the EXecution unit, then the MEMory access unit. But how can the EX do math if it needs data that is fetched a step later by MEM? --Abdull (talk) 17:00, 11 June 2008 (UTC)
- The memory fetch stage comes after the execute stage becuase the memory address needs to be calculated first in order for the data to be fetched. This is my understanding anyways. Rilak (talk) 05:18, 12 June 2008 (UTC)
- The DLX uses a Load/Store architecture, which means that only "load" and "store" instructions can access the memory - all other instructions (ADD, MULT, etc) use registers. The EX stage can use data only from the registers, which are retreived in the ID phase. In order to use relative addressing, a number has to be added to an address, which requires the ALU. This manipulation is done in the EX phase, so logically the EX phase must precede the MEM phase. Inductiveload (talk) 14:46, 22 January 2009 (UTC)
- Yes. What I think is missing is reference to a related but separate concept in computer architecture: data hazards. It deals with some of these internal logic design issues within the generic processor architecture. Int21h (talk) 18:56, 27 January 2013 (UTC)