SunChoices 
11  November 1988
1
           SunDragon Architecture Issues
                       
Ground Rules :

    Server from 100-400 MIPS
    160 MegaBytes/sec for IO
    FCS 1Q91
    
    
I. DynaBus versus MBus


2. Connection between processors


3. Processor selection

4. Evolution of the family

5. Cache selection SC versus CMT
Processor selection
    
·  Because  Maxiray Module  has  a  First level cache ,  it can be used only on a One bus system or
it needs a Second level cache as Connection Point.

· Because  Second level cache schedule is too long, we cannot use the Maxiray Module as it is for doing a high performance server 
(> 120 MIPS) for 1Q91

· So we have to use the Processor alone and the Connection Point has to be a First Level Cache
 
· Choices are :
    SunRay        390 Mips/24 procs
    MaxiRay Harvard    405 Mips/21 procs 
    MaxiRay non Harvard    
    
    These solutions suppose ECL or Low-level 
    CMOS on the processor interface
Evolution of the family

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