AT&T 3B2/300 Technical Reference Manual page 289

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - - -
MAIN CONTROLLER
I
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t t
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FETCH CONTROLLER
EXECUTE CONTROLLER
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WORKING
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REGISTERS
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32-BIT
INSTRUCTION
INSTRUCTION
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ADDRESS
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CONTROL
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DATA
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r4
r5
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r8
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FETCH UNIT
..................... ·l>!IC· ....
EXECUTE UNIT
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DATA, ADDRESS, AND
CONTROL BUSES
Figure 3-14: System Board CPU - Functional Block Diagram
3-36 TECHNICAL REFERENCE MANUAL