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Logic how are functional units constructed ripple

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Unformatted text preview: • Logic : how are functional units constructed – Ripple carry, carry lookahead, carry select adders • Circuit : how are transistors used – Complementary CMOS, pass transistors, domino • Phys ical : chip layout – Datapaths, memories, random logic These elements are interdependent (i.e. choices of microarchitecture and logic depend on area) 8 Y-Diagram Physical Design • Hierarchy : Divide and Conquer – Recursively system into modules • Regularity – Reuse modules wherever possible – Ex: Standard cell library • Modularity : well-formed interfaces – Allows modules to be treated as black boxes • Locality – Physical and temporal datapath controller alucontrol ph1 ph2 reset memdata[7:0] writedata[7:0] adr[7:0] memread memwrite op[5:0] zero pcen regwrite irwrite[3:0] memtoreg iord pcsource[1:0] alusrcb[1:0] alusrca aluop[1:0] regdst funct[5:0] alucontrol[2:0] Example: 8-bit processor PC M u x 1 Registers Write register Write data Read data 1 Read data 2 Read register 1 Read register 2 Instruction [15: 1 ] M u x 1 M u x 1 1 Instruction [7: 0] Instruction [25: 21] Instruction [20: 16] Instruction [15 : 0] Instruction register ALU control ALU result ALU Zero Memory data register A B IorD MemRead MemWrite MemtoReg PCWriteCond PCWrite IRWrite[3:0] ALUOp ALUSrcB ALUSrcA...
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  • Fall '09
  • Guan
  • Central processing unit, Processor register, Standard cell, I/O pads, wiring tracks

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