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You are here: OSU8 Microprocessor Schematic OSU8 Core 8-Bit Data ALU 8-Bit Adder

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OSU8 Microprocessor Overview CPU Programming Hardware Info Schematic Xilinx Implementation Address Decoder OSU8 Core Normal Size Large Size 8-Bit Data ALU ALU-8 Main 8-Bit Adder 8-Bit Shifter 8-Bit 3:1 Mux Function Dec N & Z Bits 8-Bit AND 8-Bit OR Zero A Zero B Compare A Compare B Misc Logic 16-Bit Addr ALU Control State Machine State Register Bus Control Accumulator B Register Status Bits Operand Register Program Counter Stack Pointer P1 Pointer P2 Pointer 16-Bit Equals Temp Register 8-Bit Zero Buffers Full Hierarchy Index Implementation Download Files

8 Bit Adder

This ripple cary adder, and the similar ripple carry adder in the 16 bit ALU are the slowest portion of OSU8's circuitry. For Xilinx, this should probably use the fast-carry logic within the Xilinx CLBs, or custom CMOS this should probably be a Manchester carry or carry-lookahead type adder.

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Complete List of All OSU8 Schematics