OSU8 Schematics, Complete List

• Xilinx Implementation
  • Address Decoder
  • OSU8 Core, also a Larger Image
    • 8-bit ALU, All Data Operations
      • 8-bit Ripple Carry Adder
        • Single Bit Full Adder
      • 8-bit Shifter
        • 2-input MUX
        • 3-input MUX
        • 4-input MUX
      • 8-bit 3-input MUX
        • 3-input MUX
      • Function Decode Logic
      • N & Z Output
      • 8-bit AND
      • 8-bit OR
      • A Zero AND Gates
      • B Zero AND Gates
      • A Comp XOR Gates
      • B Comp XOR Gates
      • 2-input MUX (Carry out)
    • 16-bit ALU, Address Computations
      • Single Bit Full Adder
    • Control State Machine Logic (Schematic in 8 sheets)
      • Schematic Sheet #1, also a Larger Image
      • Schematic Sheet #2, also a Larger Image
      • Schematic Sheet #3, also a Larger Image
      • Schematic Sheet #4, also a Larger Image
      • Schematic Sheet #5, also a Larger Image
      • Schematic Sheet #6, also a Larger Image
      • Schematic Sheet #7, also a Larger Image
      • Schematic Sheet #8, also a Larger Image
    • Control State Machine State Register
    • Bus Controller
    • Accumulator Register
    • B Register
    • Status Bits
      • 2-input MUX
      • 8-input MUX
        • 2-input MUX
    • Current Operand Register
    • Program Counter
      • 2-input MUX
    • Stack Pointer
      • 2-input MUX
    • P1 Pointer
      • 2-input MUX
    • P2 Pointer
      • 2-input MUX
    • Equality Compare, 16 Bits
    • Temporary Register, 16 Bits
    • Tri-State Buffer, 8 Bits, ALU Output
    • Tri-State Buffer, 8 Bits, Data Input
    • Tri-State Buffer, 4 to 8 Bits, Operand to 8-Bit Bus
    • Tri-State Buffer, 8 Bits, 16-Bit Bus LSB to 8-Bit Bus
    • Tri-State Buffer, 8 Bits, 16-Bit Bus MSB to 8-Bit Bus
    • Tri-State Buffer, 16 Bits, 8-bit Bus to 16D Bus
    • Tri-State Buffer, 16 Bits, Program Counter to 16A Bus
    • Tri-State Buffer, 16 Bits, Program Counter to 16C (Address) Bus
    • Tri-State Buffer, 16 Bits, Stack Pointer to 16A Bus
    • Tri-State Buffer, 16 Bits, Stack Pointer to 16C (Address) Bus
    • Tri-State Buffer, 16 Bits, P1 Pointer to 16A Bus
    • Tri-State Buffer, 16 Bits, P1 Pointer to 16C (Address) Bus
    • Tri-State Buffer, 16 Bits, P2 Pointer to 16A Bus
    • Tri-State Buffer, 16 Bits, P2 Pointer to 16C (Address) Bus
    • Tri-State Buffer, 16 Bits, 16-Bit ALU to 16C (Address) Bus
    • Tri-State Buffer, 16 Bits, 16C (Address) Bus to 16D Bus
    • Pulldown, 8 Bits, Drives All Zeroes on 8-Bit Bus