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cp1_lect_8 - Processing Unit Functional Units ALU =...

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5/10/10 Processing Unit Functional Units ALU = Arithmetic and Logic Unit could have many functional units. some of them special-purpose (multiply, square root, …) LC-3 performs ADD, AND, NOT Registers Small, temporary storage Operands and results of functional units LC-3 has eight registers (R0, …, R7), each 16 bits wide Word Size number of bits normally processed by ALU in one instruction also width of registers LC-3 is 16 bits P R O C E S S I N G U N I T A L U T E M P
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5/10/10 Control Unit Instruction Register (IR) contains the current instruction . Program Counter (PC) contains the address of the next instruction to be executed. Control unit : reads an instruction from memory the instruction’s address is in the PC interprets the instruction, generating signals that tell the other components what to do an instruction may take many machine cycles to complete C O N T R O L U N I T I R P C
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5/10/10 Input and Output
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