Java Virtual Machine (IJVM) Microarchitecture

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What is the function of the N register in the CPU?

To store a copy of the sign bit of the value generated by the ALU (correct)
To store the address of the next microinstruction
To control the memory read/write operations
To drive data from the ALU to the registers

What is the purpose of the MAR register?

To store the data to be written to memory
To store the address of the data to be read from memory (correct)
To control the ALU operations
To store the value generated by the ALU

What is the function of the C bus?

To control the memory read/write operations
To drive data from the registers to the ALU
To drive data from the B bus to the ALU
To drive data from the ALU to the registers (correct)

What is the purpose of the Microprogram Counter (MPC) register?

To store the address of the next microinstruction (A) Signup and view all the answers

How many control signals are used to control the ALU operations?

6 (A) Signup and view all the answers

What is the function of the SLL8 operation?

To shift the content left by 8 bits (C) Signup and view all the answers

What is the primary task of the microprogram in the microarchitecture?

To fetch, decode, and execute IJVM instructions (C) Signup and view all the answers

What is stored in the Working space (read-only memory)?

The compiled program (A) Signup and view all the answers

What is the purpose of the Memory Address Register (MAR)?

To hold the address of the memory location being accessed (B) Signup and view all the answers

What is the MicroProgram Counter (PC) used for?

To hold the address of the next microinstruction (A) Signup and view all the answers

What is the function of the Execution Unit in the computer system?

To execute the IJVM instructions (B) Signup and view all the answers

What is the purpose of the System Bus in the computer system?

To connect the CPU to the Main Memory (C) Signup and view all the answers

What is the condition for Addr to be either 0x00 or 0x100?

JMPC = 1 (D) Signup and view all the answers

What is the role of the MIR register?

It is used for synchronization at the beginning of the cycle (D) Signup and view all the answers

What is the result of the bitwise OR operation when JMPC is set?

The 8 MBR bits are bitwise ORed with the 8 low-order bits of the NEXT ADDRESS field (C) Signup and view all the answers

What is the purpose of the falling edge in the Mic-1?

To start a new cycle (B) Signup and view all the answers

What is the condition for the next microinstruction to come from 0x92?

Z bit is 0 (D) Signup and view all the answers

What is the number of potential successors of a microinstruction with JAMZ set to 1?

Two (D) Signup and view all the answers

What is the operation performed by the box with the label 'O'?

OR of MBR with NEXT ADDRESS (D) Signup and view all the answers

What is the maximum number of words in IJVM memory?

1,073,741,824 (B) Signup and view all the answers

What is stored in the method area of IJVM memory?

The program (B) Signup and view all the answers

What is the effect of the instruction PC = PC+1?

Fetch the next byte (A) Signup and view all the answers

What is the purpose of the CPP register?

Contains the address of the first word of the constant pool (C) Signup and view all the answers

What is the relationship between LV and the constant pool?

LV, LV + 1, and LV + 2 refer to the first three words of the constant pool (B) Signup and view all the answers

What is the purpose of the IRETURN instruction in the IJVM?

To deallocate space used by a returning method and restore the stack to its former state (C) Signup and view all the answers

What is the state of the stack after executing the IRETURN instruction?

The stack is in the same state as before the method call, except for the return value on top (A) Signup and view all the answers

What is MAL in the context of the IJVM instruction set?

A high-level Micro Assemble Language (D) Signup and view all the answers

What is the purpose of the MAR/MDR registers in the IJVM?

To read and write 4-byte data words (B) Signup and view all the answers

What is the effect of the fetch operation in the IJVM?

It reads a 1-byte opcode from the instruction stream (D) Signup and view all the answers

What is a characteristic of a microinstruction in the IJVM?

It must explicitly supply the address of the next instruction to be executed (C) Signup and view all the answers