Question

Write the instruction memory for the given code.

The loop starting address is placed at location 1 in the instruction memory. Use the following mapping for the compiler registers. \$s6 corresponds to R3 register, $ s5 corresponds to R2 register, $ s3 corresponds to R1 register, $ t 0 corresponds to R6 register and $t1 corresponds to R7 register. The registers in the register file ("register file.vhd") should have the following initial values. Initialize all other registers to 0 .
a) R1=0
b) R2=7
c) R3=1
d) R4=1

Answer 1

The question involves initializing instruction memory and registers within a simulated VHDL processor, requiring mapping of compiler register names to simulation registers and setting their initial values.

Step-by-step explanation:

The question pertains to the initialization of instruction memory and the setting up of initial values for registers in a simulated processor described by VHDL (VHSIC Hardware Description Language). The given code requires the representation of instructions within the instruction memory for a loop construct, with the mapping of compiler register names to those of the simulation registers. As specified, R1 should be initialized to 0, R2 to 7, R3 to 1, and R4 to 1, with all other registers starting at 0.

Without the specific code implementation for the loop or its context, it is impossible to write the exact instruction memory layout. However, typically, this would involve setting up the initial PC (program counter) to point to address 1 for the loop start, and using the indicated register file values, algorithms would be applied for instructions like load, store, add, subtract, branch if equal, and others relevant to the loop operation.