Question

3. [25 pts. total] Given the following VHDL description snippet for pre-loading the VBC-1 instruction memory, mem. type mem_type is array(0 to 15) of std_logic_vector(7 downto 0); signal mem: mem_type := ( X"a0", X"10", X"77", X"08", X"80", X"c0", X"f0", X"00", X"00", X"00", X"00", X"00", X"00", X"00", X"00", X"00"); a. Decode the assembly language program implied by the memory values [9 pts], and the register transfer outcomes [7 pts.] for the program statements. Label | Assembly Language Code | Register Transfer Instructions in assembly language form (ALF) | Brief description of the instructions IN DR | Input the 4 slide switch values (data input) into DR OUT DR | Output the contents of DR to output port (OP) to four LEDs MOV DR,SR | Move the contents of SR into DR LOADI DR,Data | Load immediate Data into DR ADDI DR,Data | Add immediate Data to the contents of DR, and place the result in DR ADD DR,SR | Add the contents of SR to the contents of DR, and place the result in DR SR0 DR,SR | Shift the contents of SR to the right 1 bit with 0 fill of the MSB, then place the result into DR JNZ DR,Address | Jump if the contents of DR is not 0 to Address, else execute the next instruction Instructions | OPCODE bit assignments MOV | 000 LOADI | 001 ADD | 010 ADDI | 011 SR0 | 100 IN | 101 OUT | 110 JNZ | 111 d. Test the given program using Input="0110". Show the final status of the registers (including the instruction memory) by running the program to the last non-zero instruction. [9 pts.] RO RI PC IR Instruction memory (16 x 8) Output 0100 4 LEDs Input 0101 4 switches

          3. [25 pts. total] Given the following VHDL description snippet for pre-loading the VBC-1 instruction memory, mem.

type mem_type is array(0 to 15) of
std_logic_vector(7 downto 0);

signal mem: mem_type := (
X"a0", X"10", X"77", X"08",
X"80", X"c0", X"f0", X"00",
X"00", X"00", X"00", X"00",
X"00", X"00", X"00", X"00");

a. Decode the assembly language program implied by the memory values [9 pts], and the register transfer outcomes [7 pts.] for the program statements.

Label | Assembly Language Code | Register Transfer

Instructions in assembly language form (ALF) | Brief description of the instructions
IN DR | Input the 4 slide switch values (data input) into DR
OUT DR | Output the contents of DR to output port (OP) to four LEDs
MOV DR,SR | Move the contents of SR into DR
LOADI DR,Data | Load immediate Data into DR
ADDI DR,Data | Add immediate Data to the contents of DR, and place the result in DR
ADD DR,SR | Add the contents of SR to the contents of DR, and place the result in DR
SR0 DR,SR | Shift the contents of SR to the right 1 bit with 0 fill of the MSB, then place the result into DR
JNZ DR,Address | Jump if the contents of DR is not 0 to Address, else execute the next instruction

Instructions | OPCODE bit assignments
MOV | 000
LOADI | 001
ADD | 010
ADDI | 011
SR0 | 100
IN | 101
OUT | 110
JNZ | 111

d. Test the given program using Input="0110". Show the final status of the registers (including the instruction memory) by running the program to the last non-zero instruction. [9 pts.]

RO
RI
PC
IR
Instruction memory (16 x 8)
Output 0100 4 LEDs
Input 0101 4 switches

3. [25 pts. total] Given the following VHDL description snippet for pre-loading the VBC-1 instruction memory, mem.

type memtype is array(0 to 15) of
stdlogicvector(7 downto 0);

signal mem: memtype := (
X"a0", X"10", X"77", X"08",
X"80", X"c0", X"f0", X"00",
X"00", X"00", X"00", X"00",
X"00", X"00", X"00", X"00");

a. Decode the assembly language program implied by the memory values [9 pts], and the register transfer outcomes [7 pts.] for the program statements.

Label | Assembly Language Code | Register Transfer

Instructions in assembly language form (ALF) | Brief description of the instructions
IN DR | Input the 4 slide switch values (data input) into DR
OUT DR | Output the contents of DR to output port (OP) to four LEDs
MOV DR,SR | Move the contents of SR into DR
LOADI DR,Data | Load immediate Data into DR
ADDI DR,Data | Add immediate Data to the contents of DR, and place the result in DR
ADD DR,SR | Add the contents of SR to the contents of DR, and place the result in DR
SR0 DR,SR | Shift the contents of SR to the right 1 bit with 0 fill of the MSB, then place the result into DR
JNZ DR,Address | Jump if the contents of DR is not 0 to Address, else execute the next instruction

Instructions | OPCODE bit assignments
MOV | 000
LOADI | 001
ADD | 010
ADDI | 011
SR0 | 100
IN | 101
OUT | 110
JNZ | 111

d. Test the given program using Input="0110". Show the final status of the registers (including the instruction memory) by running the program to the last non-zero instruction. [9 pts.]

RO
RI
PC
IR
Instruction memory (16 x 8)
Output 0100 4 LEDs
Input 0101 4 switches

Added by Jeremiah J.

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