processor related question

hello experts

I need someone to check my answer
I want to know reason that I have explained in my post is right or wrong ?


Q1.Why ALU is 8 bit ?
If data is 8 bit so ALU should be 8 bit
if data is 4 bit then alu should be 4 bit
if data is 6 bit then alu should be 6 bit
if data is 16 bit then alu should be 16 bit

Q2.Why Program memory is 4x16 bit ?
Instruction are 4 bits so program mmory should be 4x16 bit
Instruction are 8 bits so program mmory should be 8x256 bit
Instruction are 6 bits so program mmory should be 6x64 bit


Q3.Why Data memory is 8 x 256 bit ?
If data is 8 bit , ALU is 8 bit so data memory should be 8 x 256
if data is 4 bit data memory should be 4x16

Q4.Why 4 to 16 Instruction decoder
To decode for 16 operation I think I need 4 control word so I use 4 to 16 Instruction decoder
8 instruction need 3 to 8 decoder
32 instruction need 5 to 32 decoder


Q5. Why Program counter 4 bit ?
4 bit program counter can address 16 instructions
8 bit program counter can address 256 instructions
16bit 4 bit program counter can address around 6500 instructions

Q6.general purpose register ?
data is 8 bit so accumulator A should be 8 bit
data is 8 bit so Data register R1 should 8 bit
data is 8 bit soData register R2 should be 8 bit
data is 8 bit so Data register R3 should be 8 bit
data is 8 bit so Data register R4 should be 8 bit

Q7. Instruction register 4 bit?
instruction is 4 bit so Instruction register should be 4 bit
instruction is 8 bit so instruction register should be 8 bit

Q8 address is 4 bit ?
address is 4 bit so address register should be 4 bit
address is 8 bit so address register should be 4 bit

You don't really explain your answers - I hope you've written a bit more for your actual answers!

Misterbenn said:

You don't really explain your answers - I hope you've written a bit more for your actual answers!

Click to expand...

actually I am waiting response from other experts
I will explain all but I Want confirm that my answers are correct .

A lot of these questions are stupid.

vead said:

Q1.Why ALU is 8 bit ?
If data is 8 bit so ALU should be 8 bit
if data is 4 bit then alu should be 4 bit
if data is 6 bit then alu should be 6 bit
if data is 16 bit then alu should be 16 bit

Click to expand...

Do you count flags and carry?

Q2.Why Program memory is 4x16 bit ?
Instruction are 4 bits so program mmory should be 4x16 bit
Instruction are 8 bits so program mmory should be 8x256 bit
Instruction are 6 bits so program mmory should be 6x64 bit

Click to expand...

Makes no sense.

Q3.Why Data memory is 8 x 256 bit ?
If data is 8 bit , ALU is 8 bit so data memory should be 8 x 256
if data is 4 bit data memory should be 4x16

Click to expand...

Memory management messes this up completely unless your talking about absolute addressing.

Q4.Why 4 to 16 Instruction decoder
To decode for 16 operation I think I need 4 control word so I use 4 to 16 Instruction decoder
8 instruction need 3 to 8 decoder
32 instruction need 5 to 32 decoder

Click to expand...

The answer could change based on RISC or CISC archetecture.

Q5. Why Program counter 4 bit ?
4 bit program counter can address 16 instructions
8 bit program counter can address 256 instructions
16bit 4 bit program counter can address around 6500 instructions

Click to expand...

16 bit - 65,000 or 65536 actually. 16 bits -32768 to +32767 0 to 65535

Q6.general purpose register ?
data is 8 bit so accumulator A should be 8 bit
data is 8 bit so Data register R1 should 8 bit
data is 8 bit soData register R2 should be 8 bit
data is 8 bit so Data register R3 should be 8 bit
data is 8 bit so Data register R4 should be 8 bit

Click to expand...

What about multiplies?

Q7. Instruction register 4 bit?
instruction is 4 bit so Instruction register should be 4 bit
instruction is 8 bit so instruction register should be 8 bit

Click to expand...

Not in a CISC architecture. Instructions can be MULTIPLE memory locations.

Q8 address is 4 bit ?
address is 4 bit so address register should be 4 bit
address is 8 bit so address register should be 4 bit

Click to expand...

Memory management again.

I would chew these questions up if they were exam questions.

KeepItSimpleStupid said:

A lot of these questions are stupid.

I would chew these questions up if they were exam questions.

Click to expand...

No thats question was created by me just for learning some basics
thats the point you are correct I did mistake in many place

I think I am missing lot
can you give me some home work like that questions ?
or
can you help me to improve that question ?

You're in SCHOOL DO YOUR F'N HOMEWORK !!
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This person wants to be fed a fish dinner..... Bad Dog, No Biscuit

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... oh and degrees in Business & Engineering from Michigan State.
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