the ALU and the register file, then you will connect them together and run a simple machine code

program on them.

In order to ensure that your design is related to yourself, various aspects of the design will be dictated by

your student ID number. These include the machine code used by your design, the contents of the register

file. This means that every student should have a unique design.

You have to work individually in this project and submit a report about your design and implementation

of this project.

Part $1$

The ALU

Write a VERILOG description of an ALU with two $32-$bit inputs, A and B$,$ and a $32-$bit output Result

$($module alu$).$

The result is derived from one or both of the inputs according to the value of a $6-$bit opcode. The

operations that the ALU can perform are listed below:

$$ a $+$ b

$$ a $-$ b

$|$a$|($i$.$e$.$ the absolute value of a$)$

$-$a

$$ max $($a$,$ b$)($i$.$e$.$ the maximum of a and b$)$

$$ min $($a$,$ b$)($i$.$e$.$ the minimum of a and b$)$

$$ avg$($a$,$b$)($i$.$e$.$ the average of a and b $$ the integer part only and remainder is ignored$)$

$$ not a

$$ a or b

$$ a and b

$$ a xor b

$2$

The opcode that will be used to represent each of these operations is determined by the last digit of your

students ID number. The table below shows which opcode you should use in your design for each

instruction.

Digit of

ID no$.$

$0123456789$

a $+$ b $8664634415$

a $$ b $98911215101468$

$|$a$|21018513381313$

$-$a $101256412121187$

max$($a$,$b$)12147137771073$

min $($a$,$b$)1118141012146$

avg$($a$,$b$)1313117996131110$

not a $5151491310136152$

a or b $421312814149315$

a and b $113121011111554$

a xor b $159453587212$

So$,$ for example if your ID is $1221438$ then the last digit is $8.$

Then a$+$b is to be represented by opcode $1,$ a$-$b is to be represented by opcode $6,|$a$|$ is to be represented

by opcode $13$ and so on$.($These are shown as denary $($base $10)$ values; your design may use binary or

hexadecimal values.$)$

The register file

Inside a modern processor there is a very small amount of memory that is used to hold the operands that it

is presently working on$.$ This is called the register file, and normally has the following appearance

$($module reg$\_$file$).$

This is a very small fast RAM, typically holding $32$ x $32-$bit words, and therefore requiring a $5-$bit address

to select out one of the $32-$bit words. It is unlike normal RAM in that it can process three addresses at the

same time, two of which are always read operations, and one of which is always written to$.$

Output $1$ produces the item within the register file that is address by Address $1.$ Similarly Output $2$

produces the item within the register file that is address by Address $2.$ Input is used to supply a value that

is written into the location addressed by Address $3.$

The initial values stored in the register file are determined by the second$-$from$-$last digit of your student

ID$,$ and are shown in the table below:

$3$

ID$/$

Location

$0123456789$

$00000000000$

$17942116621264212996419811930461615034598616302$

$21322411562105921149055965348116408854122502994$

$3154621533062307070144267308112541704821658$

$4802695948940602676121568467867226142465474$

$5369214746877633226638123466784448051246784$

$698823288943610344100409716124328928184810836$

$782485932305667343930782013548730252604648$

$8343219784850158344150519013462892216170524$

$91784912340615314640614702134541044476612200$

$10237823801238060005400563011780670642983286$

$118302192654812196857223521317025861014734$

$12592127261305411290163241542429827354151010998$

$137430176280013350884026708096329497944420$

$14105728408129882086825841725141474074568754$

$157676839495667341122843003600653255803246$

$161238136042194743084624744108701043693009040$

$17160081022211914141021328412861252811900123148714$

$18242672621586413200467681229860146941280612008$