From b638050d1b49fa93cfa477e609751a146ffee861 Mon Sep 17 00:00:00 2001
From: Ali Mohammadpour <aliemohammadpour@gmail.com>
Date: Mon, 16 Nov 2020 18:24:09 +0330
Subject: [PATCH] Update Lab Material

---
 assignment-07/README.md                     | 55 +++++++++++++++++++++
 assignment-07/adder_subtractor_4bit.v       |  4 +-
 assignment-07/adder_subtractor_4bit_delay.v |  4 +-
 3 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/assignment-07/README.md b/assignment-07/README.md
index a6f5fcc..95faf0e 100644
--- a/assignment-07/README.md
+++ b/assignment-07/README.md
@@ -2,3 +2,58 @@
 
 ## Logic Circuits Lab 07
 
+### Goals
+
+- How describle full adder in gate level?
+- How design adder-subtractor by bit scale design
+- Structural implementation in Verilog
+
+### Pre-Report
+* Write verilog code for full adder in gate level.
+
+* Write verilog code for signle bit adder/subtractor in gate level.
+
+![ADDSUB](./raw/addsub.svg)
+
+* Write verilog code for 4-bit adder/subtractor using 1-bit adder/subtractor.
+
+![ADDSUB](./raw/addersubtractor.svg)
+
+
+### Grading Sources
+
+* Write verilog code for full adder of pre-report section (***full_adder.v***).
+
+* Write verilog code for 1-bit asser/subtractor of pre-report section (***addsub.v***).
+
+* Synthesis 1-bit adder/subtractor without any error and warning.
+
+* Save RTL Schematic of 1-bit adder/subtractor as a file and check its correctness.
+
+* Design 4 bits adder/subtractor using 1-bit adder/subtractor and write verilog code of it (***adder_subtractor_4bit.v***).
+
+* Complete testbench file of 4 bit adder/subtractor for validate the correctness of modules (***tb_adder_subtractor_4bit.v***).
+
+* Synthesis 4 bit adder/subtractor without any error and warning.
+
+* Write verilog code for full adder with delay (***full_adder_delay.v***)
+
+| NOT | AND2 | NAND2 | OR2 | NOR2 | XOR2 | AND3 | OR3 |
+|-----|------|-------|-----|------|------|------|-----| 
+| 2ns | 5ns  |  5ns  | 5ns |  5ns | 10ns | 5ns  | 5ns |
+ 
+* Write verilog code for deleyed version of adder subtractor  using deleyed full adder (***add_sub_deley.v***)
+
+* Write verilog code for deleyed version of 4 bit adder/subtractor  using deleyed adder/subtractor (***adder_subtractor_4bit_deley.v***)
+
+* Complete testbench file of 4 bit adder/subtractor for validate the correctness of modules (***tb_adder_subtractor_4bit.v***).
+
+* Report 4 bit adder maximum delay according to delay table.
+
+| NOT | AND2 | NAND2 | OR2 | NOR2 | XOR2 | AND3 | OR3 |
+|-----|------|-------|-----|------|------|------|-----| 
+| 2ns | 5ns  |  5ns  | 5ns |  5ns | 10ns | 5ns  | 5ns |
+
+### Submission Sources
+* Source files (Grading Sources)
+* Waveform of testbeches that covers all signals in `testbench.png` diagram
diff --git a/assignment-07/adder_subtractor_4bit.v b/assignment-07/adder_subtractor_4bit.v
index f0d4d50..fc4aa7f 100644
--- a/assignment-07/adder_subtractor_4bit.v
+++ b/assignment-07/adder_subtractor_4bit.v
@@ -23,9 +23,9 @@
 module adder_subtractor_4bit (
 	input [3:0] A ,
 	input [3:0] B ,
-	input 		sel , // 0: add, 1: subtract
+	input sel , // 0: add, 1: subtract
 	output [3:0] S ,
-	output 		cout
+	output cout
 );
 
 	/* write your code here */
diff --git a/assignment-07/adder_subtractor_4bit_delay.v b/assignment-07/adder_subtractor_4bit_delay.v
index dd93602..58fb1e2 100644
--- a/assignment-07/adder_subtractor_4bit_delay.v
+++ b/assignment-07/adder_subtractor_4bit_delay.v
@@ -23,9 +23,9 @@
 module adder_subtractor_4bit_delay (
 	input [3:0] A ,
 	input [3:0] B ,
-	input 		sel , // 0: add, 1: subtract
+	input sel , // 0: add, 1: subtract
 	output [3:0] S ,
-	output 		cout
+	output cout
 );
 
 	/* write your code here */