diff --git a/.svlint.toml b/.svlint.toml
new file mode 100644
index 0000000..50f3eca
--- /dev/null
+++ b/.svlint.toml
@@ -0,0 +1,2 @@
+[textrules]
+header_copyright = false
diff --git a/ch4/.svlint.toml b/ch4/.svlint.toml
new file mode 100644
index 0000000..50f3eca
--- /dev/null
+++ b/ch4/.svlint.toml
@@ -0,0 +1,2 @@
+[textrules]
+header_copyright = false
diff --git a/ch4/timebase.sv b/ch4/timebase.sv
new file mode 100644
index 0000000..e66f979
--- /dev/null
+++ b/ch4/timebase.sv
@@ -0,0 +1 @@
+`timescale 1ns/1ps
diff --git a/ch4/timebase_tb.sv b/ch4/timebase_tb.sv
new file mode 100644
index 0000000..0e374f4
--- /dev/null
+++ b/ch4/timebase_tb.sv
@@ -0,0 +1,21 @@
+`timescale 1ns/1ps
+
+module timebase_tb();
+
+   logic clk;
+   logic reset;
+   logic [20:0] count;
+   
+   timebase test (clk, reset, count);
+
+   always
+      #5 clk = ~clk;
+   initial
+      clk = 0;
+
+   initial begin
+          reset = 1; 
+     #10; reset = 0; 
+   end
+
+endmodule