address coments

src/test/scala/simd/PETest.scala

@@ -105,7 +105,7 @@ class PEManualTest
             double_round: Bool,
             golden_output: Byte
         ) = {
-          dut.clock.step()
+          dut.clock.step(1)
 
           // giving input data
           dut.io.input_i.poke(input)
@@ -117,15 +117,15 @@ class PEManualTest
           dut.io.ctrl_i.max_int_i.poke(max_int)
           dut.io.ctrl_i.min_int_i.poke(min_int)
           dut.io.ctrl_i.double_round_i.poke(double_round)
-          dut.clock.step()
+          dut.clock.step(1)
 
           // grab the output data
           val out = dut.io.out_o.peekInt()
 
           // assert the PE's output data equals to the golden data
           assert(out == golden_output)
 
-          dut.clock.step()
+          dut.clock.step(1)
         }
 
         // manually random data test

src/test/scala/simd/SIMDTest.scala

@@ -105,13 +105,13 @@ trait HasSIMDTestUtils
   // give input data big bus to dut
   def giveInputData[T <: SIMD](dut: T, input: BigInt) = {
     // giving input data
-    dut.clock.step()
+    dut.clock.step(1)
     dut.io.data.input_i.bits.poke(input)
     dut.io.data.input_i.valid.poke(1.B)
     while (dut.io.data.input_i.ready.peekBoolean() == false) {
       dut.clock.step(1)
     }
-    dut.clock.step()
+    dut.clock.step(1)
 
   }
 
@@ -150,7 +150,7 @@ trait HasSIMDTestUtils
       doubleRound: Bool,
       goldenValue: Array[Byte]
   ) = {
-    dut.clock.step()
+    dut.clock.step(1)
 
     // giving the configuration
     dut.io.ctrl.bits.input_zp_i.poke(input_zp)
@@ -164,7 +164,7 @@ trait HasSIMDTestUtils
     while (dut.io.ctrl.ready.peekBoolean() == false) {
       dut.clock.step(1)
     }
-    dut.clock.step()
+    dut.clock.step(1)
 
     dut.io.ctrl.valid.poke(0)
 
@@ -174,7 +174,7 @@ trait HasSIMDTestUtils
     // get output and check
     checkSIMDOutput(dut, goldenValue)
 
-    dut.clock.step()
+    dut.clock.step(1)
   }
 
 }
@@ -190,7 +190,7 @@ class SIMDAutoTest
         Seq(WriteVcdAnnotation)
       ) { dut =>
         // set test number
-        val testNum = 1
+        val testNum = 100
 
         // random test data generation
         for (i <- 1 to testNum) {