diff --git a/wally-pipelined/testgen/privileged/testgen-CAUSE.py b/wally-pipelined/testgen/privileged/testgen-CAUSE.py
new file mode 100644
index 000000000..c4b331ac6
--- /dev/null
+++ b/wally-pipelined/testgen/privileged/testgen-CAUSE.py
@@ -0,0 +1,154 @@
+#!/usr/bin/python3
+##################################
+# testgen-CAUSE.py
+#
+# dottolia@hmc.edu 16 Mar 2021
+#
+# Generate directed and random test vectors for RISC-V Design Validation.
+##################################
+
+##################################
+# libraries
+##################################
+from datetime import datetime
+from random import randint 
+from random import seed
+from enum import Enum
+from random import getrandbits
+
+##################################
+# functions
+##################################
+
+# def computeExpected(a, b, test):
+#   if (test == "ADD"):
+#     return a + b
+#   elif (test == "SUB"):
+#     return a - b
+#   else:
+#     die("bad test name ", test)
+#   #  exit(1)
+
+def randRegs():
+  reg1 = randint(1,31)
+  reg2 = randint(1,31)
+  reg3 = randint(1,31)
+  if (reg1 == 6 or reg2 == 6 or reg3 == 6 or reg1 == reg2):
+    return randRegs()
+  else:
+      return reg1, reg2, reg3
+
+def writeVectors(storecmd):  
+  reg1, reg2, reg3 = randRegs()
+
+  lines = f"""
+  li x{reg1}, 0
+  """
+
+  write(lines, storecmd, reg1, 0)
+
+def write(lines, storecmd, reg, expected):
+  global testnum
+
+  lines = f"""
+    # Testcase {testnum}
+    {lines}
+
+    {storecmd} x{reg}, {str(wordsize*testnum)}(x6)
+    #RVTEST_IO_ASSERT_GPR_EQ(x0, 0, {formatstr.format(expected)})
+  """
+  f.write(lines)
+
+  if (xlen == 32):
+    line = formatrefstr.format(expected)+"\n"
+  else:
+    line = formatrefstr.format(expected % 2**32)+"\n" + formatrefstr.format(expected >> 32) + "\n"
+  r.write(line)
+  testnum = testnum+1
+
+##################################
+# main body
+##################################
+
+# name: (interrupt?, code)
+tests = {
+ 'User software interrupt': (1, '0'),
+ 'Supervisor software interrupt': (1, '1'),
+ 'Machine software interrupt': (1, '3'),
+ 'User timer interrupt': (1, '4'),
+ 'Supervisor timer interrupt': (1, '5'),
+ 'Machine timer interrupt': (1, '7'),
+ 'User external interrupt': (1, '8'),
+ 'Supervisor external interrupt': (1, '9'),
+ 'Machine external interrupt': (1, '11'),
+ 'Instruction address misaligned': (0, '0'),
+ 'Instruction access fault': (0, '1'),
+ 'Illegal instruction': (0, '2'),
+ 'Breakpoint': (0, '3'),
+ 'Load address misaligned': (0, '4'),
+ 'Load access fault': (0, '5'),
+ 'Store/AMO address misaligned': (0, '6'),
+ 'Store/AMO access fault': (0, '7'),
+ 'Environment call from U-mode': (0, '8'),
+ 'Environment call from S-mode': (0, '9'),
+ 'Environment call from M-mode': (0, '11'),
+ 'Instruction page fault': (0, '12'),
+ 'Load page fault': (0, '13'),
+ 'Store/AMO page fault': (0, '15'),
+}
+author = "dottolia@hmc.edu"
+xlens = [32, 64]
+numrand = 60;
+
+# setup
+seed(0xC395DDEB9173AD42) # make tests reproducible
+
+# generate files for each test
+for xlen in xlens:
+  formatstrlen = str(int(xlen/4))
+  formatstr = "0x{:0" + formatstrlen + "x}" # format as xlen-bit hexadecimal number
+  formatrefstr = "{:08x}" # format as xlen-bit hexadecimal number with no leading 0x
+  if (xlen == 32):
+    storecmd = "sw"
+    wordsize = 4
+  else:
+    storecmd = "sd"
+    wordsize = 8
+
+  imperaspath = "../../../imperas-riscv-tests/riscv-test-suite/privileged/"
+  basename = "WALLY-CAUSE-" + str(xlen)
+  fname = imperaspath + "src/" + basename + ".S"
+  refname = imperaspath + "references/" + basename + ".reference_output"
+  testnum = 0
+
+  # print custom header part
+  f = open(fname, "w")
+  r = open(refname, "w")
+  line = "///////////////////////////////////////////\n"
+  f.write(line)
+  lines="// "+fname+ "\n// " + author + "\n"
+  f.write(lines)
+  line ="// Created " + str(datetime.now()) 
+  f.write(line)
+
+  # insert generic header
+  h = open("../testgen_header.S", "r")
+  for line in h:  
+    f.write(line)
+
+  # print directed and random test vectors
+  writeVectors(storecmd)
+
+
+  # print footer
+  h = open("../testgen_footer.S", "r")
+  for line in h:  
+    f.write(line)
+
+  # Finish
+  lines = ".fill " + str(testnum) + ", " + str(wordsize) + ", -1\n"
+  lines = lines + "\nRV_COMPLIANCE_DATA_END\n" 
+  f.write(lines)
+  f.close()
+  r.close()
+