From 093cf353b791452dd95b5e10ae1e10cf0c07ab77 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 12 Apr 2019 08:25:04 +0100
Subject: [PATCH] add 2-stage FIFO (add1) example

---
 src/add/test_buf_pipe.py | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/add/test_buf_pipe.py b/src/add/test_buf_pipe.py
index 969fff73..b04a96a5 100644
--- a/src/add/test_buf_pipe.py
+++ b/src/add/test_buf_pipe.py
@@ -877,6 +877,33 @@ class FIFOTestRecordAddStageControl(FIFOControl):
 # Test 25
 ######################################################################
 
+class FIFOTestAdd16(FIFOControl):
+
+    def __init__(self):
+        stage = ExampleStageCls()
+        FIFOControl.__init__(self, 2, stage)
+
+
+class ExampleFIFOAdd2Pipe(ControlBase):
+
+    def elaborate(self, platform):
+        m = ControlBase._elaborate(self, platform)
+
+        pipe1 = FIFOTestAdd16()
+        pipe2 = FIFOTestAdd16()
+
+        m.submodules.pipe1 = pipe1
+        m.submodules.pipe2 = pipe2
+
+        m.d.comb += self.connect([pipe1, pipe2])
+
+        return m
+
+
+######################################################################
+# Test 26
+######################################################################
+
 def iospecfn24():
     return (Signal(16, name="src1"), Signal(16, name="src2"))
 
@@ -1223,6 +1250,18 @@ if __name__ == '__main__':
         f.write(vl)
     run_simulation(dut, [test.send, test.rcv], vcd_name="test_addrecord24.vcd")
 
+    print ("test 25")
+    dut = ExampleFIFOAdd2Pipe()
+    data = data_chain1()
+    test = Test5(dut, resultfn_9, data=data)
+    run_simulation(dut, [test.send, test.rcv], vcd_name="test_add2pipe25.vcd")
+    ports = [dut.p.i_valid, dut.n.i_ready,
+             dut.n.o_valid, dut.p.o_ready] + \
+             [dut.p.i_data] + [dut.n.o_data]
+    vl = rtlil.convert(dut, ports=ports)
+    with open("test_add2pipe25.il", "w") as f:
+        f.write(vl)
+
     print ("test 997")
     dut = ExampleBufPassThruPipe2()
     data = data_chain1()
-- 
2.30.2