diff --git a/lib/FIFO/ghdl/tb_fifo_async.gtkw b/lib/FIFO/ghdl/tb_fifo_async.gtkw
new file mode 100644
index 0000000..f54a0ad
--- /dev/null
+++ b/lib/FIFO/ghdl/tb_fifo_async.gtkw
@@ -0,0 +1,35 @@
+[*]
+[*] GTKWave Analyzer v3.3.104 (w)1999-2020 BSI
+[*] Tue Mar 23 08:22:19 2021
+[*]
+[dumpfile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_fifo_async/tb_fifo_async.vcd"
+[dumpfile_mtime] "Tue Mar 23 08:21:16 2021"
+[dumpfile_size] 79616
+[savefile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_fifo_async/tb_fifo_async.gtkw"
+[timestart] 0
+[size] 1000 600
+[pos] 413 163
+*-30.757229 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+[sst_width] 233
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+[sst_vpaned_height] 144
+@29
+tb_fifo_async.rst
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+tb_fifo_async.clk_w
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+tb_fifo_async.fifo_full
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+@28
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+tb_fifo_async.clk_r
+tb_fifo_async.fifo_almost_empty
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diff --git a/lib/FIFO/ghdl/tb_fifo_sync.gtkw b/lib/FIFO/ghdl/tb_fifo_sync.gtkw
new file mode 100644
index 0000000..cfd4dd4
--- /dev/null
+++ b/lib/FIFO/ghdl/tb_fifo_sync.gtkw
@@ -0,0 +1,34 @@
+[*]
+[*] GTKWave Analyzer v3.3.104 (w)1999-2020 BSI
+[*] Tue Mar 23 08:21:05 2021
+[*]
+[dumpfile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_fifo_sync/tb_fifo_sync.vcd"
+[dumpfile_mtime] "Tue Mar 23 08:20:21 2021"
+[dumpfile_size] 38508
+[savefile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_fifo_sync/tb_fifo_sync.gtkw"
+[timestart] 0
+[size] 1000 600
+[pos] -1 -1
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diff --git a/lib/FIFO/ghdl/tb_gray_counter.gtkw b/lib/FIFO/ghdl/tb_gray_counter.gtkw
new file mode 100644
index 0000000..c944fc2
--- /dev/null
+++ b/lib/FIFO/ghdl/tb_gray_counter.gtkw
@@ -0,0 +1,27 @@
+[*]
+[*] GTKWave Analyzer v3.3.104 (w)1999-2020 BSI
+[*] Tue Mar 23 08:23:15 2021
+[*]
+[dumpfile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_gray_counter/tb_gray_counter.vcd"
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+[dumpfile_size] 12229
+[savefile] "/home/jens/work/vhdl/trunk/lib/FIFO/ghdl/build/tb_gray_counter/tb_gray_counter.gtkw"
+[timestart] 0
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+*-28.276766 274000000 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
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