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transform="translate(0)"/><use xlink:href="#000" transform="translate(20)"/><use xlink:href="#000" transform="translate(40)"/><use xlink:href="#000" transform="translate(60)"/><use xlink:href="#0m1" transform="translate(80)"/><use xlink:href="#111" transform="translate(100)"/><use xlink:href="#111" transform="translate(120)"/><use xlink:href="#111" transform="translate(140)"/><use xlink:href="#111" transform="translate(160)"/><use xlink:href="#111" transform="translate(180)"/><use xlink:href="#111" transform="translate(200)"/><use xlink:href="#111" transform="translate(220)"/><use xlink:href="#111" transform="translate(240)"/><use xlink:href="#111" transform="translate(260)"/><use xlink:href="#111" transform="translate(280)"/><use xlink:href="#111" transform="translate(300)"/></g></g><g id="wavelane_2_0" transform="translate(0,65)"><text x="-10" y="15" class="info" text-anchor="end" xml:space="preserve"><tspan>FPGA_DIR</tspan></text><g id="wavelane_draw_2_0" transform="translate(0, 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id="wavelane_draw_4_0" transform="translate(0, 0)"><use xlink:href="#000" transform="translate(0)"/><use xlink:href="#000" transform="translate(20)"/><use xlink:href="#0m1" transform="translate(40)"/><use xlink:href="#111" transform="translate(60)"/><use xlink:href="#1m0" transform="translate(80)"/><use xlink:href="#000" transform="translate(100)"/><use xlink:href="#0m1" transform="translate(120)"/><use xlink:href="#111" transform="translate(140)"/><use xlink:href="#1m0" transform="translate(160)"/><use xlink:href="#000" transform="translate(180)"/><use xlink:href="#0m1" transform="translate(200)"/><use xlink:href="#111" transform="translate(220)"/><use xlink:href="#1m0" transform="translate(240)"/><use xlink:href="#000" transform="translate(260)"/><use xlink:href="#0m1" transform="translate(280)"/><use xlink:href="#111" transform="translate(300)"/></g></g><g id="wavelane_5_0" transform="translate(0,155)"><text x="-10" y="15" class="info" text-anchor="end" xml:space="preserve"><tspan>FPGA_IN</tspan></text><g id="wavelane_draw_5_0" transform="translate(0, 0)"><use xlink:href="#000" transform="translate(0)"/><use xlink:href="#000" transform="translate(20)"/><use xlink:href="#0m1" transform="translate(40)"/><use xlink:href="#111" transform="translate(60)"/><use xlink:href="#1m0" transform="translate(80)"/><use xlink:href="#000" transform="translate(100)"/><use xlink:href="#0m1" transform="translate(120)"/><use xlink:href="#111" transform="translate(140)"/><use xlink:href="#1mx" transform="translate(160)"/><use xlink:href="#xxx" transform="translate(180)"/><use xlink:href="#xxx" transform="translate(200)"/><use xlink:href="#xxx" transform="translate(220)"/><use xlink:href="#xxx" transform="translate(240)"/><use xlink:href="#xxx" transform="translate(260)"/><use xlink:href="#xxx" transform="translate(280)"/><use xlink:href="#xxx" transform="translate(300)"/></g></g><g id="wavelane_6_0" transform="translate(0,185)"><text x="-10" y="15" 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\ No newline at end of file
diff --git a/DOC/source/datasheet/sofa_hd/sofa_hd_circuit_design.rst b/DOC/source/datasheet/sofa_hd/sofa_hd_circuit_design.rst
index 7f3105a..b304368 100644
--- a/DOC/source/datasheet/sofa_hd/sofa_hd_circuit_design.rst
+++ b/DOC/source/datasheet/sofa_hd/sofa_hd_circuit_design.rst
@@ -35,6 +35,21 @@ The truth table of the I/O cell is consistent with the GPIO cell of Caravel SoC
 
   Schematic of embedded I/O cell used in FPGA
 
+:numref:`fig_sofa_hd_embedded_io_test_waveform` shows an example waveform about how the I/O cell works:
+
+- When ``IO_ISOL_N`` is enabled/disabled
+- When operates in input mode
+- When operates in output mode
+
+.. _fig_sofa_hd_embedded_io_test_waveform:
+
+.. figure:: ./figures/sofa_hd_embedded_io_test_waveform.svg
+  :scale: 30%
+  :alt: Schematic of embedded I/O cell used in FPGA
+
+  An example of waveforms of embedded I/O cell used in FPGA
+
+
 .. _sofa_hd_circuit_design_mux:
 
 Multiplexer