diff --git a/ARCH/openfpga_arch_template/k4_frac_N8_register_scan_chain_caravel_io_skywater130nm_fdhd_cc_openfpga.xml b/ARCH/openfpga_arch_template/k4_frac_N8_register_scan_chain_caravel_io_skywater130nm_fdhd_cc_openfpga.xml
new file mode 100644
index 0000000..d4ee0fa
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+++ b/ARCH/openfpga_arch_template/k4_frac_N8_register_scan_chain_caravel_io_skywater130nm_fdhd_cc_openfpga.xml
@@ -0,0 +1,249 @@
+<!-- Architecture annotation for OpenFPGA framework
+     This annotation supports the k4_frac_cc_sky130nm.xml
+     - General purpose logic block
+       - K = 6, N = 10, I = 40
+       - Single mode
+     - Routing architecture
+       - L = 4, fc_in = 0.15, fc_out = 0.1
+     - Skywater 130nm PDK
+       - circuit models are binded to the opensource skywater
+         foundry middle-speed (ms) standard cell library
+  -->
+<openfpga_architecture>
+  <technology_library>
+    <device_library>
+      <device_model name="logic" type="transistor">
+        <lib type="industry" corner="TOP_TT" ref="M" path="${OPENFPGA_PATH}/openfpga_flow/tech/PTM_45nm/45nm.pm"/>
+        <design vdd="0.9" pn_ratio="2"/>
+        <pmos name="pch" chan_length="40e-9" min_width="140e-9" variation="logic_transistor_var"/>
+        <nmos name="nch" chan_length="40e-9" min_width="140e-9" variation="logic_transistor_var"/>
+      </device_model>
+      <device_model name="io" type="transistor">
+        <lib type="academia" ref="M" path="${OPENFPGA_PATH}/openfpga_flow/tech/PTM_45nm/45nm.pm"/>
+        <design vdd="2.5" pn_ratio="3"/>
+        <pmos name="pch_25" chan_length="270e-9" min_width="320e-9" variation="io_transistor_var"/>
+        <nmos name="nch_25" chan_length="270e-9" min_width="320e-9" variation="io_transistor_var"/>
+      </device_model>
+    </device_library>
+    <variation_library>
+      <variation name="logic_transistor_var" abs_deviation="0.1" num_sigma="3"/>
+      <variation name="io_transistor_var" abs_deviation="0.1" num_sigma="3"/>
+    </variation_library>
+  </technology_library>
+  <circuit_library>
+    <circuit_model type="inv_buf" name="sky130_fd_sc_hd__inv_1" prefix="sky130_fd_sc_hd__inv_1" is_default="true" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/inv/sky130_fd_sc_hd__inv_1.v">
+      <design_technology type="cmos" topology="inverter" size="1"/>
+      <device_technology device_model_name="logic"/>
+      <port type="input" prefix="in" lib_name="A" size="1"/>
+      <port type="output" prefix="out" lib_name="Y" size="1"/>
+      <delay_matrix type="rise" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+      <delay_matrix type="fall" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+    </circuit_model>
+    <circuit_model type="inv_buf" name="sky130_fd_sc_hd__buf_2" prefix="sky130_fd_sc_hd__buf_2" is_default="false" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/buf/sky130_fd_sc_hd__buf_2.v">
+      <design_technology type="cmos" topology="buffer" size="1" num_level="2" f_per_stage="2"/>
+      <device_technology device_model_name="logic"/>
+      <port type="input" prefix="in" lib_name="A" size="1"/>
+      <port type="output" prefix="out" lib_name="X" size="1"/>
+      <delay_matrix type="rise" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+      <delay_matrix type="fall" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+    </circuit_model>
+    <circuit_model type="inv_buf" name="sky130_fd_sc_hd__buf_4" prefix="sky130_fd_sc_hd__buf_4" is_default="false" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/buf/sky130_fd_sc_hd__buf_4.v">
+      <design_technology type="cmos" topology="buffer" size="1" num_level="2" f_per_stage="4"/>
+      <device_technology device_model_name="logic"/>
+      <port type="input" prefix="in" lib_name="A" size="1"/>
+      <port type="output" prefix="out" lib_name="X" size="1"/>
+      <delay_matrix type="rise" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+      <delay_matrix type="fall" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+    </circuit_model>
+    <circuit_model type="inv_buf" name="sky130_fd_sc_hd__inv_2" prefix="sky130_fd_sc_hd__inv_2" is_default="false" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/inv/sky130_fd_sc_hd__inv_2.v">
+      <design_technology type="cmos" topology="buffer" size="1"/>
+      <device_technology device_model_name="logic"/>
+      <port type="input" prefix="in" lib_name="A" size="1"/>
+      <port type="output" prefix="out" lib_name="Y" size="1"/>
+      <delay_matrix type="rise" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+      <delay_matrix type="fall" in_port="in" out_port="out">
+        10e-12
+      </delay_matrix>
+    </circuit_model>
+    <circuit_model type="gate" name="sky130_fd_sc_hd__or2_1" prefix="sky130_fd_sc_hd__or2_1" is_default="true" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/or2/sky130_fd_sc_hd__or2_1.v">
+      <design_technology type="cmos" topology="OR"/>
+      <device_technology device_model_name="logic"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="false"/>
+      <port type="input" prefix="a" lib_name="A" size="1"/>
+      <port type="input" prefix="b" lib_name="B" size="1"/>
+      <port type="output" prefix="out" lib_name="X" size="1"/>
+      <delay_matrix type="rise" in_port="a b" out_port="out">
+        10e-12 5e-12
+      </delay_matrix>
+      <delay_matrix type="fall" in_port="a b" out_port="out">
+        10e-12 5e-12
+      </delay_matrix>
+    </circuit_model>
+    <!-- Define a circuit model for the standard cell MUX2
+         OpenFPGA requires the following truth table for the MUX2
+         When the select signal sel is enabled, the first input, i.e., in0
+         will be propagated to the output, i.e., out
+         If your standard cell provider does not offer the exact truth table,
+         you can simply swap the inputs as shown in the example below
+      -->
+    <circuit_model type="gate" name="sky130_fd_sc_hd__mux2_1" prefix="sky130_fd_sc_hd__mux2_1" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/mux2/sky130_fd_sc_hd__mux2_1.v">
+      <design_technology type="cmos" topology="MUX2"/>
+      <device_technology device_model_name="logic"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="false"/>
+      <port type="input" prefix="in0" lib_name="A1" size="1"/>
+      <port type="input" prefix="in1" lib_name="A0" size="1"/>
+      <port type="input" prefix="sel" lib_name="S" size="1"/>
+      <port type="output" prefix="out" lib_name="X" size="1"/>
+    </circuit_model>
+    <circuit_model type="chan_wire" name="chan_segment" prefix="track_seg" is_default="true">
+      <design_technology type="cmos"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="false"/>
+      <port type="input" prefix="in" size="1"/>
+      <port type="output" prefix="out" size="1"/>
+      <wire_param model_type="pi" R="101" C="22.5e-15" num_level="1"/>
+      <!-- model_type could be T, res_val and cap_val DON'T CARE -->
+    </circuit_model>
+    <circuit_model type="wire" name="direct_interc" prefix="direct_interc" is_default="true">
+      <design_technology type="cmos"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="false"/>
+      <port type="input" prefix="in" size="1"/>
+      <port type="output" prefix="out" size="1"/>
+      <wire_param model_type="pi" R="0" C="0" num_level="1"/>
+      <!-- model_type could be T, res_val cap_val should be defined -->
+    </circuit_model>
+    <circuit_model type="mux" name="mux_tree" prefix="mux_tree" is_default="true" dump_structural_verilog="true">
+      <design_technology type="cmos" structure="tree" add_const_input="true" const_input_val="1"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="false"/>
+      <pass_gate_logic circuit_model_name="sky130_fd_sc_hd__mux2_1"/>
+      <port type="input" prefix="in" size="1"/>
+      <port type="output" prefix="out" size="1"/>
+      <port type="sram" prefix="sram" size="1"/>
+    </circuit_model>
+    <circuit_model type="mux" name="mux_tree_tapbuf" prefix="mux_tree_tapbuf" dump_structural_verilog="true">
+      <design_technology type="cmos" structure="tree" add_const_input="true" const_input_val="1"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__buf_4"/>
+      <pass_gate_logic circuit_model_name="sky130_fd_sc_hd__mux2_1"/>
+      <port type="input" prefix="in" size="1"/>
+      <port type="output" prefix="out" size="1"/>
+      <port type="sram" prefix="sram" size="1"/>
+    </circuit_model>
+    <!--DFF subckt ports should be defined as <D> <Q> <CLK> <RESET> <SET>  -->
+    <circuit_model type="ff" name="sky130_fd_sc_hd__sdfxtp_1" prefix="sky130_fd_sc_hd__sdfxtp_1" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/sdfxtp/sky130_fd_sc_hd__sdfxtp_1.v">
+      <design_technology type="cmos"/>
+      <input_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <output_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <port type="input" prefix="D" size="1"/>
+      <port type="input" prefix="DI" lib_name="SCD" size="1"/>
+      <port type="input" prefix="Test_en" lib_name="SCE" size="1" is_global="true" default_val="0"/>
+      <!-- <port type="input" prefix="reset" lib_name="RESET_B" size="1" is_global="true" default_val="1" is_reset="true"/> -->
+      <port type="output" prefix="Q" size="1"/>
+      <port type="clock" prefix="clk" lib_name="CLK" size="1" is_global="true" default_val="0" />
+    </circuit_model>
+    <circuit_model type="lut" name="frac_lut4" prefix="frac_lut4" dump_structural_verilog="true">
+      <design_technology type="cmos" fracturable_lut="true"/>
+      <input_buffer exist="false"/>
+      <output_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__buf_2"/>
+      <lut_input_inverter exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <lut_input_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__buf_2"/>
+      <lut_intermediate_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__buf_2" location_map="-1-"/>
+      <pass_gate_logic circuit_model_name="sky130_fd_sc_hd__mux2_1"/>
+      <port type="input" prefix="in" size="4" tri_state_map="---1" circuit_model_name="sky130_fd_sc_hd__or2_1"/>
+      <port type="output" prefix="lut3_out" size="2" lut_frac_level="3" lut_output_mask="0,1"/>
+      <port type="output" prefix="lut4_out" size="1" lut_output_mask="0"/>
+      <port type="sram" prefix="sram" size="16"/>
+      <port type="sram" prefix="mode" size="1" mode_select="true" circuit_model_name="sky130_fd_sc_hd__dfxbp_1" default_val="1"/>
+    </circuit_model>
+    <!--Scan-chain DFF subckt ports should be defined as <D> <Q> <Qb> <CLK> <RESET> <SET>  -->
+    <circuit_model type="ccff" name="sky130_fd_sc_hd__dfxbp_1" prefix="sky130_fd_sc_hd__dfxbp_1" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/PDK/skywater-pdk/libraries/sky130_fd_sc_hd/latest/cells/dfxbp/sky130_fd_sc_hd__dfxbp_1.v">
+      <design_technology type="cmos"/>
+      <input_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <output_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <port type="input" prefix="D" size="1"/>
+      <port type="output" prefix="Q" size="1"/>
+      <port type="output" prefix="Q_N" size="1"/>
+      <port type="clock" prefix="prog_clk" lib_name="CLK" size="1" is_global="true" default_val="0" is_prog="true"/>
+    </circuit_model>
+    <circuit_model type="iopad" name="EMBEDDED_IO" prefix="EMBEDDED_IO" is_default="true" verilog_netlist="${SKYWATER_OPENFPGA_HOME}/HDL/common/digital_io_hd.v">
+      <design_technology type="cmos"/>
+      <input_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <output_buffer exist="true" circuit_model_name="sky130_fd_sc_hd__inv_1"/>
+      <port type="input" prefix="SOC_IN" lib_name="SOC_IN" size="1" is_global="true" is_io="true" is_data_io="true"/>
+      <port type="output" prefix="SOC_OUT" lib_name="SOC_OUT" size="1" is_global="true" is_io="true" is_data_io="true"/>
+      <port type="output" prefix="SOC_DIR" lib_name="SOC_DIR" size="1" is_global="true" is_io="true"/>
+      <port type="output" prefix="inpad" lib_name="FPGA_IN" size="1"/>
+      <port type="input" prefix="outpad" lib_name="FPGA_OUT" size="1"/>
+      <port type="sram" prefix="en" lib_name="FPGA_DIR" size="1" mode_select="true" circuit_model_name="sky130_fd_sc_hd__dfxbp_1" default_val="1"/>
+    </circuit_model>
+  </circuit_library>
+  <configuration_protocol>
+    <organization type="scan_chain" circuit_model_name="sky130_fd_sc_hd__dfxbp_1" num_regions="1"/>
+  </configuration_protocol>
+  <connection_block>
+    <switch name="ipin_cblock" circuit_model_name="mux_tree_tapbuf"/>
+  </connection_block>
+  <switch_block>
+    <switch name="L1_mux" circuit_model_name="mux_tree_tapbuf"/>
+    <switch name="L2_mux" circuit_model_name="mux_tree_tapbuf"/>
+    <switch name="L4_mux" circuit_model_name="mux_tree_tapbuf"/>
+  </switch_block>
+  <routing_segment>
+    <segment name="L1" circuit_model_name="chan_segment"/>
+    <segment name="L2" circuit_model_name="chan_segment"/>
+    <segment name="L4" circuit_model_name="chan_segment"/>
+  </routing_segment>
+  <direct_connection>
+    <direct name="shift_register" circuit_model_name="direct_interc" type="column" x_dir="positive" y_dir="positive"/>
+    <direct name="scan_chain" circuit_model_name="direct_interc" type="column" x_dir="positive" y_dir="positive"/>
+  </direct_connection>
+  <pb_type_annotations>
+    <!-- physical pb_type binding in complex block IO -->
+    <pb_type name="io" physical_mode_name="physical" idle_mode_name="inpad"/>
+    <pb_type name="io[physical].iopad" circuit_model_name="EMBEDDED_IO" mode_bits="1"/> 
+    <pb_type name="io[inpad].inpad" physical_pb_type_name="io[physical].iopad" mode_bits="1"/> 
+    <pb_type name="io[outpad].outpad" physical_pb_type_name="io[physical].iopad" mode_bits="0"/> 
+    <!-- End physical pb_type binding in complex block IO -->
+
+    <!-- physical pb_type binding in complex block CLB -->
+    <!-- physical mode will be the default mode if not specified -->
+    <pb_type name="clb.fle" physical_mode_name="physical"/>
+    <pb_type name="clb.fle[physical].fabric.frac_logic.frac_lut4" circuit_model_name="frac_lut4" mode_bits="0"/>
+    <pb_type name="clb.fle[physical].fabric.ff" circuit_model_name="sky130_fd_sc_hd__sdfxtp_1"/>
+    <!-- Binding operating pb_type to physical pb_type -->
+    <pb_type name="clb.fle[n2_lut3].lut3inter.ble3.lut3" physical_pb_type_name="clb.fle[physical].fabric.frac_logic.frac_lut4" mode_bits="1" physical_pb_type_index_factor="0.5">
+      <!-- Binding the lut3 to the first 3 inputs of fracturable lut4 -->
+      <port name="in" physical_mode_port="in[0:2]"/>
+      <port name="out" physical_mode_port="lut3_out[0:0]" physical_mode_pin_rotate_offset="1"/>
+    </pb_type>
+    <pb_type name="clb.fle[n2_lut3].lut3inter.ble3.ff" physical_pb_type_name="clb.fle[physical].fabric.ff"/>
+    <!-- Binding operating pb_types in mode 'ble4' -->
+    <pb_type name="clb.fle[n1_lut4].ble4.lut4" physical_pb_type_name="clb.fle[physical].fabric.frac_logic.frac_lut4" mode_bits="0">
+      <!-- Binding the lut4 to the first 4 inputs of fracturable lut4 -->
+      <port name="in" physical_mode_port="in[0:3]"/>
+      <port name="out" physical_mode_port="lut4_out"/>
+    </pb_type>
+    <pb_type name="clb.fle[n1_lut4].ble4.ff" physical_pb_type_name="clb.fle[physical].fabric.ff" physical_pb_type_index_factor="2" physical_pb_type_index_offset="0"/>
+    <!-- Binding operating pb_types in mode 'shift_register' -->
+    <pb_type name="clb.fle[shift_register].shift_reg.ff" physical_pb_type_name="clb.fle[physical].fabric.ff"/>
+    <!-- End physical pb_type binding in complex block IO -->
+  </pb_type_annotations>
+</openfpga_architecture>