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Update file_organization.rst 

Creation of the table for better understanding
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docs/source/fpga_spice/file_organization.rst
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@ -5,15 +5,17 @@ All the generated SPICE netlists are located in the <spice_dir> as you specify i
Under the <spice_dir>, FPGA-SPICE creates a number of folders: include, subckt, lut_tb, dff_tb, grid_tb, pb_mux_tb, cb_mux_tb, sb_mux_tb, top_tb, results. Under the <spice_dir>, FPGA-SPICE also creates a shell script called run_hspice_sim.sh, which run all the simulations for all the testbenches.
The folders contain the sub-circuits and testbenches and their contents are shown as following.
Folder Content
include The header files which contain the parameters for stimulate and measurement, as defined in <tech_lib>
subckt Contain all the auto-generated sub-circuits, such as inverters, buffers, transmission gates, multiplexers, LUTs and even logic blocks, connection boxes and switch blocks.
lut_tb Contain all the testbenches for LUTs. This folder is created only when option print_spice_lut_testbench is enabled.
dff_tb Contain all the testbenches for FFs. This folder is created only when option print_spice_dff_testbench is enabled.
grid_tb Contain all the testbenches for logic blocks (grid-level testbenches). This folder is created only when option print_spice_grid_testbench is enabled.
pb_mux_tb Contain the testbenches for the multiplexers inside logic blocks. This folder is created only when option print_spice_pbmux_test-bench is enabled.
cb_mux_tb Contain all the testbenches for the multiplexers inside connection boxes. This folder is created only when option print_spice_cbmux_testbench is enabled.
sb_mux_tb Contain all the testbenches for the multiplexers inside switch blocks. This folder is created only when option print_spice_sbmux_test-bench is enabled.
top_tb Contain the full-chip-level testbench. This folder is created only when option print_spice_top_testbench is enabled.
results An empty folder when created. It stores all the simulation results by running the shell script run_hspice_sim.sh.
.. csv-table:: Folder hierarchy of FPGA-SPICE
:header: "Folder", "Content includes the header files which contain the parameters for stimulate and measurement, as defined in <tech_lib>"
:widths: 10, 20
"subckt", "Contain all the auto-generated sub-circuits, such as inverters, buffers, transmission gates, multiplexers, LUTs and even logic blocks, connection boxes and switch blocks."
"lut_tb", "Contain all the testbenches for LUTs. This folder is created only when option print_spice_lut_testbench is enabled."
"dff_tb", "Contain all the testbenches for FFs. This folder is created only when option print_spice_dff_testbench is enabled."
"grid_tb", "Contain all the testbenches for logic blocks (grid-level testbenches). This folder is created only when option print_spice_grid_testbench is enabled."
"pb_mux_tb", "Contain the testbenches for the multiplexers inside logic blocks. This folder is created only when option print_spice_pbmux_test-bench is enabled."
"cb_mux_tb", "Contain all the testbenches for the multiplexers inside connection boxes. This folder is created only when option print_spice_cbmux_testbench is enabled."
"sb_mux_tb", "Contain all the testbenches for the multiplexers inside switch blocks. This folder is created only when option print_spice_sbmux_test-bench is enabled."
"top_tb", "Contain the full-chip-level testbench. This folder is created only when option print_spice_top_testbench is enabled."
"results", "An empty folder when created. It stores all the simulation results by running the shell script run_hspice_sim.sh."