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#
# We need create IPI Block Design and name it, say "top"
#
create_bd_design "top"
#
# Lets make a binary counter with width say 32, clocked from Input port named CLK
#
startgroup
create_bd_cell -type ip -vlnv xilinx.com:ip:c_counter_binary:12.0 my_counter
set_property -dict [list CONFIG.Output_Width {32}] [get_bd_cells my_counter]
create_bd_port -dir I -type clk CLK
connect_bd_net [get_bd_pins /my_counter/CLK] [get_bd_ports CLK]
startgroup
#
# We want to access single bit of the counter and connect it to LED to make it blink
# So we create a "slicer" it has default width of 32 that matches our counter width
# We select bits 23:23 as single bit wide output
#
startgroup
create_bd_cell -type ip -vlnv xilinx.com:ip:xlslice:1.0 my_bitselector
set_property -dict [list CONFIG.DIN_TO {23} CONFIG.DIN_FROM {23}] [get_bd_cells my_bitselector]
endgroup
#
# Now we connect the "bit slicer" to our counter
#
connect_bd_net [get_bd_pins my_bitselector/Din] [get_bd_pins my_counter/Q]
#
# The following is optional, but it makes the 1 bit vector from bit slicer
# to be available as single signal (not as vector), so it is nicer name 
# in XDFXDC file to connect to single LED as LED not as LED[0]
# We create a dummy logic function and immediatlyimmediately set itsits 
# input vector inputwidth to 1 (0:0)
#

startgroup
create_bd_cell -type ip -vlnv xilinx.com:ip:util_reduced_logic:1.0 my_vector_to_signal
set_property -dict [list CONFIG.C_SIZE {1}] [get_bd_cells my_vector_to_signal]
endgroup
#
# Now we connect it to the output of the slicer that delivers our blinking signal
# As vector of width 1
#
connect_bd_net [get_bd_pins my_vector_to_signal/Op1] [get_bd_pins my_bitselector/Dout]
#
# Now we create a output port named LED and connect it
#
startgroup
create_bd_port -dir O LED
connect_bd_net [get_bd_pins /my_vector_to_signal/Res] [get_bd_ports LED]
endgroup
#
# We are done, lets regenerate the layout
#
regenerate_bd_layout
#
# We are done, LED Blinky design is created, and this TCL magic would
# Recreate the same design on any other PC 
# (if the builtin IP core versions used here are available)
#

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LED blink with TCL magic. There are actually 3 LED's blinking, the "Vivado TCL" LED is the red LED at the far top of TE0711 TE0710.

At close bottom edge of TE0711 TE0710 are red and green LED's, the green LED is also blinking (controlled by system controller on TE0711TE0710).

One LED on the TE0702 factory test baseboard is also blinking controlled by the base board controller.

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