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Exemplar: How to infer STARTUP, using the infer_gsr command.
Using Exemplar Leonardo how can I get the STARTUP block into my design
to utilize the dedicated resources on the Xilinx chips?
1) One way is to instantiate the STARTUP block the bring the signal going to
the GSR pin on the STARTUP out to a port. Then in the HDL code describe
an asynchronous set/reset signal with the same name as the STARTUP's
GSR port name.
2) The Exemplar tools can also infer the STARTUP component by using the
infer_gsr command. Every flip-flop in the design must have a common
asynchronous set/reset signal in order for STARTUP to be inferred. This
coding technique will also allow more accruate RTL simulation by
matching up with expected results. You can still have an additional
asynchronous reset, such as to set/reset one flip-flop, while still
having synthesis infer the STARTUP by following the above coding style.
This will result in the GSR from the dedicated resources being OR'd
with the additional reset using a dedicated OR, (NOT an additional LUT).
To utilize inferring of STARTUP do the following:
a) If you are using the GUI make sure the "Assign GSR" box is set to
in the auto in the Technology tab. You can also use the "Manual"
check box and name the signal which you desire to be active high
set or reset.
b) If you are using a Tcl script use the infer_gsr command or use the
global_sr command to assign an active high signal name as global set or