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<h3 id='___get_drivers'>get_drivers</h3>
<pre>Get the drivers of a net or pin (LLM: drivers)
<b>Usage:</b> @drivers = get_drivers($point, @options);
$point: net name or pin name, 'n12345' or 'U12345/A1'
@options:
-nonbuf: Trace the drivers until none buffer
@drivers: An array of the drivers, if the point is floating, @drivers is empty,
if the point has multi-drivers, @drivers has more than one items.
For each item in @drivers
Index 0: instance, it is empty if the driver is port
Index 1: pin or port, if the driver is port, return port
Index 2: string "pin" or "port" depending on the driver is port or leaf cell
Index 3: indicating drive path inverted or not
If 'nonbuf' is present, the last item in @drivers is the non-buffer driver
So '$nonbuf = pop @drivers' can get the non-buffer driver
<b>Note:</b>
Use 'get_driver' instead if the net has only one driver and 'nonbuf' option is not used
<b>Examples:</b>
#1. Get drivers of a net
@drivers = get_drivers("net12345");
@drivers has content of (["U1247", "Y", "pin"]);
#2. 'port_abc' is input port
@drivers = get_drivers("port_abc");
@drivers has content of (["", "port_abc", "port"]);
#3. Buffers in the path
@drivers = get_drivers("state_reg/CK", "-nonbuf");
@drivers has content of
(
["buf_inst0", "Y", "pin"],
["inv_inst1", "Y", "pin"],
["and_inst2", "Y", "pin"]
)
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