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<h3 id='___get_driver'>get_driver</h3>
<pre>Get the driver of a net or pin
<b>Usage:</b> @driver = get_driver($point, @options);
$point: net name or pin name, 'n12345' or 'U12345/A1'
@options:
-pin: Return in "inst/pin" format, E.G. "state_reg/Q"
Return an array if '-pin' is not present
-nonbuf: Trace the drivers until none buffer
@driver: The driver in array format, if '-pin' is not present.
If the point is floating, @driver is empty,
$driver[0]: Driver instance name. It is empty if the driver is port
$driver[1]: Driver pin or port name. If the driver is a port, it is the port name
$driver[2]: Driver type. It is string "pin" or "port" depending on the driver is port or leaf cell
$driver[3]: Driver phase. It is valid when -nonbuf is present,
indicating if the driver path is inverted
0: not inverted 1: inverted
<b>Note:</b>
1. If '-pin' is present, return a scalar, $driver = get_driver("n12345", "-pin");
2. Use 'get_drivers' if there are multiple drivers, the return data has different structure
<b>Examples:</b>
#1. Get driver of a net
@driver = get_driver("net12345");
@driver has content of ("U1247", "Y", "pin");
#2. port_abc is input port
@driver = get_driver("port_abc");
@driver has content of ("", "port_abc", "port");
#3. Return in instance/pin format
$driver = get_driver("net12345", "-pin");
$driver has content of "U1247/Y"
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