Static High Impedance Node Check (static_highz)
Spectre Syntax
title static_highz node=[n1 n2 ...] vnth=<value> vpth=<value> <inst=[inst1 inst2...]> <xinst=[xinst1 xinst2...]> <subckt=[subckt1 subckt2....]> <xsubckt=[xsubckt1 xsubckt2....]> <fanout=all|gate|bulk> pwl_time=<value> <depth=n> error_limit=<value> <rpt_node=no|all|top|selected>
SPICE Syntax
.cck title static_highz node=[n1 n2 ...] vnth=<value> vpth=<value> <inst=[inst1 inst2...]> <xinst=[xinst1 xinst2...]> <subckt=[subckt1 subckt2....]> <xsubckt=[xsubckt1 xsubckt2....]> <fanout=all|gate|bulk> pwl_time=<value> <depth=n> error_limit=<value> <rpt_node=no|all|top|selected>
Description
Reports nodes without a possible conducting path to a DC power supply or ground. The results are written to a file with the extension static.xml, which can be viewed with a Web browser.
Arguments
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node
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Nodes to be checked for the highz state. Default is none.
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vnth
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NMOS threshold voltage. This value is used to calculate the voltage drop across a NMOS channel during voltage propagation (the default value is 0.5 v).
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vpth
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PMOS threshold voltage. This value is used to calculate the voltage drop across a PMOS channel during voltage propagation (the default value is -0.4 v).
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inst
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Subcircuit instances to which the circuit check is applied. Default is inst=*
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xinst
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Subcircuit instances that are excluded from the circuit check. Default is none.
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subckt
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Instances of the specified subcircuit to which the circuit checks are applied. Default is subckt=*.
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xsubckt
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Instances of the specified subcircuit which are excluded from the circuit checks. Default is none.
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fanout
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Fanout setting to filter node with specified connection. Possible values are all, gate, and bulk. Default is all.
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pwl_time
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If specified, all pwl sources are considered constant sources with a value equal to the voltage of the pwl source at pwl_time. Default is infinity.
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depth
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Hierarchy level (from top level) to be checked. depth=3 reports errors on top level plus 3 sublevels. Default is 8.
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rpt_node
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Report node voltages. If set to no, no node voltages are reported. If set to all, all node voltages are reported. If set to top, voltages of only the top-level nodes are reported. If set to selected, voltages of only the specified nodes are reported. The report is written to a file named <netlist_name>.<check_name>.nv.
Possible values are no, all, top, and selected. The default value is no.
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error_limit
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Maximum number of errors to be reported. Default is 10000.
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Example
Spectre Syntax
static_hz1 static_highz node=["*"]
SPICE Syntax
static_hz1 static_highz node=["*"]
The above command will report all possible high impedance nodes. The following is an example of the report that is displayed in the Web browser:
Related Topics
Static Checks
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