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The Source Physical Button: Update Electrical From Physical
This command will update the electrical part of a design from
parameters extracted from the physical part. The command works by
writing a temporary SPICE file from the physical database, then
updating the electrical database from the SPICE file. When the Source Physical button is pressed, a small pop-up appears, which is
similar to the pop-up seen with the Source SPICE command, but
has no text entry area, and has an additional Depth choice menu
which sets the depth into the hierarchy to process. The Go
button initiates the operation.
Node name mapping is turned on after the operation completes. Since a
schematic produced in this way has every node name defined by a
terminal, using the defined names, which correspond to the physical
group numbers, is convenient.
The first three check boxes have similar functions as in the Source SPICE command. The remaining check box enables inclusion of
wire-net capacitors.
- all devs
If set, all devices in the cell will be considered for updating If not
set, only the devices that have names that were set explicitly by the
user (by applying a name property) are updated.
- create
If set, missing devices are created. If not set, only the properties
of existing devices are updated.
- clear
If set, the electrical part of a cell is cleared before updating.
This implies create.
- include wire cap
If set, capacitors that represent routing net capacitance will be
updated, or created if they don't exist and create is set.
These capacitors are given a special name prefix ``C@NET'' which
has significance to Xic, i.e., it identifies them as routing
capacitances. The capacitors are added between the wire nets and
ground. In order for wire capacitance to be computed, the Capacitance keyword must be supplied in the technology file for the
routing layers.
This functionality is also available through the !exset command
available from the prompt line.
Each of the option buttons has a corresponding !set variable.
If the variable is changed while the pop-up is visible, the pop-up
will be updated. Conversely, changing the state of the option buttons
will set or unset the corresponding variables. The pop-up check box
will be checked if the corresponding variable is set, unless the
variable name has a ``No'' prefix, in which case the logic is
reversed. The names of the corresponding variables are given in the
table below.
all devs |
NoExsetAllDevs |
create |
NoExsetCreate |
clear |
ExsetClear |
include wire cap |
ExsetIncludeWireCap |
Next: The Dump Phys Netlist
Up: The Extract Menu: Extraction
Previous: The Source SPICE Button:
Contents
Index
Stephen R. Whiteley
2006-10-23