Provided by: alliance_5.0-20120515-6_amd64 bug

NAME

       spi - Alliance parser and driver for Spice netlist.

FILES

       The  description of a netlist foo must be contained  in a .SUBCKT of a file named foo.spi.
       This description can include others .SUBCKT that  must  be  in  the  same  file  or  files
       included with the command .INCLUDE in the source file.

       Recognized elements are :

              Resistances

              Capacitances

              Instances

              MOS  transistors.

       Others elements are not considered.

       Nodes  can be either numbered or nameed. It's possible to assign a name to a node which is
       designated by a number with the directive

       * NET number = name

       in the .SUBCKT. The word NET can be  replaced  by  positioning  the  environment  variable
       MBK_SPI_NETNAME. Names are used to named the signals and the connectors in the LOFIG.

       On  the  .SUBCKT  interface,  nodes of the same name followed by a period and a number are
       considered to be on the net, even if no connected in the circuit. For example :

               .SUBCKT nand2 in out out.1 out.2 vss vdd out.3

       The nodes out, out.1, out.2 and out.3 are considered to be the same signal of the Alliance
       LOFIG.  This  feature  can be turned off if the environment variable MBK_SPI_MERGE is set,
       and the period can  be  replaced  by  another  character  with  the  environment  variable
       MBK_SPI_SEPAR.

       No  particular  information  is needed to build a LOFIG from a .SUBCKT, the parser rebuild
       all signals, even they contains many  resistances  and  capacitances.  If  names  are  not
       provided, the parser will create then in order to provide a valid lofig.

DRIVER

       The driver creates a Spice netlist of the LOFIG passed as a parameter.  The file contain a
       single .SUBCKT representing the figure  and  commands  .INCLUDE  with  name  of  instances
       contained  in  the  LOFIG.   Nodes  are number named with the directive * NET, or strings,
       depending on MBK_SPI_NAMEDNODES. A comment at the beginning of  the  file  represents  the
       interface of the LOFIG. This comment is not used by the parser.

       Environment variable considered are

              MBK_SPI_MODEL

              MBK_SPI_NETNAME

              MBK_SPI_NAMEDNODES

PARSER

       The  parser  load  all  .SUBCKT  in  memory, even those in files included with the command
       .INCLUDE until the required LOFIG is loaded. For each .SUBCKT loaded, the parser build the
       equipotentials  with  both  nodes  of  resistances  on  the  same  net  and  both nodes of
       capacitances on differents net unless more information is given. The RCN library  is  used
       to handle resistances and capacitances.

       As  the  LOWIRE can contain a resistance and a capacitance, the parser groups a resistance
       and two capacitances in a single LOWIRE if the following conditions are met :

              The resistance is named 'name' and the  two  capacitances  are  named  'name1'  and
              'name2'

              The two capacitances must have the same value

              The two capacitances must be between the net of the resistance and VSS.

       The driver supports this feature.

       Environment variable considered are

              MBK_SPI_MODEL

              MBK_SPI_NETNAME

              MBK_SPI_SEPAR

              MBK_SPI_MERGE

              MBK_SPI_FILE

              MBK_SPI_VERBOSE

              MBK_SPI_ONE_NODE_NORC

              MBK_SPI_NO_AFF_UNK

ENVIRONMENT VARIABLES

       MBK_SPI_MODEL

       File name where transistors models are described. Syntax for file is :
              MODELNAME N|P [FAST] [HVIO]
       Blank lines are allowed, and line comment begin with a '#'.

       MBK_SPI_NETNAME

       Comment used to name the nodes. Default is NET.

       MBK_SPI_SEPAR

       Character  used to separate a name from a node number on the interface of the .SUBCKT. The
       parser considers nodes of the same name to be on the same equipotential. Default is '.'.

       MBK_SPI_NOMERGE

       If this variable is set, the parser does not merge interface nodes of the same  name,  but
       different number, on the same equipotential.

       MBK_SPI_FILE

       If this variable is set, the name of the files opened are displayed on the error output.

       MBK_SPI_VERBOSE

       If this variable is set, display debug various information on the error output.

       MBK_SPI_ONE_NODE_NORC

       If this variable is set, an RCN view is not created for a net containing only one node.

       MBK_SPI_NO_AFF_UNK

       Default  behaviour  of Spice parser is to display an error message when an unknown element
       is read in the input file. Setting this variable prevent this display. Usefull  when  file
       contain command for Spice simulator.

       MBK_SPI_NAMEDNODES

       When  this  environment  variable is set, spice netlist's nodes are named using one of the
       following convention, if signal name is set or no, or if signal has an RCN view :

              "SIGNAL NAME" $MBK_SEPAR "RCN NODE"

              "SIGNAL NAME"

              SIG "SIGNAL INDEX" $MBK_SEPAR "RCN NODE"

              SIG "SIGNAL INDEX"

       $MBK_SEPAR is a single character defined by a environment variable with the same name.

EXAMPLE

       This is an example of a file generated by the Spice driver.

        * Spice description of gxor
        * Spice driver version 700
        * Date ( dd/mm/yyyy hh:mm:ss ): 29/03/1999 at 17:43:53

        * INTERF a b s vdd vdd vdd vdd vss vss vss vss

        .INCLUDE mx2_y.spi
        .INCLUDE ndrvp_y.spi

        .subckt gxor 24 42 49 52 53 61 54 63 64 71 72
        * NET 1 = implicit
        * NET 4 = auxsc1
        * NET 13 = auxsc3
        * NET 26 = a
        * NET 40 = b
        * NET 49 = s
        * NET 52 = vdd
        * NET 65 = vss
        xauxsc1 64 65 53 55 33 35 2 8 ndrvp_y
        xs 66 70 56 60 48 50 11 21 5 9 34 36 38 45 mx2_y
        xauxsc3 70 71 60 61 41 46 18 22 ndrvp_y
        R2_1 4 7 6
        C2_11 4 63 6.9e-15
        C2_12 7 63 6.9e-15
        R2_2 3 2 0.15
        C2_21 3 63 7.2e-16

       [----- CUT -----]

        C4_51 69 63 6.525e-15
        C4_52 72 63 6.525e-15
        R4_6 68 69 0.001
        R4_7 68 67 0.001
        .ends gxor

SEE ALSO

       Alliance(1) MBK(1) Al(1) RCN(1) MBK_SEPAR(1)

AUTHOR

       Gregoire AVOT.  Gregoire.AVOT@lip6.fr