cpac(7)                        DG/UX R4.11MU05                       cpac(7)


NAME
       cpac - Computone PCI bus asynchronous controller

SYNOPSIS
       cpac(parent-bus[,pci-device-num[,pci-function-num[,port]]])

DESCRIPTION
       The cpac device name specifies a Computone asynchronous terminal I/O
       controller that connects to a number of terminal lines.  The
       Computone asynchronous controllers are actually processors that
       perform I/O processing according to the tty modes in effect for each
       line.  It is necessary for the controller-resident code image to be
       downloaded, using tcload(1M), into the controller's memory before its
       lines can be used.  This is normally handled by system setup
       procedures, but if the board has been reset the system administrator
       may need to directly invoke this command.

       To configure cpac devices, you must add one or more device name
       entries to the DG/UX system configuration file, using the form
       described in the synopsis above.  The parameters in a cpac device
       name have the following meanings:

       ·   The parent-bus parameter is itself a device name, representing
           the PCI bus device to which the controller is attached (e.g.
           pci(0)).  There is no default value for this parameter; it must
           always be explicitly specified.

       ·   The pci-device-num parameter is a hexadecimal number in the range
           0 through 1F; it represents the PCI device number ("slot number")
           used by the cpac controller.  The default value for pci-device-
           num is 0.

       ·   The pci-function-num parameter is a hexadecimal number in the
           range 0 through 7 which represents the PCI function number used
           by the controller within pci-device-num.  The default value for
           pci-device-num is 0.

       ·   The port parameter is a hexadecimal number which identifies a
           particular asynchronous serial port on a cpac device.  The first
           port on the device uses port number 1, the second uses 2, and so
           on.  The default value for port is the special value 0, which
           identifies the cpac controller itself, distinct from any of the
           lines on it.

       These ports present the standard terminal interface described in
       termio(7), except for the following unsupported features:

       ·   The stty options for hardware flow control via carrier detect
           (cdxon) and isochronous hardware flow control (isxoff)

       ·   The CDXON or ISXOFF flags of the x_hflag field of the termiox
           structure

EXAMPLES
       The following entry configures a cpac controller in the PCI slot that
       uses PCI device number 0xB on the primary PC PCI host bridge:

            cpac(pci(0),B,0)


       The following entry configures a cpac controller in slot 3 of the
       secondary PCI host bridge:

            cpac(pci(1),3)


       For more information about DG/UX device configuration, refer to
       "Writing a Device Driver" in Programming in the DG/UX Kernel
       Environment.

FILES
       When a standard cpac controller is configured, it creates a
       character-special device node for each port, using the associated
       pathname:

           /dev/async/line/cpac(parent-bus,pci-device-num,pci-function-num,port)


       An additional node is created to refer to the entire cpac controller
       itself, using the associated pathname:

           /dev/async/ctrl/cpac(parent-bus,pci-device-num,pci_function-num)


       The chk.devlink command is responsible for creating and maintaining
       links to each port device node, with a pathname of the form
       /dev/tty[0-9]* (see chk.devlink(1M) and devlinktab(4M)).

SEE ALSO
       tcload(1M), chk.devlink(1M), devlinktab(4M), system(4), pci_bus(7),
       termio(7), termiox(7).


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