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CY(4)                     NetBSD Programmer's Manual                     CY(4)


NAME

     cy - Cyclades Cyclom-{4, 8, 16, 32}Y asynchronous comms board device
     driver


SYNOPSIS

     cy0 at isa? iomem 0xd4000 irq 12
     cy* at pci? dev ? function ?


DESCRIPTION

     This driver provides an interface to Cyclades Cyclom-4Y, Cyclom-8Y, Cy-
     clom-16Y, and Cyclom-32Y asynchronous multiport serial boards.  These
     boards are based around Cirrus Logic CD1400 communication controllers.

     The device minor numbers for this driver are encoded as follows:

         d c c p p p p p     - bits in the minor device number

         bits    meaning
         ----    -------
         ppppp   physical serial line (i.e. port) to use:
                     0-3 on Cyclom-4Y
                     0-7 on Cyclom-8Y
                     0-15 on Cyclom-16Y
                     0-31 on Cyclom-32Y

         cc      card unit number; note this limits the driver to
                 four cards per system

         d       set to use as a dial-out line


FLOW CONTROL

     The cy driver makes use of the CD1400's automatic CTS flow control.  In
     addition, the CD1400's automatic input flow control can be used.  This
     requires the kernel configuration option CY_HW_RTS and a special cable
     that exchanges the RTS and DTR lines.


DIAGNOSTICS

     cy%d: port %d: can't allocate tty  There is not enough memory to allocate
     tty data structures.

     cy%d: can't allocate input buffer  There is not enough memory to allocate
     the data input buffer.

     Additional debugging output can be enable with the kernel configuration
     option CY_DEBUG. Diagnostic counters may be enabled with the kernel con-
     figuration option CY_DEBUG1.


BUGS

     Support for the Cyclom-32Y has not been tested.


AUTHOR

     The cy driver was written by Timmo Rossi.


SEE ALSO

     termios(4),  tty(4)

NetBSD                         November 10, 1997                             1