cxy man page on Ultrix

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cxy(4)									cxy(4)

       cxy - CXY08 communications interface

       device dhu0 at uba0 csr 0160440 flags 0x?? vector dhurint dhuxint

       A  CXY08 provides eight communication lines with modem control adequate
       for UNIX dialup use. The device behaves and looks just like a DHV11 and
       is  specified  in  the  configuration  line the same as a DHV11 device.
       Each line attached to the CXY08	communications	interface  behaves  as
       described  in  and  can	be set to run at any of 16 speeds. See for the

       Bit i of flags can be specified for a device to say that a line is  not
       properly	 connected  and	 that  the line should be treated as hardwired
       with carrier always present.  Thus, specifying flags 0x04 in the speciā€
       fication of would cause line tty02 to be treated in this way.

       The  driver  normally  interrupts  on  each  input  character.  The and
       devices operate under the control of the driver.

       dhu%d: receive fifo overflow
       The character input fifo overflowed before it could be serviced.	  This
       can happen if a hard error occurs when the CPU is running with elevated
       priority, as the system then prints  a  message	on  the	 console  with
       interrupts  disabled.  This can cause a few input characters to be lost
       to users.  It is not serious.

       dhu%d:%d DMA ERROR
       A DMA transfer error has occurred.  The unit number and line number are
       printed.	  This means that the channel indicated has failed to transfer
       DMA data within 10.7 microseconds of the bus request being acknowledged
       or  that	 there	is a memory parity error.  This may cause a few output
       characters to be lost.

       dhu%d: DIAG. FAILURE
       This indicates that the internal diagnostics have detected an error.

       dhu%d: DHU HARDWARE ERROR.  TX.DMA.START failed
       The failed to clear the start bit.  Normally, this is cleared to signal
       that a DMA transfer has completed.


See Also
       tty(4), MAKEDEV(8)


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