dhv man page on Ultrix

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dhv(4)									dhv(4)

       dhv - DHV11 communications interface

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

       A  DHV11 provides eight communication lines with partial modem control,
       adequate for UNIX dialup use.  Each line attached to the DHV11 communi‚Äź
       cations	interface behaves as described in and can be set to run at any
       of 16 speeds.  See for the encoding.

       Bit i of flags may be specified for a DHV 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
       specification of dhu0 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 will then print 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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