dhq man page on Ultrix

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dhq(4)									dhq(4)

       dhq - DHQ11 communications interface

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

       A DHQ11 provides eight communication lines with modem control.

       Each  line  attached to the DHQ11 communications multiplexer behaves as
       described in Input and output for each line can be set independently to
       run at any of 16 speeds.	 See for the coding.

       Bit  i  of flags can be specified for a DHQ11 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 would cause the third line to be treated in this  way.
       The driver operates under the control of the driver.

       dhu%d %d: DMA ERROR
       The indicated channel failed to transfer DMA data within 21.3 microsec‐
       onds of the bus request being acknowledged or there was a memory parity

       dhu%d: DIAG. FAILURE
       The DHQ11 failed the diagnostics that run at initialization time.

       dhu%d: recv. 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.   Interrupts  are disabled, and the system then prints a mes‐
       sage on the console.

       dhu%d: DHU HARDWARE ERROR.  TX.DMA.START failed
       The dhq 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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