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RN(4)			    BSD Programmer's Manual			 RN(4)

NAME
     rn - SDL Communications RISCom/N1 high-speed synchronous interface

SYNOPSIS
     rn0 at isa? port 0x220 iomem 0xe0000 iosiz 65536

DESCRIPTION
     The rn interface provides a point-to-point bit-synchronous serial connec-
     tion with speeds up to 4 Mb/s using HDLC frame format.  It uses a switch-
     selectable block of 8 I/O ports in the range 0x200 through 0x3f0.	The
     block must be aligned on a 16 port boundary.  The jumper-selectable in-
     terrupt level is detected at autoconfiguration time or alternatively can
     be specified in the system configuration file.  Supported IRQs are: 2(9),
     3, 4, 5, 10, 11, 12 and 15.  The RISCom/N1 board requires a 16, 32 or 64
     Kb I/O memory window aligned at a 16 KB boundary (the base address and
     size should be specified in the system configuration file).  The
     RISCom/N1 board should be installed in a 16-bit slot.

     Supported synchronous serial encapsulation protocols are described in
     p2p(4).

DIAGNOSTICS
     The following diagnostics may be printed during autoconfiguration:

     rn%d: illegal base address %x
     Invalid port specification in kernel config file.

     rn%d: illegal memory window size %d
     Invalid I/O memory window size in kernel config file.

     rn%d: non-aligned memory window (at %x)
     Invalid I/O memory base address in kernel config file.

     rn%d: can't alloc memory
     The probe routine cannot allocate temporary memory.  Should never happen.

     rn%d: illegal IRQ %d
     Invalid IRQ specification in kernel config file.

     rn%d: init failed
     Initialization sequence failed - hardware problem.

     rn%d: memory test failed
     Error in on-board memory; this is a hardware problem.

     rn%d: no response
     Network controller not responding; this is a hardware problem.

     rn%d: lost intr
     Lost interrupt. This is a warning.

     rn%d: invalid status %x
     Invalid status code received from network controller; most likely cause
     is incorrect ISA bus timing.

     rn%d: tx queue botched (0x%x)
     Buffer list corrupted due to data error in I/O memory; most likely cause
     is incorrect ISA bus timing.

     rn%d: status table overflow
     Network controller indicates status table overflow; the problem may be

     caused by dribble on interface control leads.

     rn%d: cannot set modes
     Loading link parameters in the network controller failed.	This is a
     hardware problem.

SEE ALSO
     intro(4),	inet(4),  p2p(4),  ifconfig(8)

BSDI BSD/OS			 March 1, 1993				     2

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