1DR(4)                      Kernel Interfaces Manual                      DR(4)
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NAME

6       dr - DR11-W general purpose interface driver
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SYNOPSIS

9       /sys/conf/SYSTEM:
10            NDR  dr11-w_units   # DR11-W
11
12       /etc/dtab:
13            #Name Unit# Addr   Vector Br Handler(s)      # Comments
14            dr    ?     172410 124    5  drintr          # dr11-w (b-bus emulator)
15            dr    ?     172430 130    5  drintr          # dr11-w (gc-bus emulator)
16            dr    ?     172450 134    5  drintr          # dr11-w (em-2 interface)
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18       major device number(s):
19            raw: 12
20       minor device encoding:
21            bits 0007 specify DR unit
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DESCRIPTION

24       The Digital Equipment 1981-82 Peripherals Handbook states the following
25       about the DR11-W:
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27              The The DR11-W is a general purpose, direct memory access  (DMA)
28              interface  to the PDP-11 UNIBUS or VAX UNIBUS.  The DR11-W moves
29              data directly between memory and the  UNIBUS  to  and  from  the
30              user's peripheral.
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32              It features:
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34              ·      Word or byte transfers.
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36              ·      Programmed or direct memory access (DMA) block transfers.
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38              ·      Burst data transfers.
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40              ·      User-controlled transfer rates up to memory speed.
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42              The  DR11-W is a 53-line direct memory access (DMA) interface to
43              the PDP-11 UNIBUS or VAX UBA, which allows the user  to  control
44              data transfers between the host processor and a peripheral.  The
45              DR11-W has 32 data lines (for transferring 16-bit parallel data)
46              and 21 control lines (for transferring control and status infor‐
47              mation.
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49              When used as an interprocessor buffer (IPB), the  DR11-W  allows
50              data  transfers between two processors.  Interprocessor communi‐
51              cation is accomplished by attaching one DR11-W to each processor
52              UNIBUS or UBA and then cabling the two DR11-Ws together.
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54       There.  Now you know as much about it as I do.
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56       A number of ioctl(2) calls apply to the dr devices, and have the form
57              #include <pdpuba/drreg.h>
58              ioctl(fildes, code, arg)
59              int *arg;
60       The applicable codes are:
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62       DRGTTY            Get DR11-W status.
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64       DRSTTY            Set flags and function.
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66       DRSFUN            Set function.
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68       DRSFLAG           Set flags.
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70       DRGCSR            Get CSR and WCR.
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72       DRSSIG            Set signal for ATTN interrupt.
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74       DRESET            Reset DR11-W interface.
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76       DRSTIME           Set timeout.
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78       DRCTIME           Set timeout inactive.
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80       DROUTPUT          Put word in output data register.
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82       DRINPUT           Get word from input data register.
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84       DRITIME           Don't ignore errors on timeout.
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FILES

87       /dev/dr[0-7]        device special files
88       /dev/MAKEDEV        script to create special files
89       /dev/MAKEDEV.local  script to localize special files
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SEE ALSO

92       dtab(5), autoconfig(8)
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DIAGNOSTICS

95       dr%d: error csr=%b, eir=%b
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97       dr%d: timeout error
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BUGS

100       This interface is only available under 2.9BSD and 2.11BSD.  No documen‐
101       tation exists on how to use it.
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1053rd Berkeley Distribution      January 27, 1996                          DR(4)