Digital PDFs

ED-222970-20

2000

4 pages

Original

1.3MB

Document:	DMF32 Multifunction Communications Controller
Order Number:	ED-222970-20
Revision:	0
Pages:	4
Original Filename:	ED-222970-20_DMF32MultifunctionCommunicationsControllerDataSheet.pdf

OCR Text

DMF32 MUL Tl FUNCTION COMMUNICATIONS
CONTROLLER
DATA SHEET

The DMF32 is an intelligent, highperformance, communications controller
that enables a combination of modems and
terminals to communicate with the VAX11 /730™ computer system.
The DMF32 controller contains an eight line
asynchronous interface for operation with
modems and terminals, a single line
synchronous interface for connection to a
network communication facility, and a
parallel interface for operating a line printer
or a user developed device.
The use of the Direct Memory Access
(OMA) mode and SILO's (first-in, first-out
buffers) in the controller permit fast data
transfers and reduced interrupt overhead of
the Central Processor Unit (CPU).
The DMF32 operation is supported by the
VAX/VMS™ (Virtual Memory System)
version 3 software.

HIGHLIGHTS
• Concurrent operation of three controllers contained on
one hex height module
• Two of the eight asynchronous channels provide full modem control and individually selectable transmit and receive baud rates.
• Six asynchronous channels for local terminal communication with no modem controls.
• One DMA synchronous channel with low level support
for byte oriented protocols (DDCMP) and bit oriented
protocols.
• General Purpose DMA or SILO mode parallel interface
for connection to a user specific device or intelligent
DMA line printer controller.

DESCRIPTION
The DMF32 Multifunction Communications Controller is a
UNIBUS™ compatible option that enables three Input/Output (1/0) devices to operate concurrently with the
VAX-11 /730 computer system . The controller contains an
eight channel asynchronous multiplexer interface, a single
channel synchronous line interface, and a combination
general purpose parallel interface which operates with either a line printer or a user device.
The asynchronous line interface provides transmit and receive lines for eight asynchronous devices. Two of these
channels include full modem control with individually selectable baud rates for the transmit and receive lines. The
remaining six channels are available for local video terminals such as the VT100™ series.
The synchronous line interface can be connected to a
network communication facility through an external modem. In a DECnetfM communication network, the synchronous line may operate either as a point-to-point station or
as a multipoint tributary station.
The line printer interface provides data and control signals
to a high speed line printer. The printing speed of the
device can be up to 1200 lines per minute. When the line
printer interface is connected for operation the general
purpose user's interface cannot be used.
DECnet, UNIBUS, VAX, VMS, and VT are trademarks of
Digital Equipment Corporation.

DMF32 CDNTRDLLER

EIGHT LINE
ASY NCH RDNDUS
MULTIPLEXER
VAX · l 1/730
CEN T RAL
PRDCESSDR

.'>

EXTERNAL MODEM !LINE 1)
LOCAL
TERMINALS !LINES 2-7)

"'
~

::)

' EXTERNAL MODEM !LINE 01

EXTERNAL MODEM
TD N ETWORK
CDMMUNICAT IDNS

SYNCH RDNDUS
LINE IN T ERFACE

LINE PRINTER
DR
US ER DEVICE
PARALLEL
INTERFACE

LP32 LIN E PRINTER
DR USER 'S DEVICE
!OUTPUT)
USER'S DEVICE
!IN PUT)

The general purpose interface transfers 16-bits of data
between a user specific device and the VAX-11 /730 system. The signal levels are TTL compatible.
The maximum throughput rate of the interfaces contained
on the DMF32 controller is dependent on the applications
programs and on the number of modems and devices
connected to the controller.
Software support is included in the VAX/VMS version V3.0
operating system and on DECnet VAX version 3.0 software. The 16-bit parallel interface is supported only with
sample driver documentation since the user device driver
is designed for specific customer applications.

Asynchronous Multiplexer Interface
The asynchronous multiplexer interface consists of eight
channels. Each channel has a transmit and receive line for
communication with a modem or terminal. The transmit
and receive lines can be programmed to operate at one of
16 baud rates of from 50 bits per second to 19.2 kbits per
second. Two of the channels (lines O and 1) provide full
modem control and split speed capability to allow the
transmit and receive baud rates to be independently selected.
The baud rates that can be selected for each serial line are
listed as follows:
Desired
Baud Rate

Actual
Baud Rate

Deviation
%

50
75
110
134.50
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200

50
75
110
134.52
150
300
600
1200
1800
2005
2400
3600
4800
7200
9600
19800

0.0
0.0
0.0
0.0166
0.0
0.0
0.0
0.0
0.0
0.253
0.0
0.0
0.0
0.0
0.0
3.125

Transfers can be initiated by program control for the
Direct Memory Access (DMA) mode or for the SILO mode.
During the DMA mode of operation, the transmit line receives characters for transmission from the main memory
of the CPU as specified by the buffer address and the

character count. This allows blocks of data to be transferred without processor intervention at high data transfer
rates.
During the SILO mode of operation, each transmit line
buffer can store up to 32 characters for transmisson .
These characters are loaded into the transmit SILO buffer
under program control. During reception, a 48 character
receive SILO buffer is shared by all eight of the receive
lines. Program interrupts are generated either after 16
characters have been entered into the SILO buffer or after
a program selectable time delay has occurred after the
SILO buffer has become non-empty. A zero time delay
indicates that an interrupt is generated as soon as the
buffer becomes non-empty.
One of these two modes of output is dynamically selected
by the VMS terminal driver, depending on the number of
characters to be transmitted, so as to reduce the CPU
overhead.
Six of the asynchronous channels are available for Data
Terminal Equipment (DTE) such as VT100 video display
terminals or similar devices. These six channels do not
provide modem control. The remaining two modem channels can be connected to either video display terminals or
to Data Communication Equipment (DCE) such as Digital
DF03 data sets or equivalent modems.
The asynchronous channels are compatible with EIA RS232-C, RS-423 standards and with CCITT V.24 and V.28
standards.

Synchronous Line Interface
The synchronous line interface is a full duplex, DMA, single transmit and receive channel that provides full modem
control. The DMA transfers are double buffered with both
the transmitter and receiver having two sets of byte count
and buffer address registers. The double buffering enables a high message throughput.
Low level communication protocol support is contained in
the microcode of the DMF32 controller and includes
Digital Data Communications Message Protocol (DDCMP),
Synchronous Data Link Control (SDLC), High Level Data
Link Control (HDLC) and a general purpose byte oriented
protocol (GENBYTE).
The microcode frames the messages, generates and
checks the Cyclic Redundancy Check (CRC) and transfers
the messages by DMA operations to and from the main
memory of the CPU. All message acknowledgement and
high level network functions are controlled by the host
level software.
The synchronous channels are compatible with EIA RS232-C, RS-423 and CCITT V.24 and V.28 standards.
The synchronous line interface is supported by the
VAX/VMS Version 3.0 software as a DDCMP DECnet device.

Line Printer or User Device Interface
The DMF32 option includes an interface that can be connected to a line printer terminal or to a user developed
device. The user device interface enables parallel data
transfers in a half duplex DMA mode of operation. It also
permits data transfers through a 32-word SILO register in

the half duplex SILO mode of operation. The DMA mode
provides double buffering to enhance the controller operation.
The line printer section of the DMF32 controller operates
with high speed line priners such as the Digital LP32 series
or equivalent printers. The DMF32 microcode includes low
level printer formatting functions and the printer operation
is supported by the VAX/VMS V3.0 operating system software.

The distribution panel attaches to the 48.26 cm (19.0 in)
mounting frame supplied with the DMF32-AB option. The
mounting frame can be installed at the rear of the expansion cabinet. The three internal cables connect the module
to the distribution panel connectors.

DMF32 MULT IFUNCTION CO MMUN I CATI ONS
CONTROLLER
UJ

:::>

The device interface allows a user to connect special 1/0
devices to the DMF32 controller. Separate input and
output ports are included to enable 16-bit parallel data
transfers to and from the device. The data and control
signals are TTL compatible. The device interface may be
operated in a compatibility mode where it is functionally
similar to a DR11-C parallel interface.

PHYSICAL CONFIGURATION
The DMF32 controller is available in two optional configurations depending on the VAX system. The option designations for the VAX systems are as follows.
Option
DMF32-AA
DMF32-AB

System
VAX-11 /730 (included in CPU Cabinet)
VAX-11 /730 Expander Cabinet Option

The DMF32 option consists of a standard length, hex height module, three internal flat cables, a distribution panel and panel mounting frame. The module can be inserted into a Small Peripheral Controller (SPC) slot of a
standard UNIBUS System Unit provided that adequate
power and cooling are available .

MICROCONTAOLLER MO DU LE
(M8396)

LINE
PRI NTER OR USER'S
DEVICE !O UTPUT )

USER 'S DEV ICE
(IN PUT )

" CABLES NOT
SU PP LIED WITH
OPTION

ASYNC LIN ES
TO MODEMS

ASYNC LINES
TO TERMINALS

SYNC LINE
TO MODEM
(NETWORK
FAC I LITY )

Distribution Panel
The distribution panel contains nine 25-pin EIA compatible
connectors for the cables to the DTE or DCE equipment. It
also includes two 37-pin EIA connectors for the TTL parallel data devices which are the line printer or general purpose user device. Three flat cables are supplied with the
DMF32 option and connect the microprocessor module to
the distribution panel. The user device cables, except for
the cable connecting the parallel interface to the user's
device, are available in various lengths from the Digital
Accessories and Supplies Group.

SPECIFICATIONS
Power Requirements
Microcontroller
Module (M8396)

Performance Characteristics
Asynchronous Line
Multiplexer
Operating Modes:

full or half duplex

Signal Compatibility:

RS-232-C and RS-423,
CCITT V.28/V.24

Line Baud Rates:

50 bis to 19.2 kb/s
(Lines 0 and 1 are split
speed)

Lines 0 and 1 signals

TX DATA
RX DATA or SEC RX
DATA
RTS, CTS, DSR, CAR
SEC CAR, SEC RTS
DTR, RI , DSRS
USER TX (pin 18)
USER RX (pin 25)

heat dissipation

Physical Size
Microcontroller
module (M8396)

Synchronous Line
Operating Mode:

Panel Mounting
frame

height 13.3 cm (5.25 in.)
length 48.2 cm (19.0 in.)

Device Cables *
Asynchronous Lines
(FCC qualified)

BC22E-10, 25 (16-conductor)
BC22D-10, -25, (26-conductor null modem)

Signal Compatibility:

EIA RS-232C and RS-423
CCITT V.24 and V.28

Line Baud Rates:

19.2 kb/s (max.)

Synchronous line
signals

TX DATA, RX DATA
RTS, CTS, DSR, CAR,
DTR, RI, DSRS,
TX CLK (DCE source)
RX CLK (DCE source)
TX CLK (DTE source)
USER TX (pin 18)
USER RX (pin 25)

LP32-AA, -BA (285/200
lpm)
LP32-EA, -EB(600/445
lpm)
LP32-GA, -GB (1220/905
lpm)

UNIBUS Loading
Microcontroller Module (M8396)

one de load
5.5 ac loads

height (hex):39.7 cm (15.7
in.), length (standard):
30.2 cm (11.9 in.)
height 10.1. cm (4.0 in.)
length 21 .6 cm (8.5 in.)

Synchronous Line

BC22F-10, -25 (25-conductor)

Line Printer
Interface

BC27 A-25 included with
LP32-AA, -BA, -EA, -EB

full or half duplex

Line Printer Options
Printers Available

167 Btu/h (total)

Distribution
panel

TX DATA
RX DATA

Lines 2-7

+5V ±5%, BA
+ 15V ±5%, 0.5A
-15V ±5%, 0.5A

BC27B-25 included with
LP32-GA, -GB
Parallel Interface

Not supplied

* Digital cable types or equivalent type.

Environment
Operating
Temperature

10° to 40°C (50° to 104°F)

Relative Humidity

10 to 90% (no condensati on)

Wet Bulb Temperatu re

28°C (82°F) max.

Dew Point Temperatu re

2°C (36 ° F) min.

Altitude

sea level to 2.4 km (8 kft)

Shipping *
Temperature

-40° ot 66°C (-40 to
151°F)

Relative Humidity

0 t 95% (no condensation)

Altitude

sea level to 9 km (31 kft)

* Unit packaged for shipping

ORDER CODE: ED-22297-20
The information in this document is subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation . Digital Equipment
Corporation assumes no responsibility for any errors which may appear in this document.