Page 1¶

HDLC INTERFACE¶

ND 107300 HDLC INTERFACE (DMA)¶

   __________________________________________
  | ND-100 Bus                              |
  |_________________________________________|
                |
                |  24 bits MPX
                |  Address / Data Bus
                |
   ______________|___________________    ________________________
  | Microprocessor controlled DMA  |  | Line Adapter           |
  | Control Logic                  |  |                         |
  |                                |  |                         |
  |                                |  |                         |
  | Multiprotocol Communication    |  |  TO / from line         |
  | Controller                     |  |                         |
  |________________________________|  |_________________________|

                 |  8 bits Data

ND Norsk Data¶

[Logo: ND Norsk Data]

Page 2¶

HDLC INTERFACE¶

Introduction¶

The ND 107300 HDLC Interface (DMA) offers the hardware necessary to connect an ND computer system to a computer network. The interface is designed according to the internationally accepted standards V.24 (RS-232C), X.21 Bis, or X.21 (X.27).

The ND 107300 contains hardware which packs data into the HDLC (High Level Data Link Control) frame format defined by the ISO standards.

At the frame level, the HDLC format is fully compatible with the SDLC (Synchronous Data Link Control) and the ADCCP (Advanced Data Communication Control Procedure). The HDLC frame format is used in the X.25 communication procedure for connection to a public data network.

The HDLC DMA hardware offers up to 307.2 kbits/s transmission speed, high performance and low processing overhead in communication systems. The HDLC hardware may be operated in half or full duplex on point-to-point lines.

Features¶

Designed according to ISO standards
Modem connections may be CCITT V.24, X.21 Bis or X.21
Half or full duplex operation
Data range up to 307.2 kbits/s using DMA (Direct Memory Access)
Automatic buffer chaining
Requires one slot in the card crate
Speed may be set
Support for Link, leased line, X.21 and X.25
COSMOS support. All computers can share one communication line

Product Description¶

The HDLC DMA module is controlled by means of commands to the microprocessor-controlled DMA logic. When a command is given, data is exchanged between the ND-100/110 CPU and the HDLC processor through a common buffer area.

The buffers are monitored by a mailbox area where relevant status and control information resides.

Page 3¶

HDLC Interface¶

The HDLC Frame Format¶

| 01111110 | A | C | I | FCS | 01111110 |

The FLAG marks the beginning and the end of a frame. The FLAG sequences consist of one zero-bit followed by six one-bits and a zero-bit.

The A-field (8 bits) is meant as a station address, but its contents are not described in the frame standard.

The C-field (8 bits) is a control byte intended for link control. The I-field is the information field and may be any length. The I-field may also be absent.

The FCS is a 16-bit frame check sequence and contains the 16-bit CRC number computed over the bits between the last bit of the opening flag and the first bit of FCS.

The information part of the frame may consist of a number of data blocks (buffers).

HDLC Hardware¶

The HDLC hardware is designed around a 16-bit microprocessor and an LSI chip which takes care of the parallel-to-serial and serial-to-parallel conversion and the control of the frame format.

The microprocessor and its associated PROM give great flexibility for both HDLC formats and BSC-compatible communication on DMA just by using another PROM. (Note that each procedure is registered as a separate ND product).

HDLC DMA Data Structure¶

The HDLC DMA Data Structure allows data transfer from a predefined list without program intervention. This list gives a non-critical system response time in case of heavy I/O load on the system.

Specifications¶

Specification	Description
Number of lines	1 line full duplex/half duplex synchronous
Line connection	CCITT V 24/V.28 (EIA RS-232C) CCITT X.21 Bis CCITT X.21/X.27
Intercomputer link	Differential lines according to X.27 (RS-422) specifications
Crystal-controlled transmission speed	1200, 2400, 4800, 9600, 19200, 38400, 76800, 153600, 307200 bits/second

Prerequisites¶

COSMOS Basic Module when using leased line or link
COSMOS X.21 Option when using X.21
COSMOS X.25 Option when using X.25

Page 4¶

Corporate Headquarters¶

Olof Helsets vei 5
P.O. Box 25, Bogerud
0621 Oslo 6
Norway
Tel.: +47-2-620000
Thk.: 056-27544 nd a
Telefax: +47-2-628681 (A)

Norway¶

Olof Helsets vei 5
Thk.: 7861 nd a
Telefax: +47-2-628681 (A)

Bergen
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Paradisetun. tel.: +47-5-320300

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Grensen. tel.: +47-2-622500

Tromsø
P.O. Box 30, 9010 Tromsø
Tel.: +47-4-776196

Trondheim
Tel.: +47-7-921222

ND COMTEC Head Office¶

Olof Helsets vei 6
P.O. Box 70, Bogerud
0617 Oslo 6
Norway
Tel.: +47-2-620000
Thk.: 056-27661 nd m

Sweden¶

Tel.: +46-8-7595800
Denvan Grd., tel/fax: +46-40-181034

United Kingdom¶

Tel.: +44-1-613-523344
United States, tel.: +1-312-635-1050
Austria, tel.: +43-222-3292133
USA, tel.: +1-415-583-1063

ND Norsk Data AB¶

Kanalvägen 1 A
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194 02 Upplands Väsby
Sweden
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Thk.: 0054-16258 norddata s
Telefax: +46-760-80721 (A)

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International Operations¶

Olof Helsets vei 5
P.O. Box 70, Bogerud
0621 Oslo 6
Norway
Thk.: 056-27544 nd o
Telefax: +47-2-628681 (A)

Hong Kong¶

Norsk Data International
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Represented by Agents and Distributors in:¶

Iceland¶

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Tel.: 354-541-69712
Thk.: 056-96220 oveassy cl

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471902 nordata in

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