DS31256+ datasheet(2/183 Pages) MAXIM

2 / 183 page

DS31256 256-Channel, High-Throughput HDLC Controller

2 of 183

TABLE OF CONTENTS

MAIN FEATURES............................................................................................................6

DETAILED DESCRIPTION..............................................................................................7

SIGNAL DESCRIPTION ................................................................................................13

3.1

OVERVIEW/SIGNAL LIST .............................................................................................................13

3.2

SERIAL PORT INTERFACE SIGNAL DESCRIPTION..........................................................................18

3.3

LOCAL BUS SIGNAL DESCRIPTION ..............................................................................................19

3.4

JTAG SIGNAL DESCRIPTION ......................................................................................................22

3.5

PCI BUS SIGNAL DESCRIPTION ..................................................................................................22

3.6

PCI EXTENSION SIGNALS...........................................................................................................25

3.7

SUPPLY AND TEST SIGNAL DESCRIPTION....................................................................................25

MEMORY MAP ..............................................................................................................26

4.1

INTRODUCTION ..........................................................................................................................26

4.2

GENERAL CONFIGURATION REGISTERS (0XX) .............................................................................26

4.3

RECEIVE PORT REGISTERS (1XX)...............................................................................................27

4.4

TRANSMIT PORT REGISTERS (2XX).............................................................................................27

4.5

CHANNELIZED PORT REGISTERS (3XX).......................................................................................28

4.6

HDLC REGISTERS (4XX)............................................................................................................29

4.7

BERT REGISTERS (5XX)............................................................................................................29

4.8

RECEIVE DMA REGISTERS (7XX) ...............................................................................................29

4.9

TRANSMIT DMA REGISTERS (8XX) .............................................................................................30

4.10

FIFO REGISTERS (9XX) .............................................................................................................30

4.11

PCI CONFIGURATION REGISTERS FOR FUNCTION 0 (PIDSEL/AXX).............................................31

4.12

PCI CONFIGURATION REGISTERS FOR FUNCTION 1 (PIDSEL/BXX).............................................31

GENERAL DEVICE CONFIGURATION AND STATUS/INTERRUPT...........................32

5.1

MASTER RESET AND ID REGISTER DESCRIPTION........................................................................32

5.2

MASTER CONFIGURATION REGISTER DESCRIPTION ....................................................................32

5.3

STATUS AND INTERRUPT ............................................................................................................34

5.3.1

General Description of Operation ....................................................................................................... 34

5.3.2

Status and Interrupt Register Description ........................................................................................... 37

5.4

TEST REGISTER DESCRIPTION ...................................................................................................43

LAYER 1 ........................................................................................................................44

6.1

GENERAL DESCRIPTION .............................................................................................................44

6.2

PORT REGISTER DESCRIPTIONS.................................................................................................48

6.3

LAYER 1 CONFIGURATION REGISTER DESCRIPTION ....................................................................51

6.4

RECEIVE V.54 DETECTOR..........................................................................................................56

6.5

BERT .......................................................................................................................................60

6.6

BERT REGISTER DESCRIPTION .................................................................................................61

HDLC .............................................................................................................................67

7.1

GENERAL DESCRIPTION .............................................................................................................67

7.2

HDLC REGISTER DESCRIPTION .................................................................................................69

FIFO ...............................................................................................................................74

8.1

GENERAL DESCRIPTION AND EXAMPLE.......................................................................................74

8.1.1

Receive High Watermark .................................................................................................................... 76

8.1.2

Transmit Low Watermark.................................................................................................................... 76

8.2

FIFO REGISTER DESCRIPTION ...................................................................................................76

DMA ...............................................................................................................................83

9.1

INTRODUCTION ..........................................................................................................................83

9.2

RECEIVE SIDE ...........................................................................................................................85

9.2.1

Overview ............................................................................................................................................. 85

9.2.2

Packet Descriptors .............................................................................................................................. 90

9.2.3

Free Queue ......................................................................................................................................... 92

9.2.4

Done Queue........................................................................................................................................ 97

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