Motorola MC68838 Bedienungsanleitung

MC68838

Media Access Controller

User’s Manual

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MOTOROLA MC68838 USER’S MANUAL iii

TABLE OF CONTENTS

Paragraph Page

Number Title Number

Section 1

Introduction

1.1 Overview...........................................................................................................1-2

1.2 Chip Features..................................................................................................1-2

Section 2

Functional Description

2.1 Node Processor Interface Logic...................................................................2-1

2.2 Receive Data Path..........................................................................................2-1

2.2.1 Receive Latch..............................................................................................2-2

2.2.2 Receive CRC Checker...............................................................................2-3

2.2.3 Sent Count...................................................................................................2-3

2.2.4 Counters.......................................................................................................2-3

2.2.5 Receive Finite State Machine...................................................................2-3

2.2.6 Address Comparator..................................................................................2-4

2.2.7 Receive Host Interface...............................................................................2-4

2.3 Transmit Data Path.........................................................................................2-4

2.3.1 Transmit Data Host lnterface....................................................................2-5

2.3.2 Send Frame Logic......................................................................................2-5

2.3.3 Capture Token Logic..................................................................................2-5

2.3.4 Transmit CRC Generator...........................................................................2-6

2.3.5 Transmit Finite State Machine..................................................................2-6

2.3.6 Timers...........................................................................................................2-6

2.3.7 Transmit Data Latch (and Repeat Function)..........................................2-7

2.4 Test and Clock Logic......................................................................................2-7

Section 3

3.1 Register Types.................................................................................................3-3

3.1.1 Read/Write Registers..................................................................................3-3

3.1.2 Read/Control Write Registers...................................................................3-3

3.1.3 Read-Only/Clear Registers.......................................................................3-3

3.1.4 Read-Only Registers..................................................................................3-3

3.2 Control and Status Registers........................................................................3-4

3.2.1 Control Register A (MAC_CNTRL_A).....................................................3-4

3.2.2 Control Register B (MAC_CNTRL_B).....................................................3-8

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iv MC68838 USER’S MANUAL MOTOROLA

TABLE OF CONTENTS (Continued)

Paragraph Page

Number Title Number

3.2.3 Receive Status Register (RX_STATUS).................................................3-13

3.2.4 Transmit Status Register (TX_STATUS)................................................3-15

3.3 Interrupt Registers...........................................................................................3-17

3.3.1 Interrupt Event Register A (INTR_EVENT_A)........................................3-17

3.3.2 Interrupt Event Register B (INTR_EVENT_B)........................................3-20

3.3.3 Interrupt Event Register C (INTR_EVENT_C)........................................3-23

3.3.4 Interrupt Mask Register A (INTR_MASK_A)...........................................3-23

3.3.5 Interrupt Mask Register B (INTR_MASK_B)...........................................3-23

3.3.6 Interrupt Mask Register C (INTR_MASK_C)..........................................3-23

3.4 Counter Registers...........................................................................................3-24

3.4.1 Frame Count Register (FRAME_CT).......................................................3-25

3.4.2 Lost Count, Error Count Register (LOST_CTERROR_CT) .................3-25

3.4.3 Token Count Register (TOKEN_CT).......................................................3-25

3.5 Station Parameter Registers.........................................................................3-25

3.5.1 My Short Address Register (MSA)...........................................................3-25

3.5.2 My Long Address Register (MLA_A, MLA_B, MLA_C)........................3-26

3.5.3 Target Request Time Register (T_REQ).................................................3-26

3.5.4 TVX, TRT Initial Timer Parameter Register (TVX_VALUE, T_MAX)..3-26

3.6 Protocol Timing Registers.............................................................................3-27

3.6.1 TVX Timer Register (TVX_TIMER)...........................................................3-27

3.6.2 TRT Timer Register (TRT_TIMER_A, TRT_TIMER_B)..........................3-27

3.6.3 THT Timer, Sent Count Registers (THT_TIMER_A,

THT_TIMER_B, SENT_COUNT)..............................................................3-28

3.6.4 TRT Time Remaining Register (T_NEG_A, T_NEG_B).......................3-29

3.6.5 Information Field Register (INFO_REG_A).............................................3-29

3.6.6 Void Time Counter Register (VOID_TIME).............................................3-29

3.7 Internal Registers............................................................................................3-30

3.7.1 Revision Number Register (REV_NO_REG)..........................................3-30

3.7.2 Packet Request Register (PKT_REQUEST)..........................................3-30

3.7.3 Built-In Self-Test Signature Register (BIST_SIGNATURE)................3-31

3.7.4 Receive CRC Register (RX_CRC)...........................................................3-32

3.7.5 Transmit CRC Registers (TX_CRC).........................................................3-32

Section 4

Signal Description

4.1 Clock Signals..................................................................................................4-1

4.2 Node Processor Interface..............................................................................4-2

4.3 MAC-PHY Interface........................................................................................4-3

4.4 Receive System Interface..............................................................................4-3

4.5 Transmit System Interface.............................................................................4-4

4.6 CAM Interface..................................................................................................4-5

4.7 Test Signals.....................................................................................................4-6

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MOTOROLA MC68838 USER’S MANUAL v

TABLE OF CONTENTS (Continued)

Paragraph Page

Number Title Number

Section 5

Bus Operation

5.1 NPI Operation..................................................................................................5-1

5.2 Read Cycle.......................................................................................................5-1

5.3 Write Cycle.......................................................................................................5-3

Section 6

MAC-PHY Interface Operation

Section 7

Receive Data Path Operation

7.1 Receive Data Processing..............................................................................7-1

7.2 Receive Data System Interface....................................................................7-1

7.3 Receive Data Path Operation.......................................................................7-1

Section 8

Transmit Data Path Operation

8.1 Transmit Data Path Control...........................................................................8-1

8.2 MAC Packet Transmission............................................................................8-3

8.3 Packet Request Header.................................................................................8-4

Section 9

CAM Interface Operation

9.1 CAM Interface Operation...............................................................................9-1

9.1.1 Normal (Nonextended) Match Mode.......................................................9-1

9.1.2 Extended Match Mode...............................................................................9-2

9.2 Extensions to A and C Bit Handling............................................................9-4

Section 10

Test Operation

10.1 Built-In Self-Test Operation.........................................................................10-1

10.2 Scan Path Operation....................................................................................10-2

Section 11

Electrical Characteristics

11.1 Maximum Ratings.........................................................................................11-1

11.2 Recommended Operating Conditions......................................................11-1

11.3 Thermal Characteristics...............................................................................11-1

11.4 Electrical Characteristics.............................................................................11-2

11.5 Node Processor Interface Timing..............................................................11-2

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vi MC68838 USER’S MANUAL MOTOROLA

TABLE OF CONTENTS (Concluded)

Paragraph Page

Number Title Number

11.6 MAC-FSI Timing............................................................................................11-4

11.7 MAC-ELM Timing..........................................................................................11-5

11.8 CAM Interface Timing...................................................................................11-6

Section 12

Ordering Information and Mechanical Data

12.1 Ordering Information....................................................................................12-1

12.2 Pin Assignments...........................................................................................12-2

12.2.1 120-Lead Ceramic Pin Grid Array w/Ceramic Lid (KB).....................12-2

12.2.2 120-Lead Plastic Quad Gull Wing (FC)................................................12-3

12.3 Package Dimensions...................................................................................12-4

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MOTOROLA MC68838 USER’S MANUAL vii

LIST OF ILLUSTRATIONS

Figure Page

Number Title Number

1-1 Motorola FDDI Architecture.....................................................................................1-1

2-1 MAC Block Diagram.................................................................................................2-2

4-1 MAC Functional Pinout............................................................................................4-1

5-1 Node Processor Bus Read Cycles........................................................................5-2

5-2 Node Processor Bus Write Cycles.........................................................................5-3

7-1 Receive Data Flowchart...........................................................................................7-4

8-1 TXRDY and Packet Request Header Timing.......................................................8-2

9-1 CAM Interface Signals (EXT_DA_MATCH = 0)..................................................9-2

9-2 CAM Interface Signals (EXT_DA_MATCH = 1)..................................................9-3

9-3 CAM Interface Timing (Receiving Token Frame for Normal and

Extended Match Mode)........................................................................................9-3

11-1 Node Processor Interface Timing........................................................................11-3

11-2 MAC-FSI Timing......................................................................................................11-4

11-3 MAC-ELM Timing....................................................................................................11-5

11-4 CAM Interface Timing.............................................................................................11-6

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viii MC68838 USER’S MANUAL MOTOROLA

LIST OF TABLES

Table Page

Number Title Number

3-1 MAC Registers...........................................................................................................3-2

6-1 RCDATx/TXDATx Encoding....................................................................................6-1

7-1 RCCTLx and RPATHx Relationship......................................................................7-3

9-1 MAC A and C Bit Control.........................................................................................9-4

10-1 BIST Register Values.............................................................................................10-2

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MOTOROLA MC68838 USER’S MANUAL ix

LIST OF ACRONYMS

ANSI—American National Standard Institute

ATE—Automatic Test Equipment

BIST—Built-In Self-Test

CAM—Content Addressable Memory

CMOS—Complementary Metal-Oxide Semiconductor

CRC—Cyclic Redundancy Check

CT—Count, Actions for MAC FSM

DA—Destination Address

ELM—Elasticity Buffer and Link Management Device

FC—Frame Control Field of FDDI Frame

FCG—FDDI Clock Generator

FCS Field—32-Bit CRC Appended to Transmitted Frames

FCS—Frame Check Sequence

FDDI—Fiber Distributed Data Interface

FDX—Full Duplex

FS—Frame Status

FSI—FDDI System Interface

FSM—Finite State Machine

INFO—Information Field

LAN—Local Area Network

LFSR—Linear Feedback Shift Register

LLC—Logical Link Control

MAC—Media Access Controller

MUX—Multiplex

NP—Node Processor

NPA—Node Processor Address Bus

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xMC68838 USER’S MANUAL MOTOROLA

LIST OF ACRONYMS (Continued)

NPD—Node Processor Data Bus

NPI—Node Processor Interface

NSA—Next Station Address

PHY—Physical Layer of FDDI Standard

SA—Source Address

SMT—Station Management

TRT—Token Rotation Time

TTL—Transistor-Transistor Logic

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