Motorola MC68824 User manual

Introduction
II
Tables
II
Commands
II
Buffer Structures
II
Signals
II
Bus Operation
II
TBC Interfaces
II
Electrical Specifications
II
Ordering Information and Mechanical Data II
IEEE 802.4 Operation II
Frame Formats and Addressing II
Bridging II
Performance ..

This document contains information on a new product. Specifications and information
herein are subjecttochange withoutnotice. Motorola reserves the rightto make changes
to any products herein to improve functioning or design. Although the information
in
this document has been carefully reviewed and is believed to be reliable, Motorola does
not assume any liability arising out of the application or
use of any product or circuit
described herein; neither does it convey any license under its patent right northe rights
of others.
Motorola, Inc. general policy does not recommend the use of its components in life support applications
wherein a failure or malfunction of the component may directly threaten life or injury. Per Motorola Terms
and Conditions
of Sale, the user of Motorola components in life support applications assumes all risk of
such use and indemnifies Motorola against all damages.
©MOTOROLA INC., 1987

Paragraph
Number
1.1
1.2
1.2.1
1.2.2
1.3
1.3.1
1.3.2
1.4
1.5
1.6
1.7
1.8
1.8.1
1.8.2
1.8.3
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.1.9
2.1.10
2.1.11
2.1.12
2.1.13
2.1.14
2.1.15
2.1.16
2.1.17
2.1.18
2.1.19
2.1.20
TABLE OF CONTENTS
Page
Title Number
Section 1
Introduction
Features....................................... .................................. .......... ..... 1-1
Logical Area Network Standards ........ ........................ ............ ............ 1-2
150/051 Reference Model............................................................ 1-2
IEEE Local Area Network Standards.............................................. 1-3
IEEE 802.4 Token Bus Local Area Networks.......... ................................ 1-3
Token Bus Operation............. ............................... ...... ........... ..... 1-3
Options Within IEEE 802.4...... ........ ................ .................... .... ..... 1-4
TBC Environment. .......... ............ ........ ............ ........................ .... ..... 1-4
Physical Layer Interface.................................................................... 1-5
Microprocessor System Bus Interface. ........ .................... ............ ......... 1-5
Shared Memory.............................................................................. 1-6
Overview of TBC Functional Operation ................................................ 1-6
Command Structure Overview .... ................................................. 1-6
Frame Reception Overview.......................................................... 1-6
Frame Transmission Overview.... ........................................ ......... 1-7
Section 2
Tables
TBC Private Area ............................................................................ 2-1
Next Station Address................................................................. 2-1
Previous Station Address............................................................ 2-3
Hi-Priority-Token-Hold Time....................................................... 2-3
Last Token-Rotation-Time ....................................... ................... 2-3
Token Rotation Time at Start of Access Classes............................... 2-4
Target Token Rotation Time for Access Classes............................... 2-4
Token Rotation Time at Start of Ring Maintenance........................... 2-4
Target Rotation Time for Ring Maintenance.................................... 2-4
Ring Maintenance Time Initial Value.............................................. 2-5
Source Routing -Source Segment/Bridge 10 (SID) .......................... 2-5
Source Routing -Target Segment/Bridge 10 (TID) ..... ...................... 2-5
Segment Number Mask for Source Routing.................................... 2-5
Max-Inter-Solicit-Count ........ ............................... ...... ...... .......... 2-5
RX Frame Status Error Mask.................................... .................... 2-6
TX Queue Access Class Status............................ .......................... 2-6
TX Queue Access Class Pointers................................................... 2-6
RX Queue Access Class Pointers................................................... 2-6
Free Frame Descriptor Pointer...................................................... 2-7
Free Buffer Descriptor Pointer ...................................................... 2-7
Group Address Mask............................................. ..................... 2-7
MC68824 USER'S MANUAL
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Number
2.1.21
2.1.22
2.1.23
2.1.24
2.1.25
2.1.26
2.1.27
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.2.10
2.2.11
2.2.11.1
2.2.11.2
2.2.12
2.2.13
2.2.13.1
2.2.13.2
2.2.13.3
2.2.13.4
2.2.13.5
2.2.13.6
2.2.13.7
2.2.13.8
2.2.14
2.2.14.1
2.2.14.2
2.2.14.3
2.2.14.4
2.2.15
TABLE OF CONTENTS (Continued)
Page
Title Number
Individual Address Mask............................................................. 2-8
Non-RWR Maximum Retry Limit................................................... 2-8
RWR Maximum Retry Limit......................................................... 2-9
Slot Time................................................................................. 2-9
This Station Address.... ....... ........ ............ ......... ..... ...... ....... ........ 2-9
Manufacturer Product Revision and 802.4 Standard Revision Number.. 2-9
Transmitter Fault Count ............. ~................................................ 2-10
Initialization Table ....... ........... .... ................. .......... ..... ...... ............... 2-10
Private Area Function Code......................................................... 2-10
Private Area Pointer ............ ........ .... ................. ...................... .... 2-10
Parameters Initializing the Private Area ............ ...... ........................ 2-10
Initial Pad Timer Preset (PTP) .................. ...................... ...... ......... 2-13
Initial In-Ring Desired ..... ...... ...... ........... ........ ....... ...... ............... 2-13
Initial Address Length............ ...... ........... ......... ...... ...... ............... 2-13
Response Destination Address Pointer ............................ ............... 2-13
Response Pointer. ....... .... ................ ........... .......... ....... ..... ......... 2-13
Request with Response Pointer .............. ........ .................... .......... 2-14
Command Parameter Area .......................................................... 2-14
Interrupt Status Words ............................................................... 2-15
Interrupt Status Word 0........ ....... ................ ..... ...... ......... ...... 2-15
Interrupt Status Word 1 ....... :................................................. 2-17
Interrupt Masks......... ............................ .... ........ .... ............ ......... 2-19
Statistics ................................................................................. 2-19
Number of Tokens Passed ..................................................... 2-20
Number of Tokens Heard....................................................... 2-20
Number of Passes Through No Successor 8 .......... .................... 2-20
Number of Who Follows............................................... ......... 2-20
Number of Token Pass Failed................................................. 2-20
Number of Frames Too Long (>8K Bytes)................................. 2-20
Number of No FD/BD Errors................................................... 2-20
Number of Overruns............................................................. 2-21
Modem Error Counters............................................................... 2-21
Non-Silence........................................................................ 2-21
FCS Errors.......................................................................... 2-21
E-Bit Errors......................................................................... 2-21
Frame Fragments................................................................. 2-21
DMA Dump Area....................................................................... 2-21
Section 3
Commands
3.1 Registers...... ........................................... ............ ........... ..... ...... .... 3-2
3.1.1 TBC Register Map...................................................................... 3-3
3.1.2 Command Register (CR).............................................................. 3-3
3.1.3 Data Register (DR) ..................................................................... 3-3
3.1.4 Interrupt Vector Register (IV)............ ........ ............ ........................ 3-3
3.1.5 Semaphore Register.............. ..................................................... 3-4
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MC68824 USER'S MANUAL

TABLE OF CONTENTS (Continued)
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Number Title Page
Number
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.4
3.4.1
3.4.2
3.4.3
3.5
3.5.1
3.5.2
3.5.3
3.5.3.1
3.5.3.2
3.5.3.3
3.5.3.4
3.5.3.5
3.5.3.6
3.6
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.7
3.7.1
3.7.2
3.8
3.8.1
3.8.1.1
3.8.1.2
3.8.2
3.9
Initialization................................................................................... 3-4
LOAD INITIALIZATION TABLE FUNCTION CODE Command ................ 3-5
INITIALIZE Command.............................................. ................... 3-5
OFFLINE Command.............................................. ..................... 3-5
IDLE Command......................................................................... 3-6
RESET Command.............................................. ........................ 3-6
Set Operation Mode........................................................................ 3-7
SET MODE 1 Command.............................................................. 3-7
SET MODE 2 Command.............................................................. 3-8
SET MODE 3 Command .............................................................. 3-10
SET/CLEAR IN-RING DESIRED Command... .................... ................ 3-11
TX Data Frames............................. ................ ................................. 3-23
STOP Command .................................................................... ... 3-12
RESTART Command .................................................................. 3-12
START Command........... ..... ........................................ .............. 3-12
Set/Read Value
............................................................................... 3-13
Command Parameter Area
.......................................................... 3-13
READ VALUE Command ............................................................. 3-16
SET VALUE Command .............. ................................................. 3-16
Buffer Descriptor Function
Code......................... ..................... 3-17
Frame Descriptor Function Code
............................................. 3-17
Data Buffers Function Code...
................................... .............. 3-17
Set Pad Timer Preset Register (PTP).......................... ............... 3-17
Set One Word ..................................................................... 3-18
Set Two Words................................................................... 3-18
Testing
.............................. ..................................... ...................... 3-18
SET INTERNAUEXTERNAL LOOPBACK MODE Command .................. 3-19
HOST INTERFACE TEST Command ............................................... 3-19
FULL-DUPLEX LOOPBACK TEST Command .................................... 3-20
TRANSMITTER TEST Command ......... ............... ........................... 3-22
RECEIVER TEST Command.......................................................... 3-23
Sequence for Running all the Tests ............................................... 3-24
Notify
TBC..................................................................................... 3-26
CLEAR INTERRUPT STATUS Command......................................... 3-26
RESPONSE READY Command......... ............................................. 3-27
Modem
Control.............................................................................. 3-27
PHYSICAL Command................................................................. 3-27
Immediate Commands...................... .................................... 3-28
Data Transfer
Commands...................................................... 3-29
END PHYSICAL Command.......................... ............ ..................... 3-30
Illegal
Commands.............................................. ............................. 3-30
Section 4
Buffer
Structures
4.1 Buffer Structures ... .......... .... ...... ...... ............................ ................... 4-2
4.1.1 Frame
Descriptors................ ...... .... ... ................. .... ....... ............ 4-2
4.1.1.1
FD Confirmation/Indication Word Format.................................. 4-3
MC68824 USER'S MANUAL
MOTOROLA
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Number
4.1.1.2
4.1.1.3
4.1.1.4
4.1.1.5
4.1.1.6
4.1.1.7
4.1.1.8
4.1.1.9
4.1.1.10
4.1.2
4.1.2.1
4.1.2.2
4.1.2.3
4.1.2.4
4.1.2.5
4.1.3
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.3
4.3.1
4.3.2
4.3.3
4.4
4.5
TABLE OF CONTENTS (Continued)
Page
Title Number
Receive Status Word ..... ................................. ...................... 4-5
Control for Next Frame Descriptor Pointer............. .................... 4-5
Next Frame Descriptor Pointer..... ............ ..... ........... ............... 4-6
First Buffer Descriptor Pointer.............. ........ ................. ....... ... 4-6
Frame Data Length............................................................... 4-6
Immediate Response Frame Descriptor Pointer.......................... 4-6
Frame Control..................................................................... 4-6
MAC Destination Address...................................................... 4-6
MAC Source Address............................................................ 4-6
Buffer Descriptors....... ..... .... ....................................... ............... 4-6
Data Buffer Pointer............................................................... 4-7
Buffer Descriptor Control and Offset ......................... ............... 4-7
Buffer Length...................................................................... 4-8
Receive Indication Word........................................................ 4-8
Next Buffer Descriptor Pointer....... ..... .... ........... ..................... 4-8
Data Buffers.. .......... ............. .................... ................................ 4-8
Transmission of a Frame.... ......... .... ................... .................... .......... 4-8
Initialization Performed by Host.................................................... 4-9
Management of Transmission Queues........................................... 4-9
Examples of TBC Transmission Queues......................................... 4-10
Adding a Frame to a Transmission Queue...................................... 4-11
TBC's Actions Upon Transmission ................................. ............... 4-11
Reception of Frames............................................. ..................... ...... 4-12
Initialization Performed by Host............................... .... ................. 4-12
Reception Queues and Free Pools ............................ ... ............ ...... 4-13
TBC's Action Upon Reception ...................................................... 4-14
Request with Response (RWR) Transmission ........................................ 4-15
Reception of RWR Frames and Transmission of Response ...... ............ ..... 4-16
Section 5
Signals
5.1 Address Bus (A1-A31) ...................................................................... 5-1
5.2 Data Bus (00-015)........................................................................... 5-1
5.3 Bus Control ................................................................................... 5-1
5.3.1 Function Codes (FCO-FC3) ........................................................... 5-1
5.3.2 Bus Exception Conditions (BECO-BEC2) ............................... ..... ...... 5-2
5.3.3 Data Transfer Acknowledge (DTACK) ............................................. 5-3
5.3.4 ReadIWrite (RIW)....................................................................... 5-3
5.3.5 Upper Data Strobe (UDS/AO), Lower Data Strobe (LOS/OS).... ....... ...... 5-3
5.3.6 Address Strobe (AS) .................................................................. 5-3
5.3.7 Chip Select (CS) ....... ........................... ................................ ...... 5-4
5.4 Bus Arbitration............................................................................... 5-4
5.4.1 Bus Request (BR) ...................................................................... 5-4
5.4.2 Bus Grant (BG) ... ..... ............. .......... ..... ............. ... ........... .......... 5-4
5.4.3 Bus Grant Acknowledge (BGACK) ................................................. 5-4
MOTOROLA
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Number
5.5
5.5.1
5.5.2
5.6
5.6.1
5.6.1.1
5.6.1.2
5.6.1.3
5.6.1.4
5.6.2
5.6.2.1
5.6.2.2
5.6.2.3
5.6.2.4
5.7
TABLE OF CONTENTS (Continued)
Page
Title Number
Interrupt Control............................................................................. 5-4
Interrupt Request (lRO) ... ............................................................ 5-5
Interrupt Acknowledge (lACK) ...................................................... 5-5
Serial Interface............................................................................... 5-5
Physical Data Request Channel.................................. ................... 5-5
Station Management Request (SMREO).................................... 5-6
Transmit Clock (TXCLK)......................................................... 5-6
TXSYM2, TXSYM1, and TXSYMO in MAC Mode ......................... 5-6
TXSYM2, TXSYM1, and TXSYMO in Station Management Mode.... 5-6
Physical Data Indication Channel............................. ..................... 5-7
Station Management Indication (SMIND) ............. ........... .......... 5-7
Receive Clock (RXCLK) ........ ;................................................. 5-7
RXSYMO, RXSYM1, and RXSYM2 in MAC Mode......................... 5-7
RXSYM2, RXSYM1, and RXSYMO in Station Management Mode.... 5-8
Signal Summary............................................................................. 5-9
Section 6
Bus Operation
6.1 Host Processor Operation Mode......................................................... 6-1
6.1.1 Host Processor Read Cycles......................................................... 6-1
6.1.2 Host Processor Write Cycles........................................................ 6-1
6.1.3 Interrupt Acknowledge Cycles...................................................... 6-2
6.2 DMA Operation.............................................................................. 6-3
6.2.1 DMA Burst Control.................................................................... 6-3
6.2.2 TBC Read Cycles....................................................................... 6-4
6.2.3 TBC Write Cycles....................................................................... 6-4
6.3 Bus Exception Control Functions........................................................ 6-4
6.3.1 Normal Termination....................... ................. .... ........................ 6-6
6.3.2 Halt................ .... ............. ..... ................. ............. .......... .......... 6-6
6.3.3 Bus Error................................................................................. 6-6
6.3.4 Retry................................ .... ................. ............... .................. 6-6
6.3.5 Relinquish and Retry.................................................................. 6-8
6.3.6 Reset..................... ..................... ............................................ 6-8
6.3.7 Undefined BEC Codes ................................................................ 6-8
6.4 Bus Arbitration ............. ................ ........... ............ ........................... 6-8
6.4.1 Requesting the Bus .................................................................... 6-10
6.4.2 Receiving the Bus Grant ....... ...... ..................... ....... ..... ........ ....... 6-10
6.4.3 Acknowledgement of Mastership.. .................... ........ .................... 6-10
6.4.4 Bus Arbitration Control............................................................... 6-10
6.4.5 Reset Operation............ ................ ................. ...... ....... ............. ....... 6-10
6.5 Bus Overhead Time......................................................................... 6-11
6.5.1 Front-End Overhead................................................................... 6-11
6.5.2 Back-End Overhead.................................................................... 6-12
6.6 Registers....................................................................................... 6-12
MC68824 USER'S MANUAL
MOTOROLA
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TABLE OF CONTENTS (Continued)
Paragraph Page
Number Title Number
Section 7
TBC Interfaces
7.1 T8C-to-Host Processor Interface.. .................................. ..................... 7-1
7.2 Non-M68000 8us Interface ................ ................................................ 7-1
7.3 MAC Sublayer-to-Physical-Layer Interface...................... ...................... 7-4
Section 8
Electrical Specifications
8.1 Maximum Ratings........................................................................... 8-1
8.2 Thermal Characteristics.... .................... ............................................ 8-1
8.3 Power Considerations...................................................................... 8-1
8.4 DC Electrical Characteristics.............................................................. 8-2
8.5 AC Electrical Characteristics.............................................................. 8-2
Section 9
Ordering Information and Mechanical Data
9.1 Package Types............................................................................... 9-1
9.2 Standard Ordering Information.......................................................... 9-1
9.3 Pin Assignments............................................................................. 9-2
9.4 Package Dimensions........................................................................ 9-3
Appendix A
IEEE 802.4 Operation
A.1 Fu nctions ................ ......................... . ................................ ............ A-1
A.2 Steady Station Operation.................................................................. A-1
A.3 Initialization................................................................................... A-2
A.4 Passing the Token........................................................................... A-2
A.5 Adding New Stations................. ...................... ........ ........................ A-3
A.6 Priority................................. .................. ............ .............. ............ A-4
Appendix B
Frame Formats and Addressing
8.1 Frame Formats and Addressing......................................................... 8-1
8.1.1 Preamble...................................................................... ........... 8-1
8.1.2 Start Delimiter .......................................................................... 8-1
8.1.3 Frame Control.......................................................................... 8-2
8.1.4 Address Fields.......................................................................... 8-3
8.1.5 Data.......................................... ........................... .. ................ 8-3
8.1.6 Frame Check Sequence (FCS)................ ....................................... 8-3
8.1.7 End Delimiter ........................................................................... 8-3
8.1.8 Invalid Frames.......................................................................... 8-3
8.1.9 Abort Sequence........................................................................ 8-4
MOTOROLA
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Paragraph
Number
B.2
B.2.1
B.2.2
B.2.3
B.2.4
C.1
C.2
C.2.1
C.2.2
C.3
C.3.1
C.3.2
C.3.3
TABLE OF CONTENTS (Concluded)
Page
Title Number
Addressing.................................................................................... B-4
IEEE Addressing........................................................................ B-4
Individual Addressing................................................................. B-4
Group Addressing..................................................................... B-6
Promiscuous Listener...................................................................... B-6
Appendix C
Bridging
Interconnection of Networks......................................................... ..... C-1
Hierarchical Addressed Bridging ........................................................ C-1
Hierarchical Addressed Bridging Implementation............................. C-2
Lower Bridges.......................................................................... C-3
Flat Addressed Bridging Overview...................................................... C-3
Source Routing Implementation................................................... C-4
Route Designators..................................................................... C-5
Source Routing Operation ........................................................... C-6
Appendix 0
Performance
MC68824 USER'S MANUAL
MOTOROLA