Motorola MC68824 User Manual page 11

LIST OF ILLUSTRATIONS
Figure Page
Number Title Number
1-1 10S/OSI Model ............................................................................... 1-2
1-2 IEEE Standard Modem ... ..... ..................... ........ .... ......... ....... ............ 1-3
1-3 Token Bus LAN Node. ....... ............ ..... ........... ............ ..... ........ ......... 1-5
2-1 Data Organization in Memory........ ............ ................ ............ ............ 2-1
2-2 TBC Private Area ............................................................................ 2-2
2-3 Initialization Table........................................................................... 2-11
3-1 Command Parameter Area................................................................ 3-13
4-1 Linked Buffer Structures ..... ............ ....... ......... ........... ............... ........ 4-1
4-2 TBC Queues................................................................................... 4-2
4-3 Frame Descriptor Format.................................................................. 4-3
4-4 Buffer Descriptor Format.................................................................. 4-7
4-5 Examples of Queues Status. ............ ................ ............ ..... .... .... ......... 4-10
4-6 Free Frame Descriptor and Buffer Descriptor Pools................................ 4-12
4-7 Initialization of a Reception Queue.. ...................... .............................. 4-14
4-8 Reception Queue After Receivi ng 0 ne Fra me............ ............................ 4-14
5-1 MC68824 Signals............................................................................ 5-2
5-2 Data Strobe Control of Data Bus in Master Mode................................... 5-3
5-3 Physical Layer Interface.................................................................... 5-5
5-4 Request Channel Encodings for MAC Mode (SMREQ = 1)......................... 5-6
5-5 Request Channel Encodings for Station Management Mode (SMREQ=O).... 5-7
5-6 Indication Channel Encodings for MAC Mode (SMIND = 1) ....................... 5-7
5-7 Encodings for Station Management Mode (SMIND=O) ........................... 5-8
5-8 Typical Station Management Sequence............................................... 5-8
6-1 Host Processor Read Cycle with Two Wait States................................... 6-2
6-2 Host Processor Write Cycle ..... .... ................ ........ .... ........ ......... ......... 6-2
6-3 Interrupt Acknowledge Cycle............................................................. 6-3
6-4 Read Cycle and Slow Read Cycle........................................................ 6-4
6-5 Write Cycle and Slow Write Cycle....................................................... 6-5
6-6 BEC Encoding Definitions.. ...... ...... .......... .......... ........ .... ........ ........... 6-5
6-7 TBC Write Cycle with HALT............................................................... 6-6
6-8 TBC Read Cycle with Bus Error.......................................................... 6-7
6-9 TBC Read Cycle with RETRy.............................................................. 6-7
6-10 TBC Read Cycle with Relinquish and Retry, Early and Late............ ........... 6-8
6-11 TBC Read Cycle with Undefined Bus Exception .............. .............. ......... 6-9
6-12 Bus Arbitration............................................................................... 6-9
6-13 Bus Arbitration Unit State Diagram..................................................... 6-11
6-14 Bus Timing Diagram........................................................................ 6-12
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MC68824 USER'S MANUAL
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