Motorola MC68824 User Manual page 8

Paragraph
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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