UPD6708 datasheet(3/72 Pages) NEC

3 / 72 page

µPD6708

CONTENTS

PIN FUNCTIONS ......................................................................................................................................... 5

1.1

List of Pin Functions ......................................................................................................................................... 5

IEBus OPERATION .................................................................................................................................... 6

2.1

Operation Overview ........................................................................................................................................... 6

2.2

IEBus Communication Protocol ...................................................................................................................... 7

2.2.1

Bus mastership determination (arbitration) ................................................................................... 8

2.2.2

Communication modes ...................................................................................................................... 8

2.2.3

Communication address ................................................................................................................... 9

2.2.4

Broadcast communication ................................................................................................................ 9

2.3

Transfer Protocol ............................................................................................................................................. 10

2.4

Transfer Data (Contents of Data Field) ......................................................................................................... 16

2.5

Bit Format ......................................................................................................................................................... 19

INTERNAL CONFIGURATION ................................................................................................................. 20

3.1

Data Link Layer Controller ............................................................................................................................. 21

3.2

Physical Layer Controller ............................................................................................................................... 21

3.3

IEBus Driver/Receiver ..................................................................................................................................... 21

3.4

Host Interface ................................................................................................................................................... 21

INTERFACING WITH HOST CONTROLLER .......................................................................................... 22

4.1

Accessible Buffers and Registers from Host Controller ........................................................................... 22

4.1.1

Write data buffer (WDB) .................................................................................................................. 22

4.1.2

Read data buffer (RDB) ................................................................................................................... 22

4.1.3

Command register (CMR) ................................................................................................................ 22

4.1.4

Status register (STR) ....................................................................................................................... 23

4.2

Host Interface Modes ...................................................................................................................................... 23

4.2.1

Switching through pin control ....................................................................................................... 24

4.2.2

Switching through software control .............................................................................................. 26

4.3

Reset Mode ....................................................................................................................................................... 28

COMMUNICATION CONTROL COMMANDS ......................................................................................... 30

5.1

Overview of Communication Control Commands....................................................................................... 30

5.2

Communication Control Command Functions ............................................................................................ 31

5.2.1

INIT command (command code: 0000) .......................................................................................... 31

5.2.2

SETSA command (command code: 0001) .................................................................................... 32

5.2.3

MREQ1 command (command code: 0010) ................................................................................... 33

5.2.4

MREQ2 command (command code: 0011) ................................................................................... 34

5.2.5

ABORT command (command code: 0100) ................................................................................... 34

5.2.6

SETSD command (command code: 0101) .................................................................................... 35

5.2.7

GETSTA command (command code: 0110) .................................................................................. 36

5.2.8

SETREV command (command code: 0111) .................................................................................. 37

RETURN CODES ...................................................................................................................................... 38

6.1

Return Codes in Master/Slave Data Transmission ..................................................................................... 38

6.2

Return Codes in Master Reception ............................................................................................................... 38

6.3

Return Codes in Slave Reception ................................................................................................................. 39

6.4

Return Codes in Broadcast Reception ......................................................................................................... 39

6.5

Return Codes Generation Intervals ............................................................................................................... 40

COMMUNICATING WITH HOST CONTROLLER ................................................................................... 43

7.1

Master Transmission ....................................................................................................................................... 43

7.1.1

Master transmission by MREQ1 command .................................................................................. 43

7.1.2

Master transmission by MREQ2 command .................................................................................. 44

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