UPD6708GS Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD6708GS

IEBus™ (Inter Equipment Bus™) PROTOCOL CONTROL LSI

NEC => Renesas Technology 

µPD6708

CONTENTS

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

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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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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