Motorola MVME712A 用户手册

Interconnect Signals

3-11

Each pin connection, signal mnemonic, and signal characteristic for the 
connector is listed in 

. 

46

D/C*

DATA/COMMAND - signal driven by the 
target. It indicates whether command or data 
information is on the data bus. True (low) 
indicates command. 

47

GND

GROUND 

48

REQ*

REQUEST - signal driven by a target to indicate 
a request for a REQ/ACK data transfer 
handshake. 

49

GND

GROUND 

50

O/I*

OUTPUT/INPUT - signal driven by a target that 
controls the direction of data movement on the 
bus. True (low) indicates input to the initiator. 
False (high) indicates output from the initiator. 
This signal is also used to distinguish between 
selection and reselection phases. 

1-25

GND

GROUND 

26

DB00*

DATA bus (bit 0) - least signiÞcant bit and the 
lowest priority during the arbitration phase. 

27

DB01*

DATA bus (bit 1) 

28

DB02*

DATA bus (bit 2) 

29

DB03*

DATA bus (bit 3) 

30

DB04*

DATA bus (bit 4) 

31

DB05*

DATA bus (bit 5) 

32

DB06*

DATA bus (bit 6)