Signal Description
2-18
M68060 USER’S MANUAL
MOTOROLA
Table 2-8. Signal Summary
Signal Name
Mnemonic
Input/
Output
Active
State
Three-State
Reset
State
Address Bus
A31–A0
Input/Output
High
Yes
Three-Stated
Cycle Long-Word Address
CLA
Input
Low
—
Data Bus
D31–D0
Input/Output
High
Yes
Three-Stated
Transfer Type 1
TT1
Input/Output
High
Yes
Three-Stated
Transfer Type 0
TT0
Output
High
Yes
Three-Stated
Transfer Modifier
TM2–TM0
Output
High
Yes
Three-Stated
Transfer Line Number
TLN1,TLN0
Output
High
Yes
Three-Stated
User-Programmable Attributes
UPA1,UPA0
Output
High
Yes
Three-Stated
Read/Write
R/W
Output
High/Low
Yes
Three-Stated
Transfer Size
SIZ1,SIZ0
Output
High
Yes
Three-Stated
Bus Lock
LOCK
Output
Low
Yes
Three-Stated
Bus Lock End
LOCKE
Output
Low
Yes
Three-Stated
Cache Inhibit Out
CIOUT
Output
Low
Yes
Three-Stated
Byte Select
BS3–BS0
Output
Low
Yes
Three-Stated
Transfer Start
TS
Input/Output
Low
Yes
Three-Stated
Transfer in Progress
TIP
Output
Low
Yes
Three-Stated
Starting Termination Acknowledge Signal Sampling
SAS
Output
Low
Yes
Three-Stated
Transfer Acknowledge
TA
Input
Low
—
Transfer Retry Acknowledge
TRA
Input
Low
—
Transfer Error Acknowledge
TEA
Input
Low
—
Transfer Burst Inhibit
TBI
Input
Low
—
Transfer Cache Inhibit
TCI
Input
Low
—
Snoop Control
SNOOP
Input
Low
—
Bus Request
BR
Output
Low
No
Negated
Bus Grant
BG
Input
Low
—
Bus Grant Relinquish Control
BGR
Input
Low
—
Bus Busy
BB
Input/Output
Low
Yes
Three-Stated
Bus Tenure Termination
BTT
Input/Output
Low
Yes
Three-Stated
Cache Disable
CDIS
Input
Low
—
MMU Disable
MDIS
Input
Low
—
Reset In
RSTI
Input
Low
—
Reset Out
RSTO
Output
Low
No
Negated
Interrupt Priority Level
IPL2–IPL0
Input
Low
—
Interrupt Pending
IPEND
Output
Low
No
Negated
Autovector
AVEC
Input
Low
—
Processor Status
PST4–PST0
Output
High
No
10000
Processor Clock
CLK
Input
—
Clock Enable
CLKEN
Input
Low
—
JTAG Enable
JTAG
Input
Low
—
Test Clock
TCK
Input
—
Test Mode Select
TMS
Input
High
—
Test Data Input
TDI
Input
High
—
Test Data Output
TDO
Output
High
Yes
Three-Stated
Test Reset
TRST
Input
Low
—
Thermal Resistor Connections
THERM1,
THERM0
——
—
Power Supply
VCC
Input
—
Ground
GND
Input
—