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 — — —
