5- 16 M68040 USER’S MANUAL MOTOROLA
5.14 SIGNAL SUMMARY
Table 5-7 provides a summary of the electrical characteristics of the signals discussed in
this section.
Table 5-7. Signal Summary
Signal Name Mnemonic Type Active Three-State
Address Bus A31–A0 Input/Output High Yes
Autovector AVEC Input Low —
Bus Busy BB Input/Output Low Yes
Bus Clock BCLK Input — —
Bus Grant BG Input Low —
Bus Request BR Output Low No
Cache Disable CDIS Input Low —
Cache Inhibit Out CIOUT Output Low Yes
Data Bus D31–D0 Input/Output High Yes
Data Latch Enable1DLE Input High —
Ground GND Ground — —
Interrupt Pending IPEND Output Low No
Interrupt Priority Level2IPL2–IPL0 Input Low —
Bus Lock LOCK Output Low Yes
Bus Lock End LOCKE Output Low Yes
Memory Inhibit MI Output Low No
MMU Disable3MDIS Input Low —
Processor Clock PCLK Input — —
Processor Status PST3–PST0 Output High No
Read/Write R/WInput/Output High/Low Yes
Reset In RSTI Input Low —
Reset Out RSTO Output Low No
Snoop Control SC1, SC0 Input High —
Transfer Acknowledge TA Input/Output Low Yes
Transfer Burst Inhibit TBI Input Low —
Transfer Cache Inhibit TCI Input Low —
Transfer Error Acknowledge TEA Input Low —
Transfer in Progress TIP Output Low Yes
Transfer Line Number TLN1, TLN0 Output High Yes
Transfer Modifier TM2–TM0 Output High Yes
Transfer Size SIZ1, SIZ0 Input/Output High Yes
