Motorola MC68030 User Manual

Signal Description
MOTOROLA MC68030 USER’S MANUAL 5-3
Table 5-1. Signal Index (Sheet 2 of 2)
Signal Name Mnemonic Function
Data Transfer and
Size Acknowledge
DSACK0
/
DSACK1
Bus response signals that indicate the requested data transfer operation
is completed. In addition, these two lines indicate the size of the external
bus port on a cycle-by-cycle basis and are used for asynchronous
transfers.
Synchronous
Termination
STERM
Bus response signal that indicates a port size of 32 bits and that data
may be latched on the next falling clock edge.
Cache Inhibit In CIIN
Prevents data from being loaded into the MC68030 instruction and data
caches.
Cache Inhibit Out CIOUT
Reflects the CI bit in ATC entries or TTx register; indicates that external
caches should ignore these accesses
Cache Burst Request CBREQ
Indicates a burst request for the instruction or data cache.
Cache Burst
Acknowledge
CBACK
Indicates that the accessed device can operate in burst mode.
Interrupt Priority Level IPL0
–IPL2 Provides an encoded interrupt level to the processor.
Interrupt Pending IPEND
Indicates that an interrupt is pending.
Autovector AVEC
Requests an autovector during an interrupt acknowledge cycle.
Bus Request BR
Indicates that an external device requires bus mastership.
Bus Grant BG
Indicates that an external device may assume bus mastership.
Bus Grant Acknowledge BGACK
Indicates that an external device has assumed bus mastership.
Reset RESET
System reset.
Halt HALT
Indicates that the processor should suspend bus activity.
Bus Error BERR
Indicates that an erroneous bus operation is being attempted.
Cache Disable CDIS
Dynamically disables the on-chip cache to assist emulator support.
MMU Disable MMUDIS
Dynamically disables the translation mechanism of the MMU.
Pipe Refill REFILL
Indicates when the MC68030 is beginning to fill pipeline.
Microsequencer Status STATUS
Indicates the state of the microsequencer
Clock CLK Clock input to the processor.
Power Supply V
CC
Power supply.
Ground GND Ground connection

Motorola MC68030 Specifications

General

Brand	Motorola
Model	MC68030
Category	Computer Hardware
Language	English