Signal Description
5-6
MC68030 USER’S MANUAL
MOTOROLA
5.6.6 Data Strobe (DS
)
During a read cycle, this three-state output indicates that an external device should place
valid data on the data bus. During a write cycle, the data strobe indicates that the MC68030
has placed valid data on the bus. During two-clock synchronous write cycles, the MC68030
does not assert DS
. Refer to
7.1.5 Data Strobe
for more information about the relationship
of DS
to bus operation.
5.6.7 Data Buffer Enable (DBEN
)
This output is an enable signal for external data buffers. This signal may not be required in
all systems. The timing of this signal may preclude its use in a system that supports two-
clock synchronous bus cycles. Refer to
7.1.6 Data Buffer Enable
for more information
about the relationship of DBEN
to bus operation.
5.6.8 Data Transfer and Size Acknowledge (DSACK0
, DSACK1)
These inputs indicate the completion of a requested data transfer operation. In addition, they
indicate the size of the external bus port at the completion of each cycle. These signals apply
only to asynchronous bus cycles. Refer to
7.1.7 Bus Cycle Termination Signals
for more
information on these signals and their relationship to dynamic bus sizing.
5.6.9 Synchronous Termination (STERM
)
This input is a bus handshake signal indicating that the addressed port size is 32 bits and
that data is to be latched on the next falling clock edge for a read cycle. This signal applies
only to synchronous operation. Refer to
7.1.7 Bus Cycle Termination Signals
for more
information about the relationship of STERM
to bus operation.