
Epson Research and Development
Page 9
Vancouver Design Center
Interfacing to the Motorola MC68030 Microprocessor
S1D13706
Issue Date: 01/02/23
X31B-G-013-02
signals the start of a bus cycle by indicating a valid address has been placed on the bus. DS
(the data strobe) is used as a condition for valid data on the data bus. SIZ selects the active
portions of the data bus. R/W indicates a read or write operation.
Synchronous bus cycles operate much like asynchronous cycles except only 32-bit port
sizes are allowed. In this mode the DSACK signals are not required. Wait states are inserted
with the synchronous signal (STERM) which signals that the data is to be latched on the
next clock when asserted.