Motorola MVME1X7P - Manual (Page 33)

Programming Interfaces
http://www.motorola.com/computer/literature 1-7
1
Programming Interfaces
The following sections describe the programming interface to devices on
the MVME167P and MVME177P single-board computers. Unless the
section specifies a particular board type, the discussion applies to both
models.
MC680X0 MPU
The MVME167P is based on the MC68040 microprocessor. The
MVME177P is based on the MC68060 microprocessor. Both processors
have on-chip instruction and data caches and a floating-point processor
(refer to the MC68040 and MC68060 user’s manuals for more
information).
Both models are available in various versions with the features listed in
Table 1-1 on page 1-3 .
Data Bus Structure
The local bus for all single-board computers described in this manual is a
32-bit synchronous bus, which is based on an MC68040-compatible bus
and which supports burst transfers. Throughout this manual this bus is
referred to as the Local Bus. The various Local Bus master and slave
devices use the Local Bus to communicate. The Local Bus is arbitrated by
priority type arbiter. The priority of the Local Bus masters from highest to
lowest is:
Highest priority 82596CA LAN
CD2401 serial (through the PCCchip2)
53C710 SCSI
VMEbus
Lowest priority MPU