Motorola MVME712AM Installation guide Download

Functional Description
Data Bus Structure
The local data bus on the MVME162 is a 32-bit synchronous bus that is based
on the MC68040 bus, and which supports burst transfers and snooping. The
various local bus master and slave devices use the local bus to communicate.
The local bus is arbitrated by priority type arbiter and the priority of the local
bus masters from highest to lowest is: 82596CA LAN, 53C710 SCSI, VMEbus,
and MPU. Generally speaking, any master can access any slave; however, not
all combinations pass the common sense test. Refer to the MVME162 Embedded
Controller Programmer’s Reference Guide and to the user’s guide for each device
to determine its port size, data bus connection, and any restrictions that apply
when accessing the device.
MC68040 or MC68LC040 MPU
The MC68040 or MC68LC040 processor is used on the MVME162. The
MC68040 has on-chip instruction and data caches and a floating point
processor. The major difference between the two processors is that the
MC68040 has a floating point coprocessor. Refer to the M68040 Microprocessor
User’s Manual for more information.
MC68xx040 Cache
The MVME162 local bus masters (VMEchip2, MC68xx040, 53C710 SCSI
controller, and 82596CA Ethernet controller) have programmable control of
the snoop/caching mode. The MVME162 local bus slaves which support
MC68xx040 bus snooping are defined in the Local Bus Memory Map table later
in this chapter.
No-VMEbus-Interface Option
The MVME162 can be operated as an embedded controller without the
VMEbus interface. To support this feature, certain logic in the VMEchip2 has
been duplicated in the MCchip. This logic is inhibited in the MCchip if the
VMEchip2 is present. The enables for these functions are controlled by
software and MCchip hardware initialization.
Contact your local Motorola sales office for ordering information.