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Board Level Hardware Description
1
MC68040 or MC68LC040 CPU
MC68 XX 040 Cache
No VMEbus Interface Option
1-14
The MC68040 or MC68LC040 processor is used on the MVME162LX.
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 user's
manual for additional information.
The MVME162LX local bus masters (VMEchip2, MC68XX040, 53C710
SCSI controller, and 82596CA Ethernet controller) have programmable
control of the snoop/caching mode. The MVME162LX local bus slaves
which support MC68XX040 bus snooping are defined in the Local Bus
Memory Map table later in this chapter.
The MVME162LX 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.
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