MotorolA MVME162-013 module

                              MotorolA MVME162-013 module

The MVME162 draws power from VMEbus backplane connectors P1 and P2.

P2 is also used for the upper 16 bits of data in 32-bit transfers, and for the upper

8 address lines in extended addressing mode. The MVME162 may not function

properly without its main board connected to VMEbus backplane connectors

P1 and P2.

Whether the MVME162 operates as a VMEbus master or as a VMEbus slave, it

is configured for 32 bits of address and 32 bits of data (A32/D32). However, it

handles A16 or A24 devices in the address ranges indicated in Chapter 3. D8

and/or D16 devices in the system must be handled by the MC68040/

MC68LC040 software. Refer to the memory maps in Chapter 3.

The MVME162 contains shared onboard DRAM whose base address is

software-selectable. Both the onboard processor and offboard VMEbus

devices see this local DRAM at base physical address $00000000, as

programmed by the MVME162Bug firmware. This may be changed via

software to any other base address. Refer to the MVME162 Embedded Controller

Programmer’s Reference Guide for more information.

If the MVME162 tries to access offboard resources in a nonexistent location and

is not system controller, and if the system does not have a global bus timeout,

the MVME162 waits forever for the VMEbus cycle to complete. This will cause

the system to lock up. There is only one situation in which the system might

lack this global bus timeout: when the MVME162 is not the system controller

and there is no global bus timeout elsewhere in the system.

Multiple MVME162s may be installed in a single VME chassis. In general,

hardware multiprocessor features are supported.

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