MVME5100 Single Board Computer Installation and Use - Bustec

Preparation1System ConsiderationsThe MVME5100 draws power from the VMEbus backplane connectors P1and P2. Connector P2 is also used for the upper 16 bits of data in 32-bittransfers, and for the upper eight address lines in extended addressingmode. The MVME5100 will not function properly without its main boardconnected to VMEbus backplane connectors P1 and P2.Whether the MVME5100 operates as a VMEbus master or as a VMEbusslave, it is configured for 32 bits of address and 32 bits of data (A32/D32).However, it handles A16 or A24 devices in the appropriate address ranges.D8 and/or D16 devices in the system must be handled by the processorsoftware.If the MVME5100 tries to access off-board resources in a nonexistentlocation and if the system does not have a global bus time-out, theMVME5100 waits indefinitely for the VMEbus cycle to complete. Thiswill cause the system to lock up. There is only one situation in which thesystem might lack this global bus time-out; that is when the MVME5100is not the system controller and there is no global bus time-out elsewherein the system.NoteSoftware can also disable the bus timer by setting the appropriatebits in the Universe II VMEbus interface.Multiple MVME5100 boards may be installed in a single VME chassis;however, each must have a unique VMEbus address. Other MPUs on theVMEbus can interrupt, disable, communicate with, and determine theoperational status of the processor(s).http://www.motorola.com/computer/literature 1-7