ICS TRIPLEX 9401 Displacement drive clamp

The MVME2603/2604 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 eight address lines in extended addressing mode. The MVME2603/2604 may not function properly without its main board connected to VMEbus backplane connectors P1 and P2. Whether the MVME2603/2604 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 2, Operating Instructions. D8 and/or D16 devices in the system must be handled by the PowerPC processor software. Refer to the memory maps in Chapter 2, Operating Instructions.

The MVME2603/2604 contains 

shared onboard DRAM (and, optionally, secondary cache memory) 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 firmware. This may be changed via software to any other base address. Refer to the MVME2600 Series Single Board Computer Programmer’s Reference Guide, listed in Appendix D, Related Documentation, for more information. If the MVME2603/2604 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 MVME2603/2604 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 MVME2603/2604 is not the system controller and there is no global bus timeout elsewhere in the system

Multiple MVME2603/2604s may be installed in a single VME chassis. 

In general, hardware multiprocessor features are supported. Other MPUs on the VMEbus can interrupt, disable, communicate with, and determine the operational status of the processor(s). One register of the GCSR (global control/status register) set includes four bits that function as location monitors to allow one MVME2603/2604 processor to broadcast a signal to any other MVME2603/2604 processors. All eight registers are accessible from any local processor as well as from the VMEbus. The MVME2603/2604 VME module draws +5V DC, +12V DC, and –12V DC power from the VMEbus backplane through connectors P1 and P2. The 3.3V DC and the processor core voltage power is supplied by the on-board +5V DC.

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