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FOXBORO FBM221 Channel input card

The onboard real-time clock (RTC) is backed up with a selfcontained battery. Before shipment of this board, the clock of the RTC device was stopped to preserve battery life. The board’s “Selftests” (ST) and operating systems require the clock of the RTC to be operating. Table 3-15 shows the steps required to initialize the RTC, depending on the mode. Examining and/or Changing Environmental Parameters Use the 167Bug’s ENV command to verify the NVRAM (BBRAM) parameters, and optionally use ENV to make changes to the Environmental parameters. Refer to Appendix A for the Environment parameters.

Backplane Power Connections

The MVME167 needs to draw power from both P1 and P2 of the VMEbus backplane. P2 is also used for the upper 16 bits of data for 32-bit transfers, and for the upper 8 address lines for extended addressing mode. The MVME167 may not operate properly without its main board connected to P1 and P2 of the VMEbus backplane.Whether the MVME167 operates as a VMEbus master or as a VMEbus slave, it is configured for 32 bits of address and for 32 bits of data (A32/D32). However, it handles A16 or A24 devices in certain address ranges. D8 and/or D16 devices in the system must be handled by the MC68040 software.

DRAM Addressing

The MVME167 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 as programmed by the MVME167Bug firmware. This may be changed, by software, to any other base address. Refer to the Single Board Computer Programmer's Reference Guide for details. Global Bus Timeout If the MVME167 tries to access offboard resources in a non-existent location, and is not system controller, and if the system does not have a global bus timeout, the MVME167 waits forever for the VMEbus cycle to complete. This would cause the system to hang up.

product application

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