WOODWARD 5466-458 Digital expansion card

Other CPUs on the VMEbus can interrupt, disable, communicate with and determine the operational status of the RISC processor(s). One register of the GCSR set includes four bits which function as location monitors to allow one MVME188A processor to broadcast a signal to other MVME188A processors, if any. All eight registers are accessible from any local processor as well as from the VMEbus

This chapter provides necessary information to use the MVME188A module in a system configuration. This includes controls and indicators, memory map details, and software initialization of the module.

Controls and Indicators 

The MVME188A module has ABORT and RESET switches, and FAIL, HALT, and RUN indicators, all located on the front panel of the system controller board of the module (the,left-most of the front panels). (See Figure 2-1.) (Refer to Chapter 2 for front-panel configuration switches 53 and 54.) There is also a MEM ERROR indicator located on the front panel of the 32MB ECC memory board, if it is used in your MVME188A.ABORT is a momentary-action switch used to generate a local interrupt to the processor when it is pressed (not pressed = 1, pressed = 0). The button is debounced and fed to an edge-detector. The edge-detector output (the assertion of the ABORT bit in the !STATE register, a O-to-1 transition) is used to generate the ABRT interrupt request. The ABRT interrupt is used to gain access to the 188Bug debugger firmware located in the MVME188A EPROMs. Refer to interrupt details in Chapter 4.

RESET Switch S2 

RESET is a momentary-action switch which, when pressed, if MVME188A is VMEbus system controller, generates a local and VMEbus system reset (SRST) that is asserted for 200 ms from the time that the switch is released. If the MVME188A is not the system controller, the RESET switch generates only a local reset (LRST); it is also asserted for 200 ms from the time that the switch is released. (Not pressed = 1, pressed = 0.) The switch is fully debounced in hardware. The Software Initialization section later in this chapter has reset details.

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