WOODWARD 5500-559 Servo speed governor

VMEbus Slave Address Maps The VMEbus slave map consists of two parts: the A16 (short 1/0) map and the A24/A32 map. The GCSR and location monitors are the only resources that reside in the A16 map. There is a basic difference in mapping implementation between the A16 and A24/ A32 spaces. VMEbus A24 and A32 addresses are mapped to M bus addresses by the software-programmable VMEbus address decoder; VMEbus A16 addresses are mapped directly to the GCSR and location monitor addresses by switches. (Refer to the Hardware Configuration section in Chapter 2 for details.) Note that because the A16 map is configured by the hardware, the GCSR is immediately accessible from the VMEbus after reset. The A24 and A32 address decoders must be configured by the local CPU before any VMEbus A24 or A32 slave accesses can occur.

VMEbus A16 Slave Address Map

 The GCSR base address is determined by switches S3-5 through 53-8, 54-1 through 54-4 (GRPAD7 through GRPADO, respectively}, and 54-5 through 54-8 (BDAD3 through BDADO, respectively). The location monitor base address is determined by GRP AD7 through GRP ADO (the same switches used to set the GCSR base address). Each switch is turned on to set its corresponding address bit to a 0. Off represents a 1 address bit. Moving the switch lever to the left (closer to the PWB) turns the switch on; moving it to the right (away from the PWB) turns the switch off. (Refer to the Hardware Configuration section in Chapter 2 for details.)

Location Monitor Address Mapping 

There are four location monitors on the MVME188A. Each of them can cause an interrupt to any local CPU. The base address of the location monitors is determined by the setting of the GRP AD switches. Any access to a location monitor location causes the appropriate bit (LMO* through LM3•) to be asserted in the GCSR. The assertion of any of the location monitor bits in the GCSR causes an LMI interrupt to all processors that have LMI unmasked. Note that BDAD = %1111 is reserved for location monitor addresses; no MVME188A boards should be set up with this BOAD. (It is impossible to access any GCSR registers on an MVME188A with BOAD set to %1111 without setting a location monitor bit.) All MVME188A boards in the system that have.the same GRPAO respond to the same location monitor addresses.

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