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[Previous] [Up] [Top] [Contents] [Back]Chapter 1 General Information
The CC92 isolated digital input board is a VME slave module. The module only decodes address lines A1 to A15 and only responds when receiving the address modifier codes $29 and/or $2D (short supervisory/non-privileged I/O access).
The module appears to the system as 32 byte locations which can be placed on every 32 byte boundary in the 64 kByte short address space.
The module consists of 4 fully independent channels with 8 inputs each. Each channel is capable to detect a change in any of its input lines and may generate an interrupt when it detects such a change. For the B type modules, the change of state circuit is replaced with a circuit that compares the input pattern with a defined pattern and may generate an interrupt when a match is detected. The used interrupter module is a MC68153 (BIM) which has a software programmable interrupt level, interrupt vector and interrupt mask for each of the four channels.
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