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[Previous] [Up] [Top] [Contents] [Back]Chapter 1 General Information
The CC133 Twelve Channel Incremental Encoder Interface module is a VMEbus slave module. The module decodes the address lines A1 to A15 and 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 256 byte locations which can be placed on any 256 byte boundary in the 64 kbyte short I/O space.
The module consists of 12 input channels with four differential inputs each. The channels are grouped in four independent groups. Each group is based upon two CF32006 triple incremental encoder counters and has its own synchronization and control logic.
The power of the differential receivers of each group is supplied by a separate DC/DC converter and the outputs of the receivers are optically isolated from the inputs of the synchronization circuitry. An isolation of 500 V is maintained between the input groups and between a group and the system.
Each input channel has two Quadrature input signals, one Index input and one Digital input. The Index input may reset the corresponding counter and/or generate an interrupt. The polarity of the Index input is programmable.
The Index and the Digital input create a two bit digital input channel. Each group has 6 digital inputs. A change of a digital input line of a group can be detected and may generate an interrupt when a change is detected. The interrupter is a MC68153 Bus Interrupter Module (BIM) which has a software programmable interrupt level, interrupt vector and interrupt mask register for each of the four channel groups.
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