4
1.1.1 BUS CONTROLLER FEATURES
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Implements all Message Formats and Error Checking
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Major and minor frame message structure.
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Simple setup and operation. Multiple minor frames, message tables and data tables. Only
one Major Frame Pointer Register is required to control unlimited number of messages
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BC initialized by writing to three Configuration Registers and the Interrupt Mask
Register
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Executes lists of messages via Minor Frame Pointers
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Configurable Global Retry and Message Specific Local Retry
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Programmable retries per message:
None
Retry Current Bus
Retry Alternate Bus
Retry Alternate Bus then Current Bus.
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Programmable response timeout of 14, 18, 26, or 42 microseconds.
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Programmable Intermessage Gap Time up to 4 mS with 2uS resolution.
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Programmable Synchronous Message Time up to 4mS with 2uS resolution.
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Extended Gap Time and Synchronous Message Time using NO- OP Feature.
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Programmable Minor Frame Gap with 64 us resolution.
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Programmable Interrupts for:
End of Message
End of Frame
Response Time Out, Message
Error
Message Retry
RT Status Bit Set
FIFO Overflow.
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Host controlled commands:
Start BC
Continuous Mode
Stop at End of Message
Stop at End of Frame
Abort,
GOTO Alternate Frame.
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Dynamic Message Bus Switch Upon Successful Retry.
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Synchronous or Asynchronous Messages.
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Synchronous or Asynchronous Minor Frames.
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Up to 63 autonomous data tables per message.
