6.0 Basic Operation
CN8478/CN8474A/CN8472A/CN8471A
6.4 Protocol Support
Multichannel Synchronous Communications Controller (MUSYCC™)
If the host wants to send any more data on that channel, the host must
reactivate any transparent mode transmit channel that has issued an ONR error.
Notice there is no mechanism for transparent mode channels to ever enter the
IDLE transmission state.
6.4.9.1 Transmit Events
Transmit events are informational and require no recovery actions.
Reason:
End of Buffer (EOB)
•
DMAC reached the end of a buffer by servicing a number of octets equal
to the BLEN bit field in a Transmit Buffer Descriptor. For the transparent
mode, EOM is not a valid event because there is no concept of messages.
Effects:
•
•
•
MUSYCC writes the Interrupt Descriptor in Interrupt Queue with
EVENT = EOB, DIR = 1 (per EOBI in Transmit Buffer Descriptor).
MUSYCC continues with normal transparent mode processing by
processing to the next message structure.
MUSYCC requires more data buffers.
6.4.9.2 Receive Events
Receive events are informational and require no recovery actions.
Reason:
End of Buffer (EOB)
•
BLP reached the end of a buffer by transferring into shared memory a
number of octets equal to the BLEN bit field in a Receive Buffer
Descriptor.
Effects:
•
MUSYCC writes the Interrupt Descriptor in Interrupt Queue with
EVENT = EOB, DIR = 0 (per EOBI in Receive Buffer Descriptor).
Reason:
BLP detects that the serial interface transitions from an out-of-frame to an
in-frame condition.
Effects:
Frame Recovery (FREC)
•
•
•
The Interrupt Descriptor in Interrupt Queue with EVENT = FREC,
DIR = 0 (per MSKOOF in Group Configuration Descriptor).
MUSYCC continues with normal transparent mode processing by
processing to the next message structure.
6-44
Conexant
100660E
CONEXANT [ CONEXANT SYSTEMS, INC ]
