CN8478/CN8474A/CN8472A/CN8471A
6.0 Basic Operation
Multichannel Synchronous Communications Controller (MUSYCC™)
6.4 Protocol Support
Change to Abort
Code (CHABT)
Reason:
•
BLP detected received data changed from pad fill (7Eh) octets to abort
code (zero followed by seven consecutive 1s).
Effects:
•
•
Interrupt Descriptor in Interrupt Queue with EVENT = CHABT, DIR = 0
(if MSKIDLE = 0 in Receive Channel Configuration Descriptor).
BLP and DMAC continue with normal message processing.
Change to Idle Code (CHIC)
Reason:
•
BLP detected received data changed from abort code (0 followed by
seven 1s) to idle code (7Eh) octets.
Effects:
•
•
Interrupt Descriptor in Interrupt Queue with EVENT = CHIC, DIR = 0
(if MSKIDLE = 0 in Receive Channel Configuration Descriptor).
BLP and DMAC continue with normal message processing.
Frame Recovery (FREC)
Reason:
•
BLP detected that the serial interface has transitioned from an
out-of-frame to in-frame condition.
Effects:
•
•
Interrupt Descriptor in Interrupt Queue with EVENT = FREC, DIR = 0
(if MSKOOF = 0 in Group Configuration Descriptor).
BLP and DMAC continue with normal message processing.
SS7 SUERM Octet Count
Increment (SINC)
Reasons:
•
BLP incremented the SUERM counter. The channel is in SS7 mode. The
reasons for SUERM counter to increment include reception of a short
message, octet alignment error, FCS mismatch, or an accumulation of
octet count errors. Each of these conditions may also generate an interrupt.
Effects:
•
Interrupt Descriptor in Interrupt Queue with EVENT = SINC, DIR = 0
(if MSKSINC = 0 in Receive Channel Configuration Descriptor).
BLP and DMAC continue with normal message processing.
•
SS7 SUERM Octet Count
Decrement (SDEC)
Reasons:
•
BLP decremented the SUERM counter. The channel is in SS7 mode. The
SUERM counter decrements by one when MUSYCC receives 256
consecutive unerrored messages.
Effects:
•
Interrupt Descriptor in Interrupt Queue with EVENT = SDEC, DIR = 0
(if MSKSDEC = 0 in Receive Channel Configuration Descriptor).
BLP and DMAC continue with normal message processing.
•
SS7 Filtered Message
(SFILT)
Reason:
•
BLP detected an unerrored 3, 4, or 5 octet message identical to the
previous message. The channel is in SS7 mode.
100660E
Conexant
6-35
CONEXANT [ CONEXANT SYSTEMS, INC ]
