CN8478 Datasheet, PDF (169/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
6.0 Basic Operation
6.4 Protocol Support
Change to Abort
Code (CHABT)
Change to Idle Code (CHIC)
Frame Recovery (FREC)
SS7 SUERM Octet Count
Increment (SINC)
SS7 SUERM Octet Count
Decrement (SDEC)
SS7 Filtered Message
(SFILT)
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.
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.
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.
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.
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.
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