CN8478/CN8474A/CN8472A/CN8471A
5.0 Memory Organization
Multichannel Synchronous Communications Controller (MUSYCC™)
5.2 Descriptors
Table 5-31. Interrupt Descriptor (1 of 4)
Bit
Field
Field
Name
Interrupt
Name
Value
Description
31
DIR
0
1
Receive.
Transmit.
30:29
GRP[1:0]
0–3
Least significant 2 bits of the Group Number. The most
significant group number is defined in bit 14.
28:24
23:20
CH[4:0]
0–31
Channel Number.
EVENT[3:0]
0
1
NONE
SACK
V
V
V
V
V
V
V
V
No event to report in this interrupt.
Service Request Acknowledge. Generated at conclusion of
service request which was processed successfully. In case
of an error as a result of a service request being executed,
other interrupts can be generated; for example, PERR.
2
3
EOB
V
V
V
V
V
V
V
V
V
V
End of Buffer. Generated when current data buffer has been
completely processed, and EOBI bit field in associated
Transmit Buffer Descriptor or Receive Buffer Descriptor is
set. Also, EOB interrupt reports the correct number of
transmitted bytes in BLEN field.(1)
EOM
End of Message. Generated when data buffer which was
just processed contained last octet of message. “Transmit
EOM” means the last bit of data (not including FCS or
closing FLAG) has been output on the serial port, and
“Receive EOM” means the entire HDLC frame (including
FCS and closing FLAG) has been written to shared memory
buffer.(1)
4
EOP
V
V
V
V
V
End of Padfill. Generated when the pad-count is enabled
with non-0 value in a transmit channel, and last idle code
octet is sent. This interrupt is conditioned on the end of
padfill-enabled bit being set in the Transmit Channel
Configuration Descriptor.
5
6
7
8
CHABT
CHIC
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Change To Abort Code. Generated when a received pad fill
code changes from 7Eh to FFh – abort code.
Change to Idle Code. Generated when a received pad fill
code changes from FFh to 7Eh – idle code.
FREC
SINC
Frame Recovery. Generated when serial port transitions
from Out-of-Frame (OOF) back to in-frame.
SS7 SUERM Octet Count Increment. Generated when in
SS7 mode and Signal Unit Error Rate Monitor counter
increments.
23:20
EVENT[3:0]
9
SDEC
SFILT
V
V
V
V
V
V
V
V
SS7 SUERM Octet Count Decrement. Generated when in
SS7 mode and Signal Unit Error Rate Monitor counter
decrements.
10
SS7 Filtered Message. Generated when in SS7 mode and
just-received message is identical to one previous
message. The current message is not written to shared
memory.
11-15
Reserved.
100660E
Conexant
5-41
CONEXANT [ CONEXANT SYSTEMS, INC ]
