
IDT82P2281
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Functional Description
46
August 20, 2009
pared if the Sa6SYN bit is ‘1’. If a matched code is detected, the
corresponding indication bit in the Sa6 Code Indication register will be
set.
3.8.2.4
V5.2 Link
The V5.2 link ID signal, i.e., 2 out of 3 sliding Sa7 bits being logic 0,
is detected with the indication in the V52LINKV bit. This detection is dis-
abled when the Basic Frame is out of synchronization.
3.8.2.5
Interrupt Summary
The interrupt sources in this block are summarized in
Table 20.When there are conditions meeting the interrupt sources, the corre-
sponding Status bit will be asserted high. When there is a transition
(from ‘1’ to ‘0’ or from ‘0’ to ‘1’) on the Status bit, the corresponding Sta-
tus Interrupt Indication bit will be set to ‘1’ (If the Status bit does not
exist, the source will cause its Status Interrupt Indication bit to ‘1’
directly) and the Status Interrupt Indication bit will be cleared by a write
signal. A ‘1’ in the Status Interrupt Indication bit means an interrupt
occurred. The interrupt will be reported by the INT pin if its Status Inter-
rupt Enable bit is ‘1’.
Table 20: Interrupt Source In E1 Frame Processor
Sources
Status Bit
Interrupt Indication Bit
Interrupt Enable Bit
In CRC to Non-CRC inter-working.
C2NCIWV
C2NCIWI
C2NCIWE
It is out of Basic frame synchronization.
OOFV
OOFI
OOFE
It is out of CRC multi-frame synchronization.
OOCMFV
OOCMFI
OOCMFE
It is out of CAS Signaling multi-frame synchronization.
OOSMFV
OOSMFI
OOSMFE
The new-found Basic frame alignment pattern position differs from the previous one.
-
COFAI
COFAE
FAS/NFAS Bit/Pattern Error occurs.
-
FERI
FERE
CRC Multi-Frame Alignment Pattern Error occurs.
-
CMFERI
CMFERE
CAS Signaling Multi-Frame Alignment Pattern Error occurs.
-
SMFERI
SMFERE
CRC-4 Error occurs.
-
CRCEI
CRCEE
Offline Basic frame search indication.
OOOFV
OOOFI
OOOFE
Far End Block Error occurs.
-
FEBEI
FEBEE
Continuous RAI & FEBE Error occurs.
RAICRCV
RAICRCI
RAICRCE
Continuous FEBE Error occurs.
CFEBEV
CFEBEI
CFEBEE
At the first bit of each CRC Multi-Frame.
-
ICMFPI
ICMFPE
At the first bit of each CRC Sub Multi-Frame.
-
ICSMFPI
ICSMFPE
At the first bit of each CAS Signaling Multi-Frame.
-
ISMFPI
ISMFPE
There is change in the corresponding SaX[1:4] bits. The ‘X’ is from 4 through 8.
-
Sa4I / Sa5I / Sa6I / Sa7I /
Sa8I
Sa4E / Sa5E / Sa6E /
Sa7E / Sa8E
Any 12 consecutive Sa6 bits or any 3 consecutive 4-bit Sa6 codewords are matched
with 0x888, 0xAAA, 0xCCC, 0xEEE or 0xFFF.
-
Sa6SCI
Sa6SCE
NT FEBE Error occurs.
-
TFEBEI
TFEBEE
NT CRC Error occurs.
-
TCRCEI
TCRCEE
2 out of 3 sliding Sa7 bits are received as logic 0.
V52LINKV
V52LINKI
V52LINKE