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IDT82P2281
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Functional Description
34
October 7, 2003
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.
It is out of Basic frame synchronization.
It is out of CRC multi-frame synchronization.
It is out of CAS Signaling multi-frame synchronization.
The new-found Basic frame alignment pattern position differs from the previous one.
FAS/NFAS Bit/Pattern Error occurs.
CRC Multi-Frame Alignment Pattern Error occurs.
CAS Signaling Multi-Frame Alignment Pattern Error occurs.
CRC-4 Error occurs.
Offline Basic frame search indication.
Far End Block Error occurs.
Continuous RAI & FEBE Error occurs.
Continuous FEBE Error occurs.
At the first bit of each CRC Multi-Frame.
At the first bit of each CRC Sub Multi-Frame.
At the first bit of each CAS Signaling Multi-Frame.
There is change in the corresponding SaX[1:4] bits. The ‘X’ is from 4 through 8.
C2NCIWV
OOFV
OOCMFV
OOSMFV
-
-
-
-
-
OOOFV
-
RAICRCV
CFEBEV
-
-
-
-
C2NCIWI
OOFI
OOCMFI
OOSMFI
COFAI
FERI
CMFERI
SMFERI
CRCEI
OOOFI
FEBEI
RAICRCI
CFEBEI
ICMFPI
ICSMFPI
ISMFPI
C2NCIWE
OOFE
OOCMFE
OOSMFE
COFAE
FERE
CMFERE
SMFERE
CRCEE
OOOFE
FEBEE
RAICRCE
CFEBEE
ICMFPE
ICSMFPE
ISMFPE
Sa4I / Sa5I / Sa6I / Sa7I /
Sa8I
Sa6SCI
Sa4E / Sa5E / Sa6E /
Sa7E / Sa8E
Sa6SCE
Any 12 consecutive Sa6 bits or any 3 consecutive 4-bit Sa6 codewords are matched
with 0x888, 0xAAA, 0xCCC, 0xEEE or 0xFFF.
NT FEBE Error occurs.
NT CRC Error occurs.
2 out of 3 sliding Sa7 bits are received as logic 0.
-
-
-
TFEBEI
TCRCEI
V52LINKI
TFEBEE
TCRCEE
V52LINKE
V52LINKV