XRT72L13 Datasheet, PDF (342/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
áç
PRELIMINARY
“RxDS3 Interrupt Enable” Register, as illustrated be-
low.
RXDS3 INTERRUPT ENABLE REGISTER (ADDRESS = 0X12)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
CP Bit Error
Interrupt
Enable
LOS
Interrupt
Enable
AIS
Interrupt
Enable
Idle Interrupt
Enable
FERF
Interrupt
Enable
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
BIT 2
AIC
Interrupt
Enable
R/W
0
BIT 1
OOF
Interrupt
Enable
R/W
0
BIT 0
P-Bit Error
Interrupt
Enable
R/W
0
Setting this bit-field to “1” enables this interrupt. Con-
versely, setting this bit-field to “0” disables this inter-
rupt.
Servicing the “Change of State” on Receive OOF
Interrupt
Whenever the XRT72L13 Framer IC detects this in-
terrupt, it will do all of the following.
• It will assert the Interrupt Request output pin (INT*)
by driving this pin “LOW”.
• It will set Bit 1 (OOF Interrupt Status), within the
“RxDS3 Interrupt Status” Register to “1”, as indi-
cated below.
RXDS3 INTERRUPT STATUS REGISTER (ADDRESS = 0X13)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
CP-Bit Error
Interrupt
Status
LOS
Interrupt
Status
AIS
Interrupt
Status
Idle Interrupt
Status
FERF
Interrupt
Status
AIC
Interrupt
Status
OOF
Interrupt
Status
P-Bit Error
Interrupt
Status
RUR
RUR
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
1
0
Whenever the Terminal Equipment encounters a
“Change in OOF on Receive” Interrupt, then it should
do the following.
1. It should determine the current state of the “OOF”
condition. Recall, that this interrupt can gener-
ated, whenever the XRT72L13 Framer declares
or clears the OOF defects. Hence, the user can
determine the current state of the OOF defect by
reading the state of Bit 4 (RxOOF), within the
“RxDS3 Configuration & Status” Registers, as
illustrated below.
RXDS3 CONFIGURATION & STATUS REGISTER (ADDRESS = 0X10)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RxAIS
RxLOS
RxIdle
RxOOF
Reserved
Framing On
Parity
FSync
Algo
MSync
Algo
RO
RO
RO
RO
RO
RO
RO
RUR
0
0
0
0
0
0
0
0
If OOF is “TRUE”.
1. It should transmit a FERF (Far-End Receive Fail-
ure) to the “Remote Terminal Equipment”. The
XRT72L13 Framer IC automatically supports this
action via the “FERF-upon-OOF” feature.
2. It should transmit the appropriate FEAC Message
(per Bellcore GR-499-CORE), to the Remote Ter-
minal, indicating that a “Service Affecting” condi-
tion has been detected in the Local Terminal
Equipment.
if OOF is “FALSE”
330