XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
PRELIMINARY
REV. P1.0.1
486
load Type value, then the XRT74L73 Framer IC will
generate this interrupt.
Enabling and Disabling the Detection of Payload
Type Mismatch Interrupt.
The user can enable or disable the Detection of Pay-
load Type Mismatch Interrupt by writing the appropri-
ate data into Bit 0 (RxPld Mis Interrupt Enable), within
the Rx E3 Interrupt Enable Register - 2, as indicated
below.
Setting this bit-field to “1 enables the Detection of
Payload Type Mismatch Interrupt. Conversely, set-
ting this bit-field to “0” disables the Detection of Pay-
load Type Mismatch Interrupt.
Servicing the Detection of Payload Type Mis-
match Interrupt
Whenever the XRT74L73 Framer IC generates this
interrupt, it will do the following.
It will assert the Interrupt Request output pin (INT)
by driving it “Low”.
It will set Bit 0 (RxPld Mis Interrupt Status), within
the Rx E3 Interrupt Enable Register -2 to “1”, as
indicated below.
6.3.6.2.12 The Receive LAPD Message Interrupt
If the Receive LAPD Message Interrupt is enabled,
then the XRT74L73 Framer IC will generate an inter-
rupt anytime the Receive HDLC Controller block has
received a new LAPD Message frame from the Re-
mote Terminal Equipment, and has stored the con-
tents of this message into the Receive LAPD Mes-
sage buffer.
Enabling/Disabling the Receive LAPD Message
Interrupt
The user can enable or disable the Receive LAPD
Message Interrupt by writing the appropriate data into
Bit 1 (RxLAPD Interrupt Enable) within the Rx E3
LAPD Control Register, as indicated below.
RXE3 CONFIGURATION & STATUS REGISTER 1 (ADDRESS = 0X10)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
RxPLDType[2:0]
RxFERF
Algo
RO
0
RxTMark
Algo
RO
0
RxPLDExp[2:0]
RO
0
RO
0
RO
0
R/W
0
R/W
0
R/W
0
RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Not Used
TTB
Change
Interrupt
Enable
R/W
0
Not Used
FEBE
Interrupt
Enable
FERF
Interrupt
Enable
BIP-8
Error Interrupt
Enable
Framing
Byte Error
Interrupt
Enable
R/W
0
RxPld
Mis
Interrupt
Enable
R/W
X
RO
0
RO
0
R/W
X
R/W
X
R/W
0
RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Not Used
TTB
Change
Interrupt
Status
RUR
0
Not Used
FEBE
Interrupt
Status
FERF
Interrupt
Status
BIP-8
Error Interrupt
Status
Framing
Byte Error
Interrupt
Status
RUR
0
RxPld
Mis
Interrupt
Status
RUR
0
RO
0
RO
0
RUR
1
RUR
0
RUR
0