XRT72L13 Datasheet, PDF (351/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
• It will assert the “Interrupt Request” output pin
(INT*) by driving it “LOW”.
• It will set Bit 2 (RxFEAC Remove Interrupt Status),
within the “RxDS3 FEAC Interrupt Enable/Status”
Register to “1”, as indicated below.
RXDS3 FEAC INTERRUPT ENABLE/STATUS REGISTER (ADDRESS = 0X17)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
FEAC Valid
RxFEAC
Remove
Interrupt
Enable
RxFEAC
Remove
Interrupt
Status
RxFEAC
Valid
Interrupt
Enable
RxFEAC
Valid
Interrupt
Status
RO
RO
RO
RO
R/W
RUR
R/W
RUR
0
0
0
0
0
0
1
1
• It will write the delete contents of the most recently
“validated” FEAC Message from the “Rx DS3
FEAC” Register, as indicated below.
RXDS3 FEAC REGISTER (ADDRESS = 0X16)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Not Used
RxFEAC[5:0]
RO
RO
RO
RO
R/O
0
X
X
X
X
BIT 2
R/O
X
BIT 1
R/O
X
BIT 0
Not Used
R/O
0
4.3.6.2.11 The “Completion of Reception of a
LAPD Message” Interrupt
If the “Completion of Reception of a LAPD Message”
interrupt is enabled, then the XRT72L13 Framer IC
will generate an interrupt anytime the “Receive HDLC
Controller” block has received a new LAPD Message
buffer, from the Remote Terminal Equipment, and has
stored the contents of this message in the “Receive
LAPD Message” Buffer.
Enabling/Disable the “Receive LAPD Message”
Interrupt
The user can enable or disable the Receive LAPD
Message” Interrupt by writing the appropriate data in-
to Bit 1 (RxLAPD Interrupt Enable) within the “RxDS3
LAPD Control” Register, as indicated below.
RXDS3 LAPD CONTROL REGISTER (ADDRESS = 0X18)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
RxLAPD
Enable
RxLAPD
Interrupt
Enable
RxLAPD
Interrupt
Status
RO
RO
RO
RO
RO
R/W
R/W
RUR
0
0
0
0
0
0
X
0
Writing a “1” into this bit-field enables the “Receive
LAPD Message” Interrupt. Conversely, writing a “0”
into this bit-field disables the “Receive LAPD Mes-
sage” interrupt.
Servicing the “Receive LAPD Message” Interrupt
Whenever the XRT72L13 Framer IC generates this
interrupt, it will do the following.
• It will assert the “Interrupt Request” output pin
(INT*) by driving it “LOW”.
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