XRT75R12DIB-F Exar Corporation, XRT75R12DIB-F Datasheet - Page 121

• Manufacturer Part Number: XRT75R12DIB-F
• Description: Peripheral Drivers & Components (PCIs) 12 Channel 3.3V-5V temp -45 to 85C
• Manufacturer: Exar Corporation

Specifications of XRT75R12DIB-F

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3.3 V to 5 V
• Package / Case: TBGA-420
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.3
To configure the LIU to operate in the correct mode for this application, the user must execute the following
configuration steps.
The user can configure a given channel (within the LIU) to operate in the DS3 Mode, by executing the following
step.
The user can accomplish this by clearing both Bits 2 (E3_n) and Bits 1 (STS-1/DS3*_n), within each of the
"Channel Control Registers" to "0" as depicted below.
Since the Mapper IC will typically output a single "Data Line" and a "Clock Line" for each DS3 signal that it
demaps from the incoming STS-N signal, it is imperative to configure each channel within the LIU to operate in
the Single Rail Mode.
The user can accomplish this by executing the following step.
The user can accomplish this by setting Bit 0 (SR/DR*), within the each of the "Channel Control" Registers to
"1", as illustrated below.
b. Configure the LIU to operate in the Single-Rail Mode
a. Configure the LIU to operate in the DS3 Mode
T
T
Using a particular clock edge within the "gapped" clock signal (from the Mapper IC) to sample and latch the
value of each DS3 data-bit that is output from the Mapper IC.
To (through the user of the Jitter Attenuator block) attenuate the jitter within this "DS3 data" and "clock signal"
that is output from the Mapper IC.
To convert this "smoothed" DS3 data and clock into industry-compliant DS3 pulses, and to output these
pulses onto the line.
If the LIU has been configured to operate in the Host Mode
ABLE
ABLE
If the LIU has been configured to operate in the Host Mode
B
B
R/O
R/O
IT
IT
0
0
45: C
46: C
7
7
Unused
Unused
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
HANNEL
HANNEL
B
B
R/O
R/O
IT
IT
0
0
C
C
6
6
ONTROL
ONTROL
PRBS Enable
PRBS Enable
R
R
Ch_n
Ch_n
B
B
R/W
R/W
EGISTER
EGISTER
IT
IT
0
0
5
5
- C
- C
HANNEL N
HANNEL N
RLB_n
RLB_n
B
B
R/W
R/W
IT
IT
0
0
4
4
117
, A
, A
DDRESS
DDRESS
LLB_n
LLB_n
B
B
R/W
R/W
IT
IT
0
0
3
3
L
L
OCATION
OCATION
E3_n
E3_n
B
B
R/W
R/W
; 0
; 0
IT
IT
0
0
2
2
XM
XM
6 (
6 (
M
M
STS-1/DS3_n
= 0-5 & 8-D) (
= 0-5 & 8-D) (
DS3
STS-1/
B
B
R/W
R/W
IT
IT
0
0
_n
1
1
XRT75R12D
N
N
SR/DR_n
SR/DR_n
= [0:11])
= [0:11])
B
B
R/W
R/W
IT
IT
0
1
0
0