XRT91L32IQ-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L32IQ-F' PDF : 37 Pages View PDF
xr
REV. 1.0.2
XRT91L32
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
FIGURE 14. LOOP TIMING MODE USING INTERNAL CDR OR AN EXTERNAL RECOVERED CLOCK
REFCLKP
REFCLKN
TTLREFCLK
TXDI[7:0]
TXPCLK_IO
PIO_CTRL
LOOPTIME
CDRDIS
8
0
ENB
1
ENB
RXDO[7:0]
~
RXPCLKO
8
Div by 8
622.08/
155.52MHz
CMU
XRT91L32
MUX
PISO
Div by
8
DATA
CLK to Retimer
Retimer
CLK
SIPO
DATA
Clk
CDR
Data
TXOP
TXON
XRXCLKIP
XRXCLKIN
RXIP
RXIN
~
3.6 Transmit Serial Output Control
The 622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/STM-1 transmit serial output is avaliable on TXOP/N
pins. The transmit serial output can be AC or DC coupled to an optical module or electrical interface. A
simplified DC coupling block diagram is shown in Figure 15. (For AC-coupled applications, refer to application
FIGURE 15. TRANSMIT SERIAL OUTPUT INTERFACE BLOCK
TXOP
TXON
XRT91L32
STS-12/STM-4
or
STS-3/STM-1
Transceiver
+VDD
120
Optical Module
82
Install terminators as close to
optical module transmit pins
Optical Fiber
note TAN-9130.)
NOTE: Some optical modules integrate AC coupling capacitors within the module. AC or DC coupling is largely specific to
system design and optical module of choice.
25
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