CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
111
CHAPTER 4 INTERFACES
4.1 Line
Interface
The line interface is used to connect an optical transceiver or receiver on the line side.
The following figure is an outline block diagram of the line interface of the
µ
PD98413. The transmit/receive clock
paths can be changed by setting pins and registers. This block consists of parallel-to-serial (MUX), serial-to-parallel
(DEMUX), TxPLL, and clock and data recovery unit (CDR).
Figure 4-1. Overview of
µµµµ
PD98413 line interface block
TxPLL
FRAMER0
TDOT0/
TDOC0
RDIT0/
RDIC0
RFCKTTL
CDR
DEMUX 0
1:8
MUX 0
8:1
CD0
CD
CNT
PORT 0
1
78MHz
78MHz
RFCKPLT/
RFCKPLC
2
3
LPFP
BIASC0
BIASP
LPFC0
Lock state
LPFPGND
LPFCGND0
CDVREF
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