參數(shù)資料
型號(hào): XRT75R06IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述: DATACOM, PCM TRANSCEIVER, PBGA217
封裝: 23 X 23 MM, BGA-217
文件頁數(shù): 43/63頁
文件大?。?/td> 350K
代理商: XRT75R06IB
á
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75R06
REV. 1.0.0
40
6.2
The XRT75R06 offers three loopback modes for diagnostic purposes. The loopback modes are selected via
the RLB_n and LLB_n bits n the Channel control registers select the loopback modes.
6.2.1
ANALOG LOOPBACK
In this mode, the transmitter outputs TTIP_n and TRing_n are internally connected to the receiver inputs
RTIP_n and RRing_n as shown in Figure 31. Data and clock are output at RxClk_n, RxPOS_n and RxNEG_n
pins for the corresponding transceiver. Analog loopback exercises most of the functional blocks of the device
including the jitter attenuator which can be selected in either the transmit or receive path.
LOOPBACKS
N
OTES
:
1.
2.
In the Analog loopback mode, data is also output via TTIP_n and TRing_n pins.
Signals on the RTIP_n and RRing_n pins are ignored during analog loopback.
F
IGURE
31. A
NALOG
L
OOPBACK
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxClk
TxNEG
TxClk
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
A
J
A
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
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