参数资料
型号: XRT72L71IQ
厂商: Exar Corporation
文件页数: 49/102页
文件大小: 0K
描述: IC FRAMER DS3 ATM UNI 160PQFP
产品变化通告: XRT72Lx Series Obsolescence 02/May/2012
标准包装: 24
控制器类型: DS3 ATM UNI,透明通道调帧器
电源电压: 3.3V
电流 - 电源: 120mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 160-BQFP
供应商设备封装: 160-PQFP(28x28)
包装: 托盘
XRT72L71
á
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
46
TABLE 1: UNI OPERATING MODE REGISTER
REGISTER 0
UNI OPERATING MODE REGISTER
HEX ADDRESS: 0X00
BIT
FUNCTION
TYPE
DEFAULT
DESCRIPTION-OPERATION
7
Local Loop-back
R/W
0
0: Local Loop-back Mode operation is disabled
1: Local Loop-back Mode operation is enabled. The Transmit stream on TxPOS,
TxNEG pins are looped back into the receive RxPOS, RxNEG pins
6
Cell Loop-back
R/W
0
0: Cell Loop-back Mode operation is disabled
1: Cell Loop-back Mode operation is enabled. Cells from the Receive Cell Pro-
cessor block are written into the Tx FIFO.
NOTE: This bit-field is only active if the XRT72L71 is operating in the ATM UNI
Mode.
5
PLCP Loop-back
R/W
0
0: PLCP Loop-back Mode operation is disabled
1: PLCP Loop-back Mode operation is enabled. PLCP frames are looped from
the Transmit PLCP Processor block into the Receive PLCP Processor Block.
NOTE: This bit-field is only active if the XRT72L71 is operating in the ATM UNI/
PLCP Mode.
4
RESET
R/W
0
0: Normal Operation
1: A “0” to “1” transition causes a reset of the UNI/Framer device.
3
Direct-mapped ATM
R/W
1
0: PLCP Mode is enabled. Transmit and Receive PLCP Processor blocks are
enabled.
1: Direct-Mapped ATM Mode. Transmit and Receive PLCP Processor blocks are
disabled.
NOTE: This bit-field is only active if the XRT72L71 is operating in the ATM UNI
Mode.
2
C-BIT/M13
R/W
0
0: XRT72L71 will support the “DS3/C-Bit Parity” Framing Format.
1: XRT72L71 will support the “DS3/M13” Framing Format.
1
Timing Reference
Select (1)
R/W
1
PLCP block
00: Transmitter timings taken from the Receive PLCP Processor (Loop-Timing).
01: 8 kHz reference signal on 8kRef pin used for stuffing and framing
10: StuffCtl is used for stuffing control, framing is asynchronous on power on
11: Fixed stuffing pattern is used. Framing is asynchronous on power on
Framer block
00: Transmitter timings are taken from the Receive DS3 Framer (Loop-Timing)
01: Framing is asynchronous on power-on, and TxInClk is used as the transmit
clock
10: Transmitter follows external pin (TxFrameRef) framing reference
11: Framin is asynchronous on power-on, and TxInClk is used as the transmit
clock
0
Timing Reference
Select (0)
R/W
1
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