参数资料
型号: DS21552GN
厂商: Maxim Integrated Products
文件页数: 118/137页
文件大小: 0K
描述: IC TXRX T1 1-CHIP 5V 100-BGA
标准包装: 1
功能: 单芯片收发器
接口: E1,HDLC,J1,T1
电路数: 1
电源电压: 4.75 V ~ 5.25 V
电流 - 电源: 75mA
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 100-LFBGA,CSPBGA
供应商设备封装: 100-CSBGA(10x10)
包装: 托盘
包括: DSX-1 和 CSU 线路补偿发生器,HDLC 控制器,带内回路代码发生器和检测器
DS21352/DS21552
81 of 137
The framer also contains a zero destuffer which is controlled via the CCR2.0 bit. In both ANSI T1.403
and TR54016, communications on the FDL follows a subset of a LAPD protocol. The LAPD protocol
states that no more than 5 ones should be transmitted in a row so that the data does not resemble an
opening or closing flag (01111110) or an abort signal (11111111). If enabled via CCR2.0, the
DS21352/552 will automatically look for 5 ones in a row, followed by a zero. If it finds such a pattern, it
will automatically remove the zero. If the zero destuffer sees six or more ones in a row followed by a
zero, the zero is not removed. The CCR2.0 bit should always be set to a one when the DS21352/552 is
extracting the FDL. More on how to use the DS21352/552 in FDL applications in this legacy support
mode is covered in a separate Application Note.
RFDL: RECEIVE FDL REGISTER (Address=28 Hex)
(MSB)
(LSB)
RFDL7
RFDL6
RFDL5
RFDL4
RFDL3
RFDL2
RFDL1
RFDL0
SYMBOL
POSITION
NAME AND DESCRIPTION
RFDL7
RFDL.7
MSB of the Received FDL Code
RFDL0
RFDL.0
LSB of the Received FDL Code
The Receive FDL Register (RFDL) reports the incoming Facility Data Link (FDL) or the incoming Fs bits. The LSB is
received first.
RFDLM1: RECEIVE FDL MATCH REGISTER 1 (Address=29 Hex)
RFDLM2: RECEIVE FDL MATCH REGISTER 2 (Address=2A Hex)
(MSB)
(LSB)
RFDL7
RFDL6
RFDL5
RFDL4
RFDL3
RFDL2
RFDL1
RFDL0
SYMBOL
POSITION
NAME AND DESCRIPTION
RFDL7
RFDL.7
MSB of the FDL Match Code
RFDL0
RFDL.0
LSB of the FDL Match Code
When the byte in the Receive FDL Register matches either of the two Receive FDL Match Registers (RFDLM1/RFDLM2),
SR2.2 will be set to a one and the INT will go active if enabled via IMR2.2.
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