参数资料
型号: DS2196LN+
厂商: Maxim Integrated Products
文件页数: 21/157页
文件大小: 0K
描述: IC FRAMER DUAL T1 LIU 100-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 90
控制器类型: T1 调帧器
接口: 并行/串行
电源电压: 3.135 V ~ 3.465 V
电流 - 电源: 85mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-LQFP
供应商设备封装: 100-LQFP(14x14)
包装: 托盘
DS2196
117 of 157
is written to the TFDL, it will be multiplexed serially (LSB first) into the proper position in the outgoing
T1 data stream. After the full 8 bits has been shifted out, the framer will signal the host microcontroller
that the buffer is empty and that more data is needed by setting the SR2.3 bit to a 1. The INT will also
toggle low if enabled via IMR2.3. The user has 2 ms to update the TFDL with a new value. If the TFDL
is not updated, the old value in the TFDL will be transmitted once again. The framer also contains a zero
stuffer, which is controlled via the CCR2.4 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 five 1’s
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 CCR2.4, the framer will automatically look for five 1’s in a
row. If it finds such a pattern, it will automatically insert a 0 after the five 1’s. The CCR2.0 bit should
always be set to a 1 when the framer is inserting the FDL. More on how to use the DS2196 in FDL
applications is covered in a separate Application Note.
TFDLA: TRANSMIT FDL REGISTER for FORMATTER A (Address = 7E Hex)
TFDLB: TRANSMIT FDL REGISTER for FORMATTER B (Address = FE Hex)
[Also used to insert Fs framing pattern in D4 framing mode; see Section 18.3]
(MSB)
(LSB)
TFDL7
TFDL6
TFDL5
TFDL4
TFDL3
TFDL2
TFDL1
TFDL0
SYMBOL
POSITION
NAME AND DESCRIPTION
TFDL7
TFDL.7
MSB of the FDL code to be transmitted
TFDL0
TFDL.0
LSB of the FDL code to be transmitted
The Transmit FDL Register (TFDL) contains the Facility Data Link (FDL) information that is to be
inserted on a byte basis into the outgoing T1 data stream. The LSB is transmitted first.
18.3D4/SLC–96 OPERATION
In the D4 framing mode, the framer uses the TFDL register to insert the Fs framing pattern. To allow the
device to properly insert the Fs framing pattern, the TFDL register at address 7Eh must be programmed to
1Ch and the following bits must be programmed as shown: TCR1.2=0 (source Fs data from the TFDL
register) CCR2.5=1 (allow the TFDL register to load on multiframe boundaries)
Since the SLC–96 message fields share the Fs–bit position, the user can access the message fields via the
TFDL and RFDL registers. Please see the separate Application Note for a detailed description of how to
implement a SLC–96 function.
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