参数资料
型号: DS21Q42T+
厂商: Maxim Integrated Products
文件页数: 43/116页
文件大小: 0K
描述: IC FRAMER ENHANCED T1 4X 128TQFP
标准包装: 72
控制器类型: T1 调帧器
接口: 并行/串行
电源电压: 2.97 V ~ 3.63 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: 128-LQFP
供应商设备封装: 128-LQFP(14x20)
包装: 管件
DS21Q42
32 of 116
Framer Loopback
When CCR1.0 is set to a one, the DS21Q42 will enter a Framer LoopBack (FLB) mode. This loopback is
useful in testing and debugging applications. In FLB, the DS21Q42 will loop data from the transmit side
back to the receive side. When FLB is enabled, the following will occur:
1) An unframed all 1’s code will be transmitted at TPOS and TNEG.
2) Data at RPOS and RNEG will be ignored.
3) All receive side signals will take on timing synchronous with TCLK instead of RCLK.
Please note that it is not acceptable to have RCLK tied to TCLK during this loopback because this will
cause an unstable condition.
CCR2: COMMON CONTROL REGISTER 2 (Address=38 Hex)
(MSB)
(LSB)
TFM
TB8ZS
TSLC96
TZSE
RFM
RB8ZS
RSLC96
RZSE
SYMBOL
POSITION
NAME AND DESCRIPTION
TFM
CCR2.7
Transmit Frame Mode Select.
0 = D4 framing mode
1 = ESF framing mode
TB8ZS
CCR2.6
Transmit B8ZS Enable.
0 = B8ZS disabled
1 = B8ZS enabled
TSLC96
CCR2.5
Transmit SLC–96 / Fs–Bit Insertion Enable. Only set this bit to
a one in D4 framing applications. Must be set to one to source the
Fs pattern. See Section 15 for details.
0 = SLC–96/Fs–bit insertion disabled
1 = SLC–96/Fs–bit insertion enabled
TZSE
CCR2.4
Transmit FDL Zero Stuffer Enable. Set this bit to zero if using
the internal HDLC/BOC controller instead of the legacy support for
the FDL. See Section 15 for details.
0 = zero stuffer disabled
1 = zero stuffer enabled
RFM
CCR2.3
Receive Frame Mode Select.
0 = D4 framing mode
1 = ESF framing mode
RB8ZS
CCR2.2
Receive B8ZS Enable.
0 = B8ZS disabled
1 = B8ZS enabled
RSLC96
CCR2.1
Receive SLC–96 Enable. Only set this bit to a one in D4/SLC–96
framing applications. See Section 15 for details.
0 = SLC–96 disabled
1 = SLC–96 enabled
RZSE
CCR2.0
Receive FDL Zero Destuffer Enable. Set this bit to zero if using
the internal HDLC/BOC controller instead of the legacy support for
the FDL. See Section 15 for details.
0 = zero destuffer disabled
1 = zero destuffer enabled
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