参数资料
型号: DS21352LB
厂商: Maxim Integrated Products
文件页数: 75/137页
文件大小: 0K
描述: IC TXRX 1-CHIP T1 3.3V 100-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
产品变化通告: Product Discontinuation 20/Feb/2012
标准包装: 90
功能: 单芯片收发器
接口: HDLC,T1
电路数: 1
电源电压: 3.14 V ~ 3.47 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-LQFP
供应商设备封装: 100-LQFP(14x14)
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
42 of 137
CCR7: COMMON CONTROL REGISTER 7 (Address=0A Hex)
(MSB)
(LSB)
LIRST
RLB
RESR
TESR
LIUSI
CDIG
LIUODO
SYMBOL
POSITION
NAME AND DESCRIPTION
LIRST
CCR7.7
Line Interface Reset. Setting this bit from a zero to a one will initiate an internal reset
that affects the clock recovery state machine and jitter attenuator. Normally this bit is
only toggled on power–up. Must be cleared and set again for a subsequent reset.
RLB
CCR7.6
Remote Loopback.
0 = loopback disabled
1 = loopback enabled
RESR
CCR7.5
Receive Elastic Store Reset. Setting this bit from a zero to a one will minimize the
delay through the receive elastic store. Should be toggled after RSYSCLK has been
applied and is stable. See section 14.3 for details. Do not leave this bit set HIGH.
TESR
CCR7.4
Transmit Elastic Store Reset. Setting this bit from a zero to a one will maximize the
delay through the transmit elastic store. Transmit data is lost during the reset. Should be
toggled after TSYSCLK has been applied and is stable. See section 14.3for details. Do
not leave this bit set HIGH.
-CCR7.3
Reserved. Must be set low for proper operation.
LIUSI
CCR7.2
Line Interface Synchronization Interface Enable. This control bit determines whether
the line receiver should handle a normal T1 signal or a 1.544MHz synchronization signal.
This control has no affect on the line interface transmitter.
0 = line receiver configured to support a normal T1 signal
1 = line receiver configured to support a synchronization signal
CDIG
CCR7.1
Customer Disconnect Indication Generator. This control bit determines whether the
Line Interface will generate an unframed ...1010... pattern at TTIP and TRING instead of
the normal data pattern.
0 = generate normal data at TTIP & TRING as input via TPOSI & TNEGI
1 = generate a ...1010... pattern at TTIP and TRING
LIUODO
CCR7.0
Line Interface Open Drain Option. This control bit determines whether the TTIP and
TRING outputs will be open drain or not. The line driver outputs can be forced open
drain to allow 6Vpeak pulses to be generated or to allow the creation of a very low power
interface.
0 = allow TTIP and TRING to operate normally
1 = force the TTIP and TRING outputs to be open drain
6.6 REMOTE LOOPBACK
When CCR7.6 is set to a one, the DS21352/552 will be forced into Remote LoopBack (RLB). In this
loopback, data input via the RPOSI and RNEGI pins will be transmitted back to the TPOSO and TNEGO
pins. Data will continue to pass through the receive side framer of the DS21352/552 as it would normally
and the data from the transmit side formatter will be ignored. Please see Figure 3-1 for more details.
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