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参数资料
| 型号： | DS21Q42TN |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PQFP128 |
| 封装： | TQFP-128 |
| 文件页数： | 51/119页 |
| 文件大小： | 1309K |
| 代理商： | DS21Q42TN |
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DS21Q42
37 of 119
CCR7: COMMON CONTROL REGISTER 7 (Address=0A Hex)
(MSB)
(LSB)
-
RLB
RESR
TESR
-
SYMBOL
POSITION
NAME AND DESCRIPTION
–
CCR7.7
Not Assigned. Should be set to zero when written to.
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 force the receive elastic store to a depth of one frame. Receive
data is lost during the reset. Should be toggled after RSYSCLK has
been applied and is stable. Do not leave this bit set high.
TESR
CCR7.4
Transmit Elastic Store Reset. Setting this bit from a zero to a one
will force the transmit elastic store to a depth of one frame.
Transmit data is lost during the reset. Should be toggled after
TSYSCLK has been applied and is stable. Do not leave this bit set
high.
–
CCR7.3
Not Assigned. Should be set to zero when written to.
–
CCR7.2
Not Assigned. Should be set to zero when written to.
–
CCR7.1
Not Assigned. Should be set to zero when written to.
–
CCR7.0
Not Assigned. Should be set to zero when written to.
Remote Loopback
When CCR7.6 is set to a one, the DS21Q42 will be forced into Remote LoopBack (RLB). In this
loopback, data input via the RPOS and RNEG pins will be transmitted back to the TPOS and TNEG pins.
Data will continue to pass through the receive side framer of the DS21Q42 as it would normally and the
data from the transmit side formatter will be ignored. Please see Figure 1-1 for more details.
7. STATUS AND INFORMATION REGISTERS
There is a set of nine registers per channel that contain information on the current real time status of a
framer in the DS21Q42, Status Register 1 (SR1), Status Register 2 (SR2), Receive Information Registers
1 to 3 (RIR1/RIR2/RIR3) and a set of four registers for the onboard HDLC and BOC controller. The
specific details on the four registers pertaining to the HDLC and BOC controller are covered in Section
15 but they operate the same as the other status registers in the DS21Q42 and this operation is described
below.
When a particular event has occurred (or is occurring), the appropriate bit in one of these nine registers
will be set to a one. All of the bits in SR1, SR2, RIR1, RIR2, and RIR3 registers operate in a latched
fashion. This means that if an event or an alarm occurs and a bit is set to a one in any of the registers, it
will remain set until the user reads that bit. The bit will be cleared when it is read and it will not be set
again until the event has occurred again (or in the case of the RBL, RYEL, LRCL, and RLOS alarms, the
bit will remain set if the alarm is still present). There are bits in the four HDLC and BOC status registers
that are not latched and these bits are listed in Section 15.
相关PDF资料 |
PDF描述 |
|---|---|
| DS21Q42T | DATACOM, FRAMER, PQFP128 |
| DS21Q43AT | DATACOM, FRAMER, PQFP128 |
| DS21Q44T | DATACOM, FRAMER, PQFP128 |
| DS21Q44TN | DATACOM, FRAMER, PQFP128 |
| DS21Q48N | DATACOM, PCM TRANSCEIVER, PBGA144 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21Q43A | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad E1 Framer |
| DS21Q43AT | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q43AT+ | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q43ATN | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad E1 Framer |
| DS21Q43-ATN | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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