- 您现在的位置：买卖IC网 > PDF目录97867 > DS21FF44N (DALLAS SEMICONDUCTOR) DATACOM, FRAMER, PBGA300 PDF资料下载
参数资料
| 型号： | DS21FF44N |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PBGA300 |
| 封装： | 27 X 27 MM, BGA-300 |
| 文件页数： | 62/110页 |
| 文件大小： | 526K |
| 代理商： | DS21FF44N |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页当前第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页
DS21FT44/DS21FF44
55 of 110
14.2. HARDWARE BASED SIGNALING
Receive Side
In the receive side of the hardware based signaling, there are two operating modes for the signaling
buffer; signaling extraction and signaling re–insertion. Signaling extraction involves pulling the signaling
bits from the receive data stream and buffering them over a four multiframe buffer and outputting them in
a serial PCM fashion on a channel–by–channel basis at the RSIG output. This mode is always enabled.
In this mode, the receive elastic store may be enabled or disabled. If the receive elastic store is enabled,
then the backplane clock (RSYSCLK) must be 2.048 MHz. The ABCD signaling bits are output on
RSIG in the lower nibble of each channel. The RSIG data is updated once a multiframe (2 ms) unless a
freeze is in effect. See the timing diagrams in Section 22 for some examples.
The other hardware based signaling operating mode called signaling re–insertion can be invoked by
setting the RSRE control bit high (CCR3.3=1). In this mode, the user will provide a multiframe sync at
the RSYNC pin and the signaling data be re–aligned at the RSER output according to this applied
multiframe boundary in this mode, the elastic store must be enabled the backplane clock must be 2.048
MHz.
The signaling data in the two multiframe buffer will be frozen in a known good state upon either a loss of
synchronization (OOF event), carrier loss, or frame slip. To allow this freeze action to occur, the RFE
control bit (CCR2.0) should be set high. The user can force a freeze by setting the RFF control bit
(CCR2.1) high. Setting the RFF bit high causes the same freezing action as if a loss of synchronization,
carrier loss, or slip has occurred.
The 2 multiframe buffer provides an approximate 1 multiframe delay in the signaling bits provided at the
RSIG pin (and at the RSER pin if RSRE=1 via CCR3.3).
When freezing is enabled (RFE=1), the
signaling data will be held in the last known good state until the corrupting error condition subsides.
When the error condition sub-sides, the signaling data will be held in the old state for an additional 3 ms
to 5 ms before being allowed to be updated with new signaling data.
Transmit Side
Via the THSE control bit (CCR3.2), the DS21Q44 can be set up to take the signaling data presented at the
TSIG pin and insert the signaling data into the PCM data stream that is being input at the TSER pin. The
hardware signaling insertion capabilities of each framer are available whether the transmit side elastic
store is enabled or disabled. If the transmit side elastic store is enabled, the backplane clock (TSYSCLK)
must be 2.048 MHz.
When hardware signaling insertion is enabled on a framer (THSE=1), then the user must enable the
Transmit Channel Blocking Register Function Select (TCBFS) control bit (CCR3.6=1). This is needed so
that the CAS multiframe alignment word, multiframe remote alarm, and spare bits can be added to
timeslot 16 in frame 0 of the multiframe. The TS1 register should be programmed with the proper
information. If CCR3.6=1, then a zero in the TCBRs implies that signaling data is to be sourced from
TSER (or TSIG if CCR3.2=1) and a one implies that signaling data for that channel is to be sourced from
the Transmit Signaling (TS) registers. See definition below.
相关PDF资料 |
PDF描述 |
|---|---|
| DS21FT40N | DATACOM, FRAMER, PBGA300 |
| DS21FT40 | DATACOM, FRAMER, PBGA300 |
| DS21FT42 | DATACOM, FRAMER, PBGA300 |
| DS21FT42N | DATACOM, FRAMER, PBGA300 |
| DS21FF42 | DATACOM, FRAMER, PBGA300 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21FT40 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Four x Three 12 Channel E1 Framer |
| DS21FT40N | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS21FT42 | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 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 |
| DS21FT42N | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 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 |
| DS21FT44 | 功能描述:网络控制器与处理器 IC 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 |
发布紧急采购，3分钟左右您将得到回复。