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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： | 71/110页 |
| 文件大小： | 526K |
| 代理商： | DS21FF44N |
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DS21FT44/DS21FF44
63 of 110
TAF: TRANSMIT ALIGN FRAME REGISTER (Address=20 Hex)
(MSB)
(LSB)
Si
00
110
11
[Must be programmed with the 7 bit FAS word; the DS21Q44 does not automatically set these bits]
SYMBOL
POSITION
NAME AND DESCRIPTION
Si
TAF.7
International Bit.
0TAF.6
Frame Alignment Signal Bit.
0TAF.5
Frame Alignment Signal Bit.
1TAF.4
Frame Alignment Signal Bit.
1TAF.3
Frame Alignment Signal Bit.
0TAF.2
Frame Alignment Signal Bit.
1TAF.1
Frame Alignment Signal Bit.
1TAF.0
Frame Alignment Signal Bit.
TNAF: TRANSMIT NON–ALIGN FRAME REGISTER (Address=21 Hex)
(MSB)
(LSB)
Si
1
A
Sa4
Sa5
Sa6
Sa7
Sa8
[Bit 2 must be programmed to one; the DS21Q44 does not automatically set this bit]
SYMBOL
POSITION
NAME AND DESCRIPTION
Si
TNAF.7
International Bit.
1
TNAF.6
Frame Non–Alignment Signal Bit.
A
TNAF.5
Remote Alarm (used to transmit the alarm).
Sa4
TNAF.4
Additional Bit 4.
Sa5
TNAF.3
Additional Bit 5.
Sa6
TNAF.2
Additional Bit 6.
Sa7
TNAF.1
Additional Bit 7.
Sa8
TNAF.0
Additional Bit 8.
18.3. INTERNAL REGISTER SCHEME BASED ON CRC4 MULTIFRAME
On the receive side, there is a set of eight registers (RSiAF, RSiNAF, RRA, RSa4 to RSa8) that report the
Si and Sa bits as they are received. These registers are updated with the setting of the Receive CRC4
Multiframe bit in Status Register 2 (SR2.1). The host can use the SR2.1 bit to know when to read these
registers. The user has 2 ms to retrieve the data before it is lost. The MSB of each register is the first
received. Please see the register descriptions below and the Transmit Data Flow diagram in Section 22
for more details. On the transmit side, there is also a set of eight registers (TSiAF, TSiNAF, TRA, TSa4
to TSa8) that via the Transmit Sa Bit Control Register (TSaCR), can be programmed to insert both Si and
Sa data. Data is sampled from these registers with the setting of the Transmit Multiframe bit in Status
Register 2 (SR2.5). The host can use the SR2.5 bit to know when to update these registers. It has 2 ms to
update the data or else the old data will be retransmitted. The MSB of each register is the first bit
transmitted. Please see the register descriptions below and the Transmit Data Flow diagram in Section 22
for more details.
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 |
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