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參數資料
| 型號： | DS21FT44 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PBGA300 |
| 封裝： | 27 X 27 MM, 1.27 MM PITCH, MCMBGA-300 |
| 文件頁數： | 28/117頁 |
| 文件大?。?/td> | 691K |
| 代理商： | DS21FT44 |
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DS21FT44/DS21FF44
18 of 117
6. DS21Q44 INTRODUCTION
The DS21Q44 is a superset version of the popular DS21Q43 quad E1 framer offering the new features
listed below. All of the original features of the DS21Q43 have been retained and software created for the
original device is transferable to the DS21Q44.
NEW FEATURES
§ Additional hardware signaling capability including:
–
receive signaling reinsertion to a backplane multiframe sync
–
availability of signaling in a separate PCM data stream
–
signaling freezing
–
interrupt generated on change of signaling data
§ Per–channel code insertion in both transmit and receive paths
§ Full HDLC controller with 64-byte buffers in both transmit and receive paths. Configurable for Sa
bits or DS0 access
§ RCL, RLOS, RRA, and RUA1 alarms now interrupt on change of state
§ 8.192MHz clock synthesizer
§ Ability to monitor one DS0 channel in both the transmit and receive paths
§ Option to extend carrier loss criteria to a 1 ms period as per ETS 300 233
§ Automatic RAI generation to ETS 300 011 specifications
§ IEEE 1149.1 support
FUNCTIONAL DESCRIPTION
The receive side in each framer locates FAS frame and CRC and CAS multiframe boundaries as well as
detects incoming alarms including, carrier loss, loss of synchronization, AIS and Remote Alarm. If
needed, the receive side elastic store can be enabled in order to absorb the phase and frequency
differences between the recovered E1 data stream and an asynchronous backplane clock, which is
provided at the RSYSCLK input. The clock applied at the RSYSCLK input can be either a 2.048 MHz
clock or a 1.544 MHz clock. The RSYSCLK can be a burst clock with speeds up to 8.192 MHz.
The transmit side in each framer is totally independent from the receive side in both the clock
requirements and characteristics. Data off of a backplane can be passed through a transmit side elastic
store if necessary. The transmit formatter will provide the necessary frame/multiframe data overhead for
E1 transmission.
READER’S NOTE:
This data sheet assumes a particular nomenclature of the E1 operating environment. In each 125s frame,
there are 32 8-bit timeslots numbered 0 to 31. Timeslot 0 is transmitted first and received first. These 32
timeslots are also referred to as channels with a numbering scheme of 1 to 32. Timeslot 0 is identical to
channel 1, timeslot 1 is identical to Channel 2, and so on. Each timeslot (or channel) is made up of 8 bits,
which are numbered 1 to 8. Bit number 1 is the MSB and is transmitted first. Bit number 8 is the LSB and
is transmitted last. Throughout this data sheet, the following abbreviations are used:
FAS
Frame Alignment Signal
CRC4
Cyclical Redundancy Check
CAS
Channel Associated Signaling
CCS
Common Channel Signaling
MF
Multiframe
Sa
Additional bits
Si
International bits
E-bit
CRC4 Error Bits
相關PDF資料 |
PDF描述 |
|---|---|
| DS21Q352 | DATACOM, PCM TRANSCEIVER, PBGA256 |
| DS21Q354 | DATACOM, PCM TRANSCEIVER, PBGA256 |
| DS21Q41BT | DATACOM, FRAMER, PQFP128 |
| DS21Q42TN | DATACOM, FRAMER, PQFP128 |
| DS21Q42T | DATACOM, FRAMER, PQFP128 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS21FT44+ | 功能描述:網絡控制器與處理器 IC 4X3 E1 Framer E1 Framer E1 Framer RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21FT44N | 功能描述:網絡控制器與處理器 IC 4x4 16/4x3 12 Chnl E1/E1 Framer RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21FT44N+ | 功能描述:網絡控制器與處理器 IC 4x4 16/4x3 12 Chnl E1/E1 Framer RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q348 | 功能描述:網絡控制器與處理器 IC RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q348B | 功能描述:網絡控制器與處理器 IC RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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