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參數(shù)資料
| 型號： | XRT91L31 |
| 廠商： | Exar Corporation |
| 英文描述： | STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER |
| 中文描述： | STS-12/STM-4或STS-3/STM-1的SONET / SDH收發(fā)器 |
| 文件頁數(shù)： | 14/41頁 |
| 文件大?。?/td> | 356K |
| 代理商： | XRT91L31 |
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XRT91L31
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
xr
REV. 1.0.2
12
1.0
FUNCTIONAL DESCRIPTION
The XRT91L31 transceiver is designed to operate with a SONET Framer/ASIC device and provide a high-
speed serial interface to optical networks. The transceiver converts 8-bit parallel data running at 77.76 Mbps
(STS-12/STM-4) or 19.44 Mbps (STS-3/STM-1) to a serial Differential LVPECL bit stream at 622.08 Mbps or
155.52 Mbps and vice-versa. It implements a clock multiplier unit (CMU), SONET/SDH serialization/de-
serialization (SerDes), receive clock and data recovery (CDR) unit and a SONET/SDH frame and byte
boundary detection circuit. The transceiver is divided into Transmit and Receive sections and is used to
provide the front end component of SONET equipment, which includes primarily serial transmit and receive
functions.
1.1
STS-12/STM-4 and STS-3/STM-1 Mode of Operation
Functionality of the transceiver can be configured by using the appropriate signal level on the STS-12/STS-3
pin. STS-3/STM-1 mode is selected by pulling STS-12/STS-3 "Low" as described in the Hardware Pin
Descriptions. However, if STS-12/STM-4 mode is desired, it is selected by pulling STS-12/STS-3 "High."
Therefore, the following sections describe the functionality rather than how each function is controlled. Hence,
the Hardware Pin and Register Bit Descriptions focus on device configuration.
1.2
Clock Input Reference for Clock Multiplier (Synthesizer) Unit
The XRT91L31 can accept both a 19.44 MHz or a 77.76 MHz Differential LVPECL clock input at REFCLKP/N
or a Single-Ended LVTTL clock at TTLREFCLK as its internal timing reference for generating higher speed
clocks. The REFCLKP/N or TTLREFCLK input should be generated from an LVPECL/LVTTL crystal oscillator
which has a frequency accuracy better than 20ppm in order for the transmitted data rate frequency to have the
necessary accuracy required for SONET systems. The reference clock can be provided with one of two
frequencies chosen by CMUFREQSEL. The reference frequency options for the XRT91L31 are listed in
Table 1.
1.3
Due to different operating modes and data logic paths through the device, there is an associated latency from
data ingress to data egress. Table 2 specifies the data latency for a typical path.
T
ABLE
2: D
ATA
INGRESS
TO
DATA
EGRESS
LATENCY
Data Latency
T
ABLE
1: CMU R
EFERENCE
F
REQUENCY
O
PTIONS
(D
IFFERENTIAL
OR
S
INGLE
-E
NDED
)
CMUFREQSEL
STS12/STS3
REFCLKP/N
OR
TTLREFCLK
REFERENCE
FREQUENCY
D
ATA
R
ATE
0
0
77.76 MHz
STS-3/STM-1
155.52 Mbps
0
1
77.76 MHz
STS-12/STM-4
622.08 Mbps
1
0
19.44 MHz
STS-3/STM-1
155.52 Mbps
1
1
19.44 MHz
STS-12/STM-4
622.08 Mbps
M
ODE
O
F
O
PERATION
D
ATA
P
ATH
C
LOCK
R
EFERENCE
R
ANGE
O
F
C
LOCK
C
YCLES
Thru-mode
MSB at RXIP/N to data on RXDO[7:0]
Recoved RXIP/N Clock
25 to 35
Serial Remote Loopback MSB at RXIP/N to MSB at TXOP/N
Recoved RXIP/N Clock
2 to 4
相關PDF資料 |
PDF描述 |
|---|---|
| XRT91L31IQ | STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER |
| XRT91L32 | STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER |
| XRT91L32IQ-F | STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER |
| XRT91L80 | 2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER |
| XRT91L80_0507 | 2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XRT91L31_08 | 制造商:EXAR 制造商全稱:EXAR 功能描述:STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER |
| XRT91L31ES | 功能描述:總線收發(fā)器 RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| XRT91L31IQ | 功能描述:網(wǎng)絡控制器與處理器 IC SONET/SDH, FULL DPLX 3.3V I/O, LOS, CMU RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)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 |
| XRT91L31IQ-F | 功能描述:網(wǎng)絡控制器與處理器 IC 8-Bit TTL 3.3V temp -45 to 85C;UART RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)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 |
| XRT91L31IQ-F | 制造商:Exar Corporation 功能描述:SONET Transceiver IC |
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