參數(shù)資料
型號(hào)： XRT91L32
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(yè)數(shù)： 19/37頁(yè)
文件大?。?/td> 417K
代理商： XRT91L32
xr
REV. 1.0.2
XRT91L32
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
17
2.6
A Frame and Byte Boundary Detection circuit searches the incoming data channel for three consecutive A1
(0xF6 Hex) bytes followed by three consecutive A2 (0x28 Hex) bytes. The detector operates under the control
of the OOF (Out of Frame) signals provided from the SONET Framer. Detection is enabled when OOF is held
"High" and remains active until OOF goes "Low." When framing pattern detection is enabled, the framing
pattern is used to locate byte and frame boundaries in the incoming receive data stream. The receive serial-to-
parallel converter block uses the located byte boundary to assemble the incoming data stream into bytes for
output on the parallel data output bus RXDO[7:0]. The frame boundary is reported on the frame pulse
(FRAMEPULSE) output at the onset of detecting the third A2 byte pattern when any serial 48-bit pattern
matching the framing pattern is detected on the incoming data stream. While in the pattern search and
detection state and so long is OOF is active, the frame pulse (FRAMEPULSE) output is activated for one byte
clock cycle (RXPCLKO = 12.86 ns pulse duration for STS-12/STM-4 or 51.44 ns pulse duration for STS-3/
STM-1) anytime a 48-bit pattern matching the framing pattern is detected on the incoming data stream. Once
the SONET Framer Overhead Circuitry has verified that frame and byte synchronization are correct, the OOF
input pin should be de-asserted by the SONET Framer to disable the XRT91L32 frame search process from
trying to synchronize repeatedly and to de-activate FRAMEPULSE. When the XRT91L32’s framing pattern
detection is disabled upon the de-assertion of OOF input pin from the SONET Framer, the byte boundary will
lock to the detected location and will remain locked to that location found when detection was previously
enabled.
SONET Frame Boundary Detection and Byte Alignment Recovery
2.7
During STS-12/STM-4 operation, the SIPO is used to convert the 622.08 Mbps serial data input to 77.76 Mbps
parallel data output which can interface to a SONET Framer/ASIC. If the XRT91L32 is operating in STS-3/
STM-1, the SIPO will convert the 155.52 Mbps serial data input to 19.44 Mbps parallel data output. The SIPO
bit de-interleaves the serial data input into an 8-bit parallel output to RXDO[7:0]. A simplified block diagram is
shown in Figure 8. XRT91L32 clocks data out on RXDO[7:0] at the falling edge of RXPCLKO.
Receive Serial Input to Parallel Output (SIPO)
F
IGURE
8. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
SIPO
b
0
0
b
0
1
b
0
2
b
0
3
b
n
0
b
n
1
b
n
2
b
n
3
b
n+
0
b
n+
1
b
n+
2
b
n+
3
b
7
0
b
7
1
b
7
2
b
7
3
8-bit Parallel LVTTL Output Data
RXDO0
RXDO7
RXDO
n+
RXDOn
RXIP/N
RXPCLKO
b
3
0 b
2
0 b
1
0 b
0
0
b
7
0 b
6
0 b
5
0 b
4
0
b
3
3 b
2
3 b
1
3
b
4
3
b
5
3
b
6
3
b
7
3
S
77.76 MHz (STS-12/STM-4) or 19.44 MHz (STS-3/STM-1)
622.08 Mbps STS-12/STM-4 or
155.52 Mbps STS-3/STM-1 serial data rate
相關(guān)PDF資料
PDF描述
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
XRT91L80IB 2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
XRT91L81 2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT91L32ES 功能描述:LIN 收發(fā)器 SONET SDH 8 bit TRANCEIVER RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8
XRT91L32IQ 功能描述:LIN 收發(fā)器 SONET SDH 8 bit TRANCEIVER RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8
XRT91L32IQ-F 功能描述:總線收發(fā)器 8-Bit TTL 3.3V temp -45 to 85C;UART 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(shí)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
XRT91L32IQTR 功能描述:LIN 收發(fā)器 PHY Transceiver RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8
XRT91L32IQTR-F 功能描述:LIN 收發(fā)器 PHY Transceiver RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8
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