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| 型号： | IDT82V2084PFG8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 25/75页 |
| 文件大小： | 0K |
| 描述： | IC LINE INTERFC UNIT 4CH 128TQFP |
| 标准包装： | 1 |
| 类型： | 线路接口装置（LIU） |
| 规程： | E1 |
| 电源电压： | 3.13 V ~ 3.47 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-LQFP |
| 供应商设备封装： | 128-TQFP（14x20） |
| 包装： | 标准包装 |
| 其它名称： | 800-1864-6 |
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31
INDUSTRIAL
TEMPERATURE RANGES
QUAD CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
3.10 MCLK AND TCLK
3.10.1 MASTER CLOCK (MCLK)
MCLK is an independent, free-running reference clock. MCLK is 1.544
MHz or 37.056 MHz for T1/J1 applications and 2.048 MHz or 49.152 MHz
in E1 mode. This reference clock is used to generate several internal ref-
erence signals:
Timing reference for the integrated clock recovery unit.
Timing reference for the integrated digital jitter attenuator.
Timing reference for microcontroller interface.
Generation of RCLK signal during a loss of signal condition if AIS is
enabled.
Reference clock during a blue alarm Transmit All Ones (TAOS), all
zeros, PRBS/QRSS and inband loopback patterns if it is selected
as the reference clock. For ATAO and AIS, MCLK is always used as
the reference clock.
Figure-19 shows the chip operation status in different conditions of
MCLK and TCLKn. The missing of MCLK will set all the four TTIP/TRING
to high impedance state.
3.10.2 TRANSMIT CLOCK (TCLK)
The TCLKn is used to sample the transmit data on TDn/TDPn, TDNn.
The active edge of TCLKn can be selected by the TCLK_SEL bit (TCF0,
02H...). During Transmit All Ones, PRBS/QRSS patterns or Inband Loop-
back Code,either TCLKnor MCLK can beused as the referenceclock. This
is selected by the PATT_CLK bit (MAINT0, 0AH...).
But for Automatic Transmit All Ones and AIS, only MCLK is used as the
reference clock and the PATT_CLK bit is ignored. In Automatic Transmit
All Ones condition, the ATAO bit (MAINT0, 0AH) is set to ‘1’. In AIS condi-
tion, the AISE bit (MAINT0, 0AH) is set to ‘1’.
If TCLKn has been missing for more than 70 MCLK cycles, TCLK_LOS
bit (STAT0, 14H...) will be set, and the corresponding TTIPn/TRINGn will
become high impedance if this channel is not used for remote loopback or
isnotusingMCLK totransmitinternal patterns (TAOS,AllZeros,PRBSand
in-band loopback code). When TCLKn is detected again, TCLK_LOS bit
(STAT0,14H...)willbecleared.ThereferencefrequencytodetectaTCLKn
loss is derived from MCLK.
Figure-19 TCLK Operation Flowchart
normal operation mode
transmitter n enters high
impedance status and
generates transmit clock loss
interrupt if not masked
TCLKn status?
clocked
L/H
MCLK=H/L?
all transmitters high
impedance status
yes
clocked
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT82V2088 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:OCTAL CHANNEL T1/E1/J1 LONG HAUL/ SHORT HAUL LINE INTERFACE UNIT |
| IDT82V2088_08 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:OCTAL CHANNEL T1/E1/J1 LONG HAUL/ SHORT HAUL LINE INTERFACE UNIT |
| IDT82V2088BB | 功能描述:IC LIU T1/J1/E1 8CH 208-BGA RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| IDT82V2088BBG | 功能描述:IC LINE INTERFACE UNIT 208-PBGA RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| IDT82V2088DR | 功能描述:IC LIU T1/J1/E1 8CH 208-TQFP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
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