参数资料
型号: IDT82V2044EPFG8
厂商: IDT, Integrated Device Technology Inc
文件页数: 24/73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: 800-1863-6
30
INDUSTRIAL
TEMPERATURE RANGES
QUAD CHANNEL T1/E1/J1 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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