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型号： IDT82P2828BHG
厂商： IDT, Integrated Device Technology Inc
文件页数： 96/154页
文件大小： 0K
描述： IC LIU T1/J1/E1 28+1CH 640-PBGA
标准包装： 5
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： 640-BGA 裸露焊盘
供应商设备封装： 640-PBGA-EP（31x31）
包装： 托盘
其它名称： 82P2828BHG
IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Functional Description
46
February 6, 2009
3.5.3.3 Transmit LOS (TLOS)
The amplitude and density of the data output on the transmit line side
are monitored. When the amplitude of the data is less than a certain
voltage for a certain period, TLOS is declared. The voltage is defined by
the TALOS[1:0] bits (b3~2, LOS,...). The period is defined by the
TDLOS[1:0] bits (b1~0, LOS,...). When a valid pulse is detected, i.e., the
amplitude is above the setting in the TALOS[1:0] bits (b3~2, LOS,...),
TLOS is cleared.
When TLOS is detected, the TLOS_S bit (b2, STAT0,...) will be set. A
transition from ‘0’ to ‘1’ on the TLOS_S bit (b2, STAT0,...) or any transi-
tion (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the TLOS_S bit (b2, STAT0,...) will
set the TLOS_IS bit (b2, INTS0,...) to ‘1’, as selected by the TLOS_IES
bit (b2, INTES,...). When the TLOS_IS bit (b2, INTS0,...) is ‘1’, an inter-
rupt will be reported by INT if not masked by the TLOS_IM bit (b2,
INTM0,...).
TLOS may be counted by an internal Error Counter or may be indi-
cated by the TMFn pin. Refer to Section 3.5.6 Error Counter and
Section 3.5.7.2 TMFn Indication respectively.
TLOS can be used to monitor the LOS in the transmit line side
between two channels. The connection between the two channels is
shown in Figure-25. The two channels can be of the same device or
different devices on the premises that the transmit line interfaces are in
the same mode and at least the output of one channel is in High-Z state.
Table-19 lists each results in this case. In the left two columns, the OE
bit (b6, TCF0,...) of the two channels controls the output status in the
transmit line side to ensure that at least one channel is in High-Z state.
The middle two columns list the internal operation status. In the right two
columns, the TLOS_S bit (b2, STAT0,...) of the two channels indicates
the TLOS status in the transmit line side.
Figure-25 TLOS Detection Between Two Channels
Line
Driver
TLOS
Line
Driver
TLOS
TTIPn
TRINGn
TTIPn
TRINGn
Channel #1
Channel #2
TLOS
Detector
TLOS
Detector
Table-19 TLOS Detection Between Two Channels
Output Status ~ Controlled By the OE Bit
Internal Operation Status
TLOS Status ~ Indicated By the TLOS_S Bit
Channel #1
Channel #2
Channel #1
Channel #2
Channel #1
Channel #2
Normal ~ 1
High-Z ~ 0
Normal
(don’t-care)
No TLOS ~ 0
Normal ~ 1
High-Z ~ 0
Failure
Normal
TLOS Detected ~ 1 *
TLOS Detected ~ 1
High-Z ~ 0
Normal ~ 1
(don’t-care)
Normal
No TLOS ~ 0
High-Z ~ 0
Normal ~ 1
Normal
Failure
TLOS Detected ~ 1
TLOS Detected ~ 1 *
High-Z ~ 0
(don’t-care)
TLOS Detected ~ 1
Note:
* The TLOS_S bit (b2, STAT0,...) may not be set if there is any catastrophic failure in the channel.
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