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參數(shù)資料
| 型號： | IDT82P20516DBFG |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 27/115頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU T1/E1/J1 16CH SH 484BGA |
| 標準包裝： | 84 |
| 功能： | 線路接口單元（LIU） |
| 接口： | E1，J1，T1 |
| 電路數(shù)： | 16 |
| 電源電壓： | 1.8V, 3.3V |
| 功率（瓦特）： | 2.89W |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 484-LFBGA |
| 供應商設備封裝： | 484-CABGA（19x19） |
| 包裝： | 托盤 |
| 包括： | AIS 警報檢測器和發(fā)生器，回送功能，PRBS 發(fā)生器 / 檢測器，遠程檢測器和發(fā)生器 |
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IDT82P20516
16-CHANNEL SHORT HAUL E1 LINE INTERFACE UNIT
Functional Description
19
December 17, 2009
3
FUNCTIONAL DESCRIPTION
3.1
E1 MODE SELECTION
The IDT82P20516 can be configured to E1 mode globally or on a
per-channel basis. The configuration is determined by the TEHWE pin,
the TEHW pin and the E1 bit (b0, CHCF,...). Refer to Table-1 for details
of the operation mode selection.
3.2
RECEIVE PATH
3.2.1
RX TERMINATION
The receive line interface supports Receive Differential mode. In
Receive Differential mode, both RTIPn and RRINGn are used to receive
signal from the line side.
In Receive Differential mode, the line interface can be connected
with E1 120
twisted pair cable or E1 75 coaxial cable.
The receive impedance matching is realized by using internal imped-
ance matching or external impedance matching for each channel in
different applications.
3.2.1.1 Receive Differential Mode
In Receive Differential mode, three kinds of impedance matching are
supported: Fully Internal Impedance Matching, Partially Internal Imped-
ance Matching and External Impedance Matching. Figure-3 shows an
overview of how these Impedance Matching modes are switched.
Fully Internal Impedance Matching circuit uses an internal program-
mable resistor (IM) only and does not use an external resistor. This
configuration saves external components and supports 1:1 Hitless
Protection Switching (HPS) applications without relays. Refer to
Partially Internal Impedance Matching circuit consists of an internal
programmable resistor (IM) and a value-fixed 120
external resistor
(Rr). Compared with Fully Internal Impedance Matching, this configura-
tion provides considerable savings in power dissipation of the device.
For example, In E1 120
PRBS mode, the power savings would be
0.44 W. For power savings in other modes, please refer to Chapter 8
External Impedance Matching circuit uses an external resistor (Rr)
only.
Figure-3 Switch between Impedance Matching Modes
To support some particular applications, such as hot-swap or Hitless
Protection Switch (HPS) hot-switchover, RTIPn/RRINGn must be forced
to enter high impedance state (i.e., External Impedance Matching). For
hot-swap, RTIPn/RRINGn must be always held in high impedance state
during /after power up; for HPS hot-switchover, RTIPn/RRINGn must
enter high impedance state immediately after switchover. Though each
channel can be individually configured to External Impedance Matching
through register access, it is too slow for hitless switch. Therefore, a
hardware pin - RIM - is provided to globally control the high impedance
for all 16 receivers.
When RIM is low, only External Impedance Matching is supported for
all 16 receivers and the per-channel impedance matching configuration
bits - the R_TERM[2:0] bits (b2~0, RCF0,...) and the R120IN bit (b4,
RCF0,...) - are ignored.
Table-1 Operation Mode Selection
Global Programming
Per-Channel Programming
TEHWE Pin
Open
Low
TEHW Pin
Open
Low
(The configuration of this pin is ignored)
E1 Bit
(The configuration of this bit is ignored).
0
1
Operation Mode
E1
IM
RTIP
RRING
RIN
R_TERM2
1 0
0 1
Receive
path
R_TERM[1:0]
RIM
R120IN
Rr = 120
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IDT82P20516DBFG8 | 制造商:Integrated Device Technology Inc 功能描述:IC LIU T1/E1/J1 16CH SH 484BGA |
| IDT82P20516DBFGBLANK | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:16-Channel Short Haul E1 Line Interface Unit |
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