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參數(shù)資料
| 型號： | MA28139 |
| 廠商： | Dynex Semiconductor Ltd. |
| 英文描述： | OBDH Bus Terminal |
| 中文描述： | OBDH客運(yùn)站 |
| 文件頁數(shù)： | 1/34頁 |
| 文件大?。?/td> | 416K |
| 代理商： | MA28139 |
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The OBT ASIC will interface any user to the ESA On Board
Data Handling bus. Developed under ESA Contract, it
conforms to ESA OBDH, Digital Bus Interface and Internal
User Bus Standards.
The OBT has 2 separate functions. The first is a 5 channel
modem which, on the bus side, provides the digital waveforms
necessary to operate the Litton Bus drivers, and receives the
outputs of the Litton bus detectors. On the user side, it
provides an input / output at Digital Bus Interface level. The
second function, internally coupled to the first, provides a
multiplexing / demultiplexing function of the DBI signals down
to Internal User Bus levels and vectored 16 bit serial register
read and write commands (see section 7.2 of ESA standard
TTC-B-01). In effect, the second function of the OBT provides
the core of an RTU.
The Interrogation and Response bus data streams of the
two functions may be either coupled together (in RT mode) or
isolated (in CT mode). The device may hence be used as a
modem only, an RTU kernel only or as a combined modem
and RTU kernel. In RT mode, the Interrogation bus data
stream can be observed and the Response bus data from
associated devices, such as an MA28138 Remote Bus
Interface, can be combined with that from the RTU kernel
before being used by the modem circuits to modulate the
Response bus. Bi-directional access to the Block Transfer bus
is provided in either mode.
When used to interface a central terminal to the OBDH bus,
the OBT should be continuously clocked in order to output
timing to all users on the I-bus as dummy interrogations from
the CT. Commands and telemetry are normally sent on the I
and BT busses whilst responses and telemetry normally return
on the R and BT busses.
Figure 1: Block Diagram
CONTROL
LOGIC
RTU
KERNEL
CONTROL
PINS
CLK DETECTOR,
WATCHDOG
DIGITAL
BUS
INTERFACE
INTERNAL
USER
BUS
CONFIGURATION PINS
OBDH BUS
I R BT
I Rx
R Rx
I (CTU)
R (RTU)
BT Rx
BT Rx
Tx
FEATURES
I
Radiation Hard
I
Low Power Consumption
I
Single CMOS-SOS ASIC Implementation
I
Latch-up Free
I
High SEU Immunity
I
Fully Compliant with ESA OBDH, IUB, DBI and RBI
Specification
I
Contains OBDH Bus Modem and RTU Kernel
I
Supports Bi-directional Data Transfer on Response and
Block Transfer Bus
MA28139
OBDH Bus Terminal
Replaces
June 1999
version,
DS3592-5.0
DS3592-6.0 January 2000
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| MA28150FBN | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
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