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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客運站 |
| 文件頁數(shù)： | 12/34頁 |
| 文件大小： | 416K |
| 代理商： | MA28139 |
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MA28139
12/34
OBDH / IUB INTERFACE
The Central Terminal Unit controls timing, commands and
telemetry to all subsystems on the OBDH bus. ESA TTC-B-01
specifies the OBDH to be 2 redundant sets (Nominal and
Redundant) of 2 twisted pairs (Interrogation and Response
bus) plus an optional redundant 3rd twisted pair (Block
Transfer bus), Litton modulated (self clocking with parity on
each bit), balanced transformer coupled for less than 1 error in
100 million bits on a 25 metre bus. The data rate is nominally
500K Bits/sec although the chip itself supports up to 5MBits/
sec. The OBT is transformer coupled with adjustable reference
and threshold levels as shown below. Litton more positive than
V
th+
makes discriminator signal NIDS1n low. Litton more
negative than V
th-
makes NIDS2n low. OBT RR1n, RR2,
RR3n, RR4 control 4 switches which drive the bus with bipolar
Litton code when enabled. For clarity redundancy is not shown
below:
TTC-B-01 also specifies the IUB. The OBT supplies
specified clocks, memory load address for ML data (or channel
address for mode command) and responds on the R bus with a
13 zeroes response as acknowledgement. If the command
requires data aquisition, the OBT responds with a 13 or 21 bit
response containing 8 or 16 bits (respectively) of user data,
controlling external ADC as required.
Note: Connections
to redundant OBDH
busses omitted for
clarity.
Figure 11: OBDH to IUB interface
+5V
I-BUS
OBT
+
-
+
-
CLOCKS
ML ADDRESS
ML DATA
CHANNEL ADDRESS
MODE COMMAND
ANALOG TO DIGITAL
CONVERTER CONTROLS
IUB
ENABLE
GND
+5V
GND
REF
R-BUS
DATA
V
th+
V
th-
NIDS1n
NIDS2n
RR1n
RR3n
RR2
RR4
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