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SDM-2020 Satellite Demodulator
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
A.2.4.2
Serial, J4, DB25 Female (EIA-530 Serial Data Interface)
This interface has no provision for SYNC or DVALID signals. If framing is desired, a
sync byte (47 hex) is embedded into the data stream every 188 or 204 bytes, as selected
in the Demodulator configuration. The Demodulator detects the sync byte and formats the
serial interface data into a standard, error-protected 204 byte packet.
Rev.3
Table A-4. DVB Interface Connector Pinout, J3
Signal Function/Name
Clock A
System GND/REFCLKB
Data 7 A(MSB/Serial)
Data 6 A
Data 5 A
Data 4 A
Data 3 A
Data 2 A
Data 1 A
Data 0 A
DVALID A
SYNC A
Cable Shield
Clock B
System GND/REFCLKA
Data 7 B (MSB/Serial)
Data 6 B
Data 5 B
Data 4 B
Data 3 B
Data 2 B
Data 1 B
Data 0 B
DVALID B
SYNC B
Type
Comment
I/O
Mod/Demod
O/GND
Mod/Demod
Jumper selectable
SCT for Modulator
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
O/GND
Mod/Demod
Jumper selectable
SCT for Modulator
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
I/O
Mod/Demod
Data Interfaces
A–9
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