GS1572 A Guide to Designing with the GS1572
(EB1572)
Reference Design
46282 - 1
November 2009
9 of 18
Proprietary & Confidential
Figure 3-3: Output Block
3.4 Modes of Operation
The GS1572 has three basic modes of operation which determine what processing the
input data will undergo prior to serialization.
SMPTE MODE — The input data will be scrambled according to SMPTE 259M and 292M,
and encoded prior to serialization.
DVB-ASI MODE — All SMPTE processing features are disabled, and the 8-bit transport
stream data will be 8b/10b encoded prior to serialization.
DATA-THROUGH MODE — The device operates as a simple parallel-to-serial converter.
Input data is serialized and presented to the output buffer without any prior scrambling
or encoding.
gives a description of the GS1572 jumper settings in each mode.
NOTE: The jumpers correspond directly to pins on the GS1572. Please see the GS1572
Data Sheet for a more detailed explanation of the operation of these pins in each mode.
Depending on the mode of the GS1572, the SMPTE or DVB_ASI jumpers on the GS1572
must be set appropriately (see
). If the device is in SMPTE mode, the two
jumpers should be placed horizontally to connect D18 and D19 directly to the DIN18
and DIN19 pins on the GS1572. If the device is in DVB_ASI mode, the two jumpers
should be placed vertically to tie KIN on the DIN18 pin of the device and tie INSSYNCIN
(DIN19) to GND. This is done to allow the GS1572 to directly interface with the EB1559
REV B where DOUT19 = SYNCOUT and DOUT18 = WORDERR.
For more information on the KIN and INSSYNCIN signals, please see the GS1572 Data
Sheet.
SERIAL DIGITAL
DIFFERENTIAL
OUTPUTS
