GS1560A Gennum Corporation, GS1560A Datasheet - Page 28

• Manufacturer Part Number: GS1560A
• Description: Reclocking Deserializer For HD-SDI, Sd-sdi & Dvb-asi With Loop Thru Cable Driver. 3.3/1.8V Supply.
• Manufacturer: Gennum Corporation

3.6.2 Master Mode
Recall that the GS1560A is said to be in master mode when
the MASTER/SLAVE input signal is set HIGH. In this case,
the following four device pins become output status signals:
•
•
•
•
The combined setting of these four pins will indicate
whether the device has locked to valid SMPTE or DVB-ASI
data at SD or HD rates. Table 2 shows the possible
combinations.
GENNUM CORPORATION
SMPTE_BYPASS
DVB_ASI
SD/HD
RC_BYP
Table 2: Master Mode Output Status Signals
Table 3: Slave Mode Input Control Signals
HD SMPTE
SD SMPTE
DVB-ASI
NOT SMPTE OR DVB-ASI*
*NOTE: When the device locks to the data stream in PLL lock mode, the parallel outputs will be latched LOW, and
the serial loop-through output will be a buffered version of the input.
HD SMPTE
SD SMPTE
DVB-ASI
NOT SMPTE OR DVB-ASI*
*NOTE: See section 3.9 for a complete description of Data-Through mode.
FORMAT
FORMAT
SMPTE_BYPASS
SMPTE_BYPASS
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
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DVB_ASI
HIGH
LOW
LOW
LOW
3.6.3 Slave Mode
The GS1560A is said to be in slave mode when the
MASTER/SLAVE input signal is set LOW. In this case, the
four device pins listed in section 3.6.2 become input control
signals.
It is required that the application layer set the first three
inputs to reflect the appropriate input data format
(SMPTE_BYPASS, DVB_ASI, and SD/HD). If just one of
these three is configured incorrectly, the device will not lock
to the input data stream, and the DATA_ERROR pin will be
set LOW.
The fourth input signal, RC_BYP, allows the application
layer to determine whether the serial digital loop-through
output will be a reclocked or buffered version of the input,
(see section 3.4.2). Table 3 shows the required settings for
various input formats.
PIN SETTINGS
PIN SETTINGS
DVB_ASI
HIGH
LOW
LOW
LOW
HIGH OR LOW
SD/HD
HIGH
HIGH
LOW
HIGH OR LOW
SD/HD
HIGH
HIGH
LOW
RC_BYP
HIGH
HIGH
HIGH
LOW
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