GS2962 Datasheet, PDF (28/82 Pages) Gennum Corporation – Integrated Narrow-Bandwidth PLL

Table 4-2: GS2962 Input Video Data Format Selections (Continued)
Input Data Format
20-bit demultiplexed
HD format
20-bit data Input
HD format
20-bit demultiplexed SD
format
20-bit data input
SD format
10-bit multiplexed
3G DDR format
20BIT
/10BIT
HIGH
HIGH
HIGH
HIGH
LOW
Pin/Register Bit Settings
RATE
_SEL0
LOW
RATE
_SEL1
LOW
SMPTE
_BYPASS
HIGH
DVB_ASI
LOW
LOW
LOW
LOW
LOW
HIGH
X
HIGH
X
HIGH
LOW
LOW
LOW
LOW
HIGH
HIGH
LOW
10-bit multiplexed
HD format
10-bit data input
HD format
10-bit multiplexed
SD format
10-bit multiplexed
SD format
10-bit ASI input
SD format
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
LOW
LOW
X
X
X
HIGH
LOW
HIGH
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
DIN[9:0]
Chroma
DATA
Chroma
DATA
High
Impedance
High
Impedance
High
Impedance
High
Impedance
High
Impedance
High
Impedance
DIN[19:10]
Luma
DATA
Luma
DATA
Data Stream
One/Data Stream
Two
Luma/Chroma
DATA
Luma/Chroma
DATA
DVB-ASI data
The GS2962 is a high performance 3Gb/s capable transmitter. In order to optimize the
output jitter performance across all operating conditions, input levels and overshoot at
the parallel video data inputs of the device need to be controlled. In order to do this,
source series termination resistors should be used to match the impedance of the PCB
data trace line. IBIS models can be used to simulate the board effects and then optimize
the output drive strength and the termination resistors to allow for the best transition
(one that produces minimal overshoot). If this is not viable, Gennum recommends
matching the source series resistance to the trace impedance, and then adjusting the
output drive strength to the minimum value that will give zero errors.
The above also applies to the PCLK input line. HVF should also be well terminated,
however due to the lower data rates and transition density, it is not as critical.
4.2.1 Parallel Input in SMPTE Mode
When the device is operating in SMPTE mode (SMPTE_BYPASS = HIGH), data must be
presented to the input bus in either multiplexed or demultiplexed form, depending on
the setting of the 20BIT/10BIT pin.
GS2962 3G/HD/SD-SDI Serializer with Complete
SMPTE Video Support
Data Sheet
48005 - 7
October 2010
28 of 82