GS9060 Data Sheet
3. Detailed Description
3.1 Functional Overview
The GS9060 is a dual-standard reclocking deserializer with an integrated serial
digital loop-through output. When used in conjunction with any Gennum cable
equalizer and the external GO1555/GO1525* Voltage Controlled Oscillator, a
receive solution at 270Mb/s is realized.
The application layer must set external device pins for the correct reception of
either SMPTE or DVB-ASI data. The GS9060 also supports the reclocking and
deserializing of data not conforming to SMPTE or DVB-ASI streams.
The provided serial loop-through outputs may be selected as either buffered or
reclocked versions of the input signal and feature a high impedance mode, output
mute on loss of signal and adjustable signal swing.
In the digital signal processing core, several data processing functions are
implemented including error detection and correction and automatic video
standards detection. These features are all enabled by default, but may be
individually disabled via internal registers accessible through the GSPI host
interface.
Finally, the GS9060 contains a JTAG interface for boundary scan test
implementations.
*For new designs use GO1555
3.2 Serial Digital Input
The GS9060 contains two current mode differential serial digital input buffers,
allowing the device to be connected to two SMPTE 259M-C compliant input
signals.
Both input buffers have internal 50Ω termination resistors which are connected to
ground via the TERM1 and TERM2 pins. The input common mode level is set by
internal biasing resistors such that the serial digital input signals must be AC
coupled into the device. Gennum recommends using a capacitor value of 4.7uF to
accommodate pathological signals.
The input buffers use a separate power supply of +1.8V DC supplied via the
BUFF_VDD and PDBUFF_GND pins.
3.2.1 Input Signal Selection
A 2x1 input multiplexer is provided to allow the application layer to select between
the two serial digital input streams using a single external pin. When IP_SEL is set
HIGH, serial digital input 1 (DDI1 / DDI1) is selected as the input to the GS9060's
reclocker stage. When IP_SEL is set LOW, serial digital input 2 (DDI2 / DDI2) is
selected.
22208 - 8 January 2007
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GENNUM [ GENNUM CORPORATION ]
