GS2971A Datasheet, PDF (14/152 Pages) Gennum Corporation – Integrated audio clock generator

Table 1-1:Pin Descriptions (Continued)
Pin
Number
G3
G7
G8
H1
H2
H3
H4
Name
Timing
Type
Description
RC_BYP
SMPTE_BYPASS
DVB_ASI
BUFF_VDD
BUFF_GND
AUDIO_EN/DIS
WCLK
Input
CONTROL SIGNAL INPUT
Please refer to the Input Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
When this pin is LOW, the serial digital output is the buffered
version of the input serial data. When this pin is HIGH, the serial
digital output is the reclocked version of the input serial data.
Input/Output
CONTROL SIGNAL INPUT/OUTPUT
Please refer to the Input/Output Logic parameters in the DC
Electrical Characteristics table for logic level threshold and
compatibility.
Indicates the presence of valid SMPTE data.
When the AUTO/MAN bit in the host interface register is HIGH
(Default), this pin is an OUTPUT. SMPTE_BYPASS is HIGH when the
device locks to a SMPTE compliant input. SMPTE_BYPASS is LOW
under all other conditions.
When the AUTO/MAN bit in the host interface register is LOW, this
pin is an INPUT:
No SMPTE scrambling takes place, and none of the I/O processing
features of the device are available when SMPTE_BYPASS is set
LOW.
When SMPTE_BYPASS is set HIGH, the device carries out SMPTE
scrambling and I/O processing.
When SMPTE_BYPASS and DVB_ASI are both set LOW, the device
operates in Data-Through mode.
Input/Output
CONTROL SIGNAL INPUT
Please refer to the Input/Output Logic parameters in the DC
Electrical Characteristics table for logic level threshold and
compatibility.
Used to enable/disable DVB-ASI data extraction in manual mode.
When the AUTO/MAN bit in the host interface is LOW, this pin is an
input and when the DVB_ASI pin is set HIGH the device will carry out
DVB_ASI data extraction and processing. The SMPTE_BYPASS pin
must be set LOW. When SMPTE_BYPASS and DVB_ASI are both set
LOW, the device operates in Data-Through mode.
When the AUTO/MAN bit in the host interface is HIGH (default),
DVB-ASI is configured as a status output (set LOW), and DVB-ASI
input streams are not supported or recognized.
Input Power POWER pin for the serial digital output 50Ω buffer. Connect to 3.3V
DC analog.
Input Power GND pin for the cable driver buffer. Connect to analog GND.
Input
CONTROL SIGNAL INPUT
Please refer to the Input Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
Enables or disables audio extraction.
Output
48kHz word clock for Audio.
Please refer to the Output Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
GS2971A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54311 - 2
September 2012
14 of 152