GS2972 Datasheet, PDF (18/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

Table 1-1: Pin Descriptions (Continued)
Pin
Number
Name
Timing
Type
J8
TCK
Input
J9
SDOUT_TDO
Output
J10
SCLK_TCK
Input
K4
AIN_7/8
K5
ACLK2
K6
AIN_3/4
K7
ACLK1
Input
Input
Input
Input
Description
COMMUNICATION SIGNAL INPUT.
Please refer to the Input Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
JTAG Serial Data Clock Signal.
This pin is the JTAG clock when the JTAG/HOST pin is LOW.
COMMUNICATION SIGNAL OUTPUT.
Please refer to the Output Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
Shared JTAG/HOST pin. Provided for compatibility with the GS1582.
Serial Data Output/Test Data Output.
Host Mode (JTAG/HOST = LOW)
This pin operates as the host interface serial output, used to read
status and configuration information from the internal registers of
the device.
JTAG Test Mode (JTAG/HOST = HIGH)
This pin is used to shift test results and operates as the JTAG test
data output, TDO (for new designs, use the dedicated JTAG port).
Note: If the host interface is not being used leave this pin
unconnected.
IO_VDD = +3.3V
Drive Strength = 12mA
IO_VDD = +1.8V
Drive Strength = 4mA
COMMUNICATION SIGNAL INPUT.
Please refer to the Input Logic parameters in the DC Electrical
Characteristics table for logic level threshold and compatibility.
Shared JTAG/HOST pin. Provided for pin compatibility with GS1582.
Serial data clock signal.
Host Mode (JTAG/HOST = LOW)
SCLK_TCK operates as the host interface burst clock, SCLK.
Command and data read/write words are clocked into the device
synchronously with this clock.
JTAG Test Mode (JTAG/HOST = HIGH)
This pin is the TEST MODE START pin, used to control the operation
of the JTAG test clock, TCK (for new designs, use the dedicated JTAG
port).
Note: If the host interface is not being used, tie this pin HIGH.
Serial Audio Input; Channels 7 and 8.
64 x WCLK associated with AIN_5/6 and AIN_7/8 (channels 5, 6, 7 and
8).
Serial Audio Input; Channels 3 and 4.
64 x WCLK associated with AIN_1/2 and AIN_3/4 (channels 1, 2, 3and
4).
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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