GS2972 Datasheet, PDF (46/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

Table 4-5: Serial Audio Input Pin Description (Continued)
Pin Name
Description
GRP2_EN/DIS
AIN_5/6
AIN_7/8
ACLK2
WCLK2
Audio Group 2
Enable Input for Audio Group 2
Serial Audio Input; Channels 5 and 6
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)
48kHz Word Clock associated with AIN_5/6 and AIN_7/8
(channels 5, 6, 7 and 8)
The serial audio input signals and WCLK input signals will enter the device on the rising
edge of ACLK as shown in Figure 4-20.
ACLK
AIN_1/2, AIN_3/4,
AIN_5/6, AIN_7/8
DATA
DATA
WCLK
t
SU
t_IH
Figure 4-20: ACLK to Data and Control Signal Input Timing
Table 4-6: GS2972 Serial Audio Data Inputs - AC Electrical Characteristics
Parameter
Symbol
Conditions
Input data set-up
time
t_SU
50% levels;
Input data hold
time
+3.3V or +1.8V operation
t_IH
Min
1.3
0.8
Typ Max Units
−
−
ns
−
−
ns
When GRP1_EN/DIS and GRP2_EN/DIS are set HIGH, the respective audio group is
enabled, and the audio input signals associated with that group are processed and
embedded into the video data stream.
When GRP1_EN/DIS and GRP2_EN/DIS are set LOW, the respective audio group is
disabled and the audio input signals associated with that group are ignored. In addition,
all functional logic associated with audio insertion for the disabled audio group is placed
in a static operating mode, such that system power is reduced while the device
configuration is retained.
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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