Datasheet

Miscellaneous Functions
3-10
3.8 Miscellaneous Functions
This section provides information regarding several SRC419x and DIT4192
functions not described previously in this chapter.
Low group delay operation is controlled using the LGRP element of switch
SW7, or by the LGRP bit in Control Register 2 when using the SRC4193. The
low group delay option reduces the overall latency of the interpolation filter by
32/f
sIN
, where f
sIN
is the input sampling rate in hertz (Hz). Table 3–9 summa-
rizes Low Group Delay operation.
Table 3–9.Low Group Delay Configuration
LGRP Low Group Delay Mode
LO Disabled
HI Enabled
Bypass mode operation is controlled using the BYPAS element of switch SW7,
or by the BYPAS bit in Control Register 1 when using the SRC4193. When By-
pass mode is enabled, the audio data is passed directly from the input port to
the output port without sample rate conversion. This process is useful for pass-
ing through encoded audio or non–audio data. In Bypass mode, the mute, dith-
ering, and digital attenuation (SRC4193 only) functions are not available.
Table 3–10 summarizes Bypass mode operation.
Table 3–10.Bypass Mode Configuration
BYPAS Bypass Mode
LO Disabled
HI Enabled