cs4271 Cirrus Logic, Inc., cs4271 Datasheet - Page 41

• Manufacturer Part Number: cs4271
• Description: 24-bit, 192 Khz Stereo Audio Codec
• Manufacturer: Cirrus Logic, Inc.

8.3.3
DS592F1
Soft Ramp and Zero Cross Enable
Function:
ATAPI Channel Mixing and Muting (Bits 3:0)
itored and implemented for each channel. See Table 14 on page 41.
Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or
muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level
change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms
at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is
independently monitored and implemented for each channel. See Table 14 on page 41.
The CS4271 implements the channel mixing functions of the ATAPI CD-ROM specification. See
Table 15 on page 42
Soft
0
0
1
1
Table 14. Soft Cross or Zero Cross Mode Selection
Right Channel
Left Channel
Audio Data
Audio Data
ZeroCross
Figure 20. ATAPI Block Diagram
0
1
0
1
Changes to affect immediately
Zero Cross enabled
Soft Ramp enabled (default)
Soft Ramp and Zero Cross enabled
Σ
A Channel
B Channel
Mode
Volume
Volume
Control
Control
AoutB
AoutA
CS4271
41