CDB42528 Cirrus Logic Inc, CDB42528 Datasheet - Page 23

• Manufacturer Part Number: CDB42528
• Description: BOARD EVAL FOR CS42528/CS49300
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42528

• Main Purpose: Audio, Audio Processing
• Embedded: Yes, DSP
• Utilized Ic / Part: CS49300, CS42528
• Primary Attributes: 8 Single-Ended Analog Inputs and Outputs, 4 S/PDIF Inputs and 2 S/PDIF Outputs
• Secondary Attributes: Parallel, RS422, RS232, UDSP Interfaces
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1503

DS586F1
4.3.3
4.3.4
CX_SDINx
Digital Volume and Mute Control
Each DAC’s output level is controlled via the Volume Control registers operating over the range of 0 to
-127 dB attenuation with 0.5 dB resolution. See
14h, 15h, 16h)” on page
0.125 dB at the rate controlled by the SZC[1:0] bits in the Digital Volume Control register. See
Transition Control (address 0Dh)” on page
Each output can be independently muted via mute control bits in the register
0Eh)” on page
value (-127 dB). When the XX_MUTE bit is disabled, the corresponding DAC returns to the attenuation
level set in the Volume Control register. The attenuation is ramped up and down at the rate specified by
the SZC[1:0] bits.
The Mute Control pin, MUTEC, is typically connected to an external mute control circuit. The Mute Control
pin outputs high impedance during Power-Up or in Power-Down Mode by setting the PDN bit in the reg-
ister
controlled by the user via the control port, or automatically asserted high when zero data is present on all
DAC inputs, or when serial port clock errors are present. To prevent large transients on the output, it is
desirable to mute the DAC outputs before the Mute Control pin is asserted. Please see the MUTEC pin
in the Pin Descriptions section for more information.
Each of the RXP1/GPO1-RXP7/GPO7 can be programmed to provide a hardware MUTE signal to indi-
vidual circuits. When not used as an S/PDIF input, each pin can be programmed as an output, with spe-
cific muting capabilities as defined by the function bits in the register
(addresses 29h to 2Fh)” on page
ATAPI Specification
The CS42528 implements the channel-mixing functions of the ATAPI CD-ROM specification. The
ATAPI functions are applied per A-B pair. Refer to
mation.
“Power Control (address 02h)” on page 47
Right Channel
Left Channel
Audio Data
Audio Data
58. When enabled, each XX_MUTE bit attenuates the corresponding DAC to its maximum
Figure 8. ATAPI Block Diagram (x = channel pair 1, 2, 3, 4)
58. Volume control changes are programmable to ramp in increments of
69.
Σ
56.
to a ‘1’. Once out of Power-Down Mode, the pin can be
“Volume Control (addresses 0Fh, 10h, 11h, 12h, 13h,
Table 16 on page 60
A Channel
B Channel
Volume
Volume
Control
Control
“RXP/General-Purpose Pin Control
and
Σ
Figure 8
“Channel Mute (address
MUTE
MUTE
for additional infor-
CS42528
AOUTAx
AOUTBx
“Volume
23