CDB4270 Cirrus Logic Inc, CDB4270 Datasheet - Page 12

• Manufacturer Part Number: CDB4270
• Description: BOARD EVAL FOR CS4270 CODEC
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4270

• Main Purpose: Audio, CODEC
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: CS4270
• Primary Attributes: Stereo, 24-Bit, 192 kHz Sample Rate
• Secondary Attributes: I²S, S/PDIF Inputs and Outputs, Analog Inputs and Outputs, GUI
• Description/function: Audio CODECs
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS4270
• 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: 598-1002

12
2.5
.
OSC
External MCLK Control
Several sources for MCLK exist on the CDB4270. The crystal oscillator, Y1, will master the MCLK bus when
no S/PDIF signal is input to the CS8416 (refer to the CS8416 data sheet for details on OMCK operation).
When S/PDIF data is present at the CS8416 input, the CS8416 generates a master clock whenever its in-
ternal PLL is locked to the incoming S/PDIF stream.
The DSP Header can master the MCLK bus or be an observation point for MCLK depending upon the state
of the driver control signals from the FPGA.
Refer to the Register Description section of this document for a description of the MCLK routing control reg-
isters.
OMCK
DSP Header
CS8416
CS8406
OMCK
RMCK
MCLK
Figure 6. External MCLK Control
MCLK.FROM.8416
MCLK.TO.HDR
MCLK.FROM.HDR
MCLK
FPGA
MCLK
CS4270
CDB4270
DS686DB3