CDB4265 Datasheet, PDF (5/30 Pages) Cirrus Logic – Evaluation Board for CS4265

CDB4265
1.7 External Control Headers
The evaluation board has been designed to allow interfacing with external systems via the headers J15, and
J17.
The 14-pin, 2 row header, J15, provides access to the serial audio signals required to interface to the serial
audio port of the CS4265 with a DSP (see Figure 11).
The direction of the signals on header J15 can be configured using the controls located within the Board
Controls group box on the CDB4265 Controls tab in the provided GUI software.
The 12-pin, 3 row header, J17, allows the user bidirectional access to the SPI/I²C control signals by simply
removing all the shunt jumpers from the “PC” position. The user may then choose to connect a ribbon cable
to the “EXT CONTROL” position. A single “GND” row for the ribbon cable’s ground connection is provided
to maintain signal integrity. Two unpopulated pull-up resistors are also available should the user choose to
use the CDB for the I²C power rail.
1.8 Analog Inputs
RCA connectors supply the CS4265 analog inputs through single-ended, unity gain, active or passive cir-
cuits. Refer to the CS4265 data sheet for the ADC full-scale level.
A 4-pin CD-ROM type header is provided for easily connecting the analog outputs from a CD-ROM drive to
the analog inputs of the CS4265.
1.9 Analog Outputs
The CS4265 analog outputs are routed through a two-pole active filter. The output of the filter is connected
to RCA jacks for easy evaluation.
1.10
Serial Control Port
A graphical user interface is included with the CDB4265 to allow easy manipulation of the registers in the
CS4265, CS8416, and FPGA. See the device-specific data sheets for the CS4265, CS8416, and CD8406
internal register descriptions. The internal register map for the FPGA is located in section 4 on page 11.
Connecting a cable to the RS-232 connector (J19) and launching the Cirrus Logic FlexGUI software (Flex-
Loader.exe) will enable the CDB4265.
Refer to “PC Software Control” on page 7 for a description of the Graphical User Interface (GUI).
1.11 USB Control Port
The USB control port connector (J29) is currently unavailable.
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