Cirrus Logic CRD49530-USB - Manual (Page 9)

CRD49530-USB System Description
CRD49530-USB User’s Manual
DS705RD3 Copyright 2008 Cirrus Logic 1-4
1.3.2.3 DC Power Input
• Voltage Range: +9V DC TO +12V DC
• Minimum Power: 8W supply
• Connector Type: 2mm Female, positive center pin
• Reference Designator: J25
1.3.3 Control Header
• Connector Type: 2x25, 0.100 inch Shrouded Male
• Reference Designator: J11
This connector is the interface between the CRD49530 and the CRD USB Master. Control signals, clocks,
data, and +3.3V power are passed across this connector.
1.3.4 On-Board Voltage Selection Headers
• Connector Type: 1x3, 0.100 inch, Stake Header
• Reference Designator: J17 - J19
The CRD49530-USB is designed to operate from a single DC power input. The 9V power supply provided
with the kit is connected to the DC power input jack (J25) and is regulated down to the system voltages
(5V, 3.3V, 1.8V). The power selection headers should be set to the ‘REG’ position when using the DC wall
supply. This is the default mode of operation and should not need to be changed for most applications.
It is possible to bypass the regulated power supplies for any of the voltages by removing the jumper from
the appropriate power selection header, and connecting an external voltage supply to the center pin of
that selection header.
The third configuration for the power selection headers is the ‘EXT’ position. This is a special mode of
operation, and cannot be used while connected to the CRD USB Master control board. Placing the power
selection headers in the ‘EXT’ position while connected to the CRD USB Master will prevent the board
from operating.
The unpopulated header, J3, is also designed for a special mode that brings 12V from the control header,
but cannot be used when connected to the CRD USB Master.
1.3.5 Audio Input Source Multiplexer
• Source 0: CRD USB Master USB Board (This feature is used by engineering development and
debugging purposes.)
• Source 1: CS8416 and CS42448
• Reference Designators: U1, U2
This multiplexer is used to select which audio sources feed the CS4953xx DAI pins. When the on-board
sources (CS8416, U3 and CS42448, U4) are being used, the CRD USB Master data cannot be
processed. Likewise, when the HDMI source (CRD USB Master) is selected, the on-board audio inputs
are disabled.
1.3.6 CS4953xx Audio DSP
The CS4953xx audio DSP (U5) are a family of dual-core processors designed specifically for audio
applications. The CRD49530 allows a designer to evaluate the CS4953xx DSPs in many different modes
of multi-channel input and output. The 144-pin footprint on this board is compatible with any CS4953xx (or
CS497xx) chip that uses the LQFP144 package.