Cirrus Logic CRD44800-ST-FB - Manual (Page 4)

CRD44800-ST-FB
4
2. OPERATION INFORMATION
Switches and Indicators (Located on the Driver Board):
RESET Pushbutton (S1) - forces a complete system reset.
MUTE Pushbutton (S2) - mutes the audio output of the CRD44800-ST-FB, but the PWM output
stage will continue switching.
RAMP UP/DN Pushbutton (S3) - enables/disables the PWM output stage from switching.
MUTE LED (D16) - indicates that the audio output is muted. The MUTE LED is also used during
CRD44800-ST-FB initialization (see below).
FAULT LED (D19) - indicates several types of fault conditions. If one (or more) of the PWM out-
puts is shorted, or the PWM back end overheats, the FAULT LED will light. Also, if either the
Optical or Coax digital input is selected as the system input and a valid digital signal is not
present, the FAULT LED will light. The FAULT LED is also used during CRD44800-ST-FB ini-
tialization (see below).
S/PDIF ERROR LED (D6) - indicates the absence of a valid S/PDIF signal into the CS8416.
Stand-alone Operation
The CRD44800-ST-FB evaluation system is prewired for stand-alone operation. The SMPS is a
universal input, 90-260VAC, 50/60Hz.
1) Attach the supplied power cord to the power entry module. Do not turn on the power yet.
2) Configure jumper J10 for the desired volume control mode. If J10 is in, the gain of the
CS44800 will be forced to 0dB, irrespective of the position of the volume control pot. If J10 is
out, the volume control pot determines the CS44800 gain.
3) Configure jumpers J17 and J18 for the desired mode of operation. The first three options are
stand-alone, while the final option is remote.
4) If the Analog input mode is selected, configure jumpers J6 and J7 to select the sampling fre-
quency for the CS5341s.
5) Supply either analog signals (if the Analog input option is selected) or either coaxial or optical
digital PCM inputs (if the digital S/PDIF option is selected).
Function J17 J18
Analog Inputs 1 - 2 1 - 2
Coaxial S/PDIF 2 - 3 1 - 2
Optical S/PDIF 1 - 2 2 - 3
Remote Mode 2 - 3 2 - 3
Sample Rate (Fs) J6 J7
48 kHz 2 - 3 2 - 3
96 kHz 1 - 2 2 - 3
192 kHz 2 - 3 1 - 2