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CDB42L55
5 SYSTEM CONNECTIONS AND JUMPERS
CONNECTOR
EXT. +5V
GND
Ext. Input
GND
AAA
RS232
USB I/O
SPDIF Optical IN
SPDIF Optical OUT
SPDIF COAX IN
SPDIF COAX OUT
MICRO RESET
CS42L55 RESET
FPGA Program
FPGA JTAG
MICRO JTAG
AP PSIA Transmitter
REF
TP9
TP10
TP6
TP7
BT1
BT2
BT3
J95
J94
OPT3
OPT2
J61
J68
S4
S1
S2
J75
J110
J78
INPUT/OUTPUT
Input
Input
Input
Input
Input
Input
Input
Input/Output
Input/Output
Input
Output
Input
Output
Input
Input
Input
Input/Output
Input/Output
Input
SIGNAL PRESENT
+5V power supply
GND reference
+4.5V external power supply for U4 buck regulator
GND reference
Socket for +1.5 V AAA batteries
RS232 serial port connection to PC
USB connection to PC for I2C control port signals
CS8416 digital audio input via optical cable
CS8406 digital audio output via optical cable
CS8416 digital audio input via coaxial cable
CS8406 digital audio input via coaxial cable
Reset for microcontroller (U84)
Reset for CS42L55 (U1)
Reload Xilinx program into the FPGA from Flash (U14)
I/O for programming the FPGA (U5)
I/O for programming the microcontroller (U84)
Digital Outputs to CS42L55 (typically derived from an Audio Precision Pro-
grammable Serial Interface Adapter)
AP PSIA Receiver
J40
Output
Digital I/O from CS42L55 (typically derived from an Audio Precision Pro-
grammable Serial Interface Adapter)
MCLK
SCLK
LRCK
ADC.SDOUT
DAC.SDIN
AIN1B
AIN1A
AIN2B
AIN2A
HP Channel A
HP Channel B
Line Channel A
Line Channel B
HP Stereo Connection
Oscillator
I/O Header
S/W CONTROL
J77
J42
J45
J46
J47
J8
J6
J14
J10
J38
J37
J15
J17
J1
Y1
J104
J109
Input/Output
Input/Output
Input/Output
Output
Input
Input
Input
Input
Input
Output
Output
Output
Output
Output
Input
Input/Output
Intput/Output
Buffered Digital I/O Interface to CS42L55
RCA connectors for analog inputs to CS42L55
RCA connector for headphone analog output from CS42L55
RCA connector for line analog output from CS42L55
Stereo jack for headphone stereo output from CS42L55
Oscillator for providing master clock for system timing
Unbuffered Digital I/O Interface to CS42L55
I/O bus for external I2C control port signals
Table 1. System Connections
DS773DB1
17
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