cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 103

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

Joystick/DSP Serial Port Interface
JACX, JACY - Joystick A Coordinates, Input
JAB1, JAB2 - Joystick A Buttons, Input
JBCX/SDOUT - Joystick B Coordinate X/Serial Data Output, Input/Output
JBCY/SDIN - Joystick B Coordinate Y/Serial Data Input, Input
JBB1/FSYNC - Joystick B Button 1/Frame Sync, Input/Output
JBB2/SCLK - Joystick B Button 2/Serial Clock, Input/Output
DS213PP4
These pins and are the X/Y coordinates for Joystick A. They should have a 5.6nF capacitor to
ground and a 2.2k
These pins are the switch inputs for Joystick A. They should be connected to joystick connector
pins 2 and 7, respectively; as well as have a 1nF capacitor to ground, and a 4.7k
resistor.
When this pin is used as a second joystick, it is the X coordinates input for Joystick B; and
should have a 5.6nF capacitor to ground and a 2.2k
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data output. The DSP
serial port SDOUT pin can be switched to XD3 via the SPS bit. This would facilitate using the
DSP serial port and the second joystick simultaneously.
When this pin is used as a second joystick, it is the Y coordinates input for Joystick B; and
should have a 5.6nF capacitor to ground and a 2.2k
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data input. The DSP serial
port SDIN pin can be switched to XD2 via the SPS bit. This would facilitate using the DSP
serial port and the second joystick simultaneously.
When this pin is used as a second joystick, it is the switch 1 input for Joystick B; and should be
connected to joystick connector pin 10; as well as have a 1nF capacitor to ground, and a 4.7k
pullup resistor. When the serial port is enabled, SPE = 1 in I16, this pin is the serial frame sync
output. The DSP serial port FSYNC pin can be switched to XD4 via the SPS bit. This would
facilitate using the DSP serial port and the second joystick simultaneously.
When this pin is used as a second joystick, it is the switch 2 input for Joystick B; and should be
connected to joystick connector pin 14; as well as have a 1nF capacitor to ground, and a 4.7k
pullup resistor. When the serial port is enabled, SPE = 1 in I16, this pin is the serial clock
output. The DSP serial port SCLK pin can be switched to XD1 via the SPS bit. This would
facilitate using the DSP serial port and the second joystick simultaneously.
resistor to the joystick connector pins 3 and 6, respectively.
resistor to the joystick connector pin 11.
resistor to the joystick connector pin 13.
CS4237B
pullup
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