CS4239-JQ CIRRUS [Cirrus Logic], CS4239-JQ Datasheet - Page 87

• Manufacturer Part Number: CS4239-JQ
• Manufacturer: CIRRUS [Cirrus Logic]

Joystick Interface
JACX, JACY - Joystick A Coordinates, Input
JAB1, JAB2 - Joystick A Buttons, Input - Internal Pullups
JBCX, JBCY - Joystick B Coordinates, Input
JBB1, JBB2 - Joystick B Buttons, Input - Internal Pullups
CS4610 DSP Serial Port Interface
The CS4610 DSP serial port pins are shared with the CS9236 Wavetable serial port. When the serial
port is enabled, SPE = 1 in I16, these pins are forced to the CS4610 DSP interface.
FSYNC - Frame Sync, Output
SCLK - Serial Clock, Output (CDROM Enable)
SDOUT - Serial Data Output, Output (Alternate CDROM Chip Select Enable)
SDIN - Serial Data Input, Input
DS253PP2
These pins are the X/Y coordinates for Joystick A. They should have a 5.6 nF capacitor to
ground and a 2.2 k
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 1 nF capacitor to ground.
These pins and are the X/Y coordinates for the second joystick, Joystick B. They should have a
5.6 nF capacitor to ground and a 2.2 k
respectively.
These pins are the switch inputs for the second joystick, Joystick B. They should be connected
to joystick connector pins 10 and 14, respectively; as well as have a 1 nF capacitor to ground.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial frame sync output.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial clock output. At power-up,
this pin is an input (with an internal 100 k
resistor to SGND, enables the CDROM interface (over the upper 4 ISA address pins). Loading
must be limited to CMOS inputs if this pin has the 10 k resistor attached.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data output. At power-up,
this pin is an input (with an internal 100 k
resistor to SGND, enables the alternate CDROM chip select pin ACDCS. Loading must be
limited to CMOS inputs if this pin has the 10 k resistor attached.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data input.
resistor to the joystick connector pins 3 and 6, respectively.
resistor to the joystick connector pins 11 and 13,
pullup) that, when pulled low with a 10 k
pullup) that, when pulled low with a 10 k
CrystalClear Portable ISA Audio System
TM
CS4239
87