CS4235 Datasheet, PDF (85/94 Pages) Cirrus Logic – CrystalClear Low Cost ISA Audio System

CS4235
CrystalClear ^TM Low Cost ISA Audio System
Joystick Interface
JACX, JACY - Joystick A Coordinates, Input
These pins are the X/Y coordinates for Joystick A. They should have a 5.6 nF capacitor to
ground and a 2.2 kΩ resistor to the joystick connector pins 3 and 6, respectively.
JAB1, JAB2 - Joystick A Buttons, Input - Internal Pullups
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.
JBCX, JBCY - Joystick B Coordinates, Input - Internal Pullups
These pins 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 kΩ resistor to the joystick connector pins 11 and 13,
respectively.
JBB1, JBB2 - Joystick B Buttons, Input
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.
CS4610 DSP Serial Port Interface
FSYNC - Frame Sync, Output, 4 mA drive
When the serial port is enabled, SPE = 1 in I16, this pin is the serial frame sync output.
SCLK - Serial Clock, Output, 4 mA drive
When the serial port is enabled, SPE = 1 in I16, this pin is the serial clock output.
SDOUT - Serial Data Output, Output, 4 mA drive (Alternate CDROM Chip Select Enable)
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 kΩ pullup) that, when pulled low with a 10 kΩ
resistor to SGND, enables the alternate CDROM chip select pin ACDCS. Loading must be
limited to CMOS inputs if this pin has the 10 kΩ resistor attached.
SDIN - Serial Data Input, Input
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data input.
CS9236 Wavetable Serial Port Interface
A digital interface to the CS9236 Single-Chip Wavetable Music Synthesizer is provided that
allows the CS9236 PCM audio data to be summed on the CS4235 without the need for an
external DAC. This serial port is enabled via the WTEN bit which is located in the Global
Configuration byte in the E²PROM Hardware Configuration data, or C8.
DS252PP2
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