Crystal CS4281, Programming Manual

Page: 42 / 231

Confidential Draft 3/7/00
CS4281 Programming Manual
42 DS308PRM1
JAB2
Joystick A Button 2
Input with Pullup, Active Low
Button 2 input pin for joystick A.
JBB1
Joystick B Button 1
Input with Pullup, Active Low
Button 1 input pin for joystick B.
JBB2
Joystick B Button 2
Input with Pullup, Active Low
Button 2 input pin for joystick B.
MIDIIN
MIDI Data Input, internal 20 k
Ω
Pullup
This is the serial input pin for the internal MIDI port.
MIDIOUT
MIDI Data Output
This is the serial output pin for the internal MIDI port.
CVDD[2:1]
Core Power
Power
3.3 Volt core power pins.
CGND[3:1]
Core Ground
Ground
Core ground reference pins.
4.3.5 Serial Codec Interface
ABITCLK
AC 97 Bit Rate Clock
Input
Master timing clock for serial audio data. This pin is an input which drives the timing for the AC Link
interface, along with providing the source clock for the DLL.
ASYNC
AC Link Frame Sync
Output
Framing clock for serial audio data. This pin is an output which indicates the 48 kHz framing for the
AC Link. High during slot 0 and low for slots 1 through 12. Also used for a warm reset of the AC
Link.
D
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ft