CS4630 datasheet(22/38 Pages) CIRRUS

22 / 38 page

CS4630

DS445PP1

6. GAME PORT

6.1

MIDI Port

In the AC ’97 controller configuration, a bi-direc-

tional MIDI interface is provided to allow connec-

tion of external MIDI devices. The MIDI interface

includes 16-byte FIFOs for the MIDI transmit and

receive paths.

6.2

Joystick Port

In the AC ’97 controller configuration, a joystick

port is provided. The joystick port supports four

“coordinate” channels and four “button” channels.

The coordinate channels provide joystick position-

al information to the host, and the button channels

provide user button event information. The joystick

interface is capable of operating in the traditional

“polled” mode, but also provides a “hardware ac-

celerated” mode of operation wherein internal

counters are provided to assist the host with coordi-

nate position determination. The Joystick schemat-

ic is illustrated in Figure 13.

+5 V

1nF

5.6 nF

2.2 k

Ω

2.2 k

Ω

2.2 k

Ω

2.2 k

Ω

4.7 k

Ω

5.6 nF

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

JAB1

JBB1

JACX

JBCX

JBCY

JACY

JBB2

JAB2

MIDIOUT

MIDIIN

1nF

1 nF

DSP

Figure 13. Joystick Logic

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