CS4281 데이터 시트보기 (PDF) - Cirrus Logic

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CS4281

CrystalClear™ PCI Audio Interface

Cirrus Logic 

CS4281

CrystalClear™ PCI Audio Interface

MIDI PORT

A bi-directional MIDI interface allows connection of external MIDI devices. The MIDI interface includes

a 16-byte FIFO for the MIDI receive path. A MIDI buffer (see Figure 11) is recommended due to some

joystick manufactures grounding the MIDIOUT pin.

MIDIOUT

CS4281

39k

39k

3.3V

MMBT2907ALT1

10k

5V

Joystick

Connector

5.1k

MIDIOUT

(Buffered)

20k

MMBT3904LT1

Figure 11. MIDIOUT Buffer

JOYSTICK PORT

The joystick port supports four “coordinate” channels and four “button” channels. The coordinate channels

provide joystick positional information to the host, and the button channels provide user button event in-

formation. The Joystick schematic is illustrated in Figure 12.

CS4281

+5 V

1

4.7 k Ω

4.7 k Ω

9

JAB1

2

JBB1

10

JACX

2.2 k Ω

3

JBCX

2.2 k Ω

11

12 nF

12 nF

1 nF

4

1 nF

12

JBCY

JACY

JBB2

JAB2

4.7 k Ω

MIDIOUT

4.7 k Ω 4.7 k Ω

5

2.2 k Ω

13

2.2 k Ω

6

14

7

15

12 nF 12 nF 1 nF 1 nF

8

MIDIIN

Figure 12. Joystick Logic

CIRRUS LOGIC PRODUCT DATA SHEET

22

DS308PP4

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