CS4239 데이터 시트보기 (PDF) - Cirrus Logic

부품명

상세내역

제조사

CS4239

CrystalClear™ Portable ISA Audio System

Cirrus Logic 

CS4239

CrystalClearTM Portable ISA Audio System

Two bits, JR1 and JR0, are located in the Con-

trol register space (CTRLbase+0) for defining

the speed of the Game Port Interface. Four dif-

ferent rates are software selectable for use with

various joysticks and to support older software

timing loops with aliasing (roll-over) problems.

The Game Port hardware interface consists of

8 pins that connect directly to the standard game

port connector. Buttons must have a 1000 pF ca-

pacitor to ground and have internal 20 kΩ

pullups resistors. X/Y coordinates must have a

5.6 nF capacitor to ground and a 2.2 kΩ series

resistor to the appropriate joystick connector pin.

Figure 5 illustrates the schematic to the joystick

connector.

CRYSTAL

CODEC

VDF

1

9

JAB1

2

JBB1

10

JACX

2.2 k Ω

3

JBCX

2.2 k Ω

11

5.6 nF

5.6 nF

1 nF

1 nF

4

12

JBCY

JACY

5

2.2 k Ω

13

2.2 k Ω

6

JBB2

14

JAB2

7

MIDOUT

15

5.6 nF 5.6 nF 1 nF 1 nF

8

MIDIN

Figure 5. Joystick Logic

DS253PP2

57

Share Link: