SAA7780 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

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SAA7780

ThunderBird Q3D™ PCI Audio Accelerator

Philips Electronics 

Philips Semiconductors

ThunderBird Q3D PCI Audio

Accelerator

Product Specification

SAA7780

DCD#

RI#

152

I-T

UART Data Carrier Detect

The status of this input can be determined by reading bit 7 of the

Modem Status Register. When MSR[7] is read, it will be the inverted

value of DCD#. A change in status of DCD# sets the Delta DCD bit

in the Modem Status Register.

If the DCD# line changes state while the modem status interrupts

are enabled, an interrupt will be generated.

153

I-T

UART Ring Indicator

The status of this input can be determined by reading bit 6 of the

Modem Status Register. When MSR[6] is read, it will be the inverted

value of RI#. Bit 2 (TERI) of the Modem Status Register indicates

whether the RI# input signal has changed from a low to a high, since

the previous reading of the Modem Status Register.

If modem status interrupts are enabled when MSR[6] changes from

a 1 to a 0, an interrupt will be generated.

Joystick/Game Port

JACX

9

JACY

13

JBCX

10

JBCY

12

JAB[2:1]

7

JBB[2:1]

14

I/O-C,S

Joystick A X Axis

Joystick A X-position.

I/O-C,S

Joystick A Y Axis

Joystick A Y-position.

I/O-C,S

Joystick B X Axis

Joystick B X-position.

I/O-C,S

Joystick B Y Axis

Joystick B Y-position.

I-T

Joystick A Button Interface

Joystick A buttons. These buttons are internally de-bounced and de-

glitched using a low speed clock and metastable hardened flip-flops.

I-T

Joystick B Button Interface

Joystick B buttons. These buttons are internally de-bounced and de-

glitched using a low speed clock and metastable hardened flip-flops.

1999 Sep 30

21

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