CS5530 datasheet(35/241 Pages) NSC

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Signal Definitions (Continued)

DDC_SDA

I/O

5VT

DDC Serial Data

This is the bidirectional serial data signal for the VESA Display Data

Channel interface. It is used to monitor communications. The DDC2B

standard is supported by this interface.

The direction of this pin can be configured through F4BAR+Memory Off-

set 04h[24]: 0 = Input; 1 = Output.

IREF

(Video DAC)

Analog

VDAC Current Reference Input

Connect a 732 ohm resistor between this pin and AVSS (analog ground

for Video DAC).

VREF

(Video DAC)

Analog

VDAC Voltage Reference Output

Unused DAC output. Connect a 0.1 µF capacitor between this pin and

AVSS (analog ground for Video DAC).

EXTVREFIN

(Video DAC)

Analog

External Voltage Reference Pin

When using an external voltage reference, connect this pin to a 1.235V

voltage reference.

AVDD1 (DAC)

Analog

Analog Power for Video DAC

These pins provide power to the analog portions of the Video DAC.

AVDD2 (VREF)

AVDD3 (DAC)

AVSS1 (DAC)

Analog

Analog Ground for Video DAC

These pins provide the ground plane connections to the analog portions

of the Video DAC.

AVSS2 (ICAP)

AVSS3 (VREF)

AVSS4 (ICAP)

AVSS5 (DAC)

IOUTR

(Video DAC)

Analog

Red DAC Output

Red analog output.

IOUTG

(Video DAC)

Analog

Green DAC Output

Green analog output.

IOUTB

(Video DAC)

Analog

Blue DAC Output

Blue analog output.

Display TFT/TV

FP_DATA17/

MASTER#

Limited ISA Mode: Flat Panel Data Port Line 17

Refer to FP_DATA[15:0] signal description.

ISA Master Mode: Master

Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s def-

inition.

FP_DATA16/

SA_OE#

Limited ISA Mode: Flat Panel Data Port Line 16

Refer to FP_DATA[15:0] signal description.

ISA Master Mode: System Address Transceiver Output Enable

Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s def-

inition.

2.2.11 Display Interface (Continued)

Signal Name

No.

Type

Description

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