32580B

Signal Definitions

 

 

3.4.4CRT/TFT Interface Signals

Signal Name

 

Ball No.

Type

Description

Mux

 

 

 

 

 

 

DDC_SCL

 

Y1

O

DDC Serial Clock. This is the serial clock for the VESA

IDE_DATA10

 

 

 

 

Display Data Channel interface. It is used for monitor

 

 

 

 

 

communications. The DDC2B standard is supported by

 

 

 

 

 

this interface.

 

 

 

 

 

 

 

DDC_SDA

 

Y2

I/O

DDC Serial Data. This is the bidirectional serial data sig-

IDE_DATA9

 

 

 

 

nal for the VESA Display Data Channel interface. It is

 

 

 

 

 

used for monitor communications. The DDC2B standard

 

 

 

 

 

is supported by this interface.

 

 

 

 

 

 

 

HSYNC

 

A11

O

Horizontal Sync

---

 

 

 

 

 

 

VSYNC

 

B11

O

Vertical Sync

---

 

 

 

 

 

 

VREF

 

D16

I/O

Voltage Reference. Reference voltage for CRT PLL and

---

 

 

 

 

DAC. This signal reflects the internal voltage reference. If

 

 

 

 

 

internal voltage reference is used (recommended), leave

 

 

 

 

 

this ball disconnected. If an external voltage reference is

 

 

 

 

 

used, this input is tied to a 1.235V reference.

 

 

 

 

 

 

 

SETRES

 

B15

I

Set Resistor. This signal sets the current level for the

---

 

 

 

 

RED/GREEN/BLUE analog outputs. Typically, a 464Ω,

 

 

 

 

 

1% resistor is connected between this ball and AVSSCRT.

 

On-Chip RAMDAC

 

 

 

 

 

 

 

 

 

RED

 

B12

O

Analog Red, Green and Blue

---

 

 

 

 

 

 

GREEN

 

A14

 

 

---

 

 

 

 

 

 

BLUE

 

A15

 

 

---

 

 

 

 

 

TFT (External DAC) Interface

 

 

 

 

 

 

 

 

TFTDCK

 

AA1

O

TFT Clock. Clock to external CRT DACs or TFT.

IDE_RST#

 

 

 

 

 

 

 

 

A10

 

 

GPIO17+ IOCS0#

 

 

 

 

 

 

TFTDE

 

P2

O

TFT Data Enable. Can be used as blank signal to exter-

IDE_CS1#

 

 

 

 

nal CRT DACs.

 

 

 

B18

 

ACK#+FPCICLK

 

 

 

 

 

 

 

 

 

 

FP_VDD_ON

 

AB1

O

TFT Power Control. Used to enable power to the Flat

IDE_DATA4

 

 

 

 

Panel display, with power sequence timing.

 

 

 

V30

 

GXCLK+TEST3

 

 

 

 

 

 

 

 

 

 

TFTD[17:0]

 

See

O

Digital RGB Data to TFT.

The TFT interface is

 

 

Table 3-3

 

TFTD[5:0] - Connect to BLUE TFT inputs.

muxed with the IDE

 

 

on page

 

TFTD[11:6] - Connect to GREEN TFT inputs.

interface or the Par-

 

 

41.

 

TFTD[17:12] - Connect to RED TFT inputs.

allel Port. See Table

 

 

 

 

 

3-5 on page 46 and

 

 

 

 

 

Table 3-6 on page

 

 

 

 

 

48 for details.

 

 

 

 

 

 

3.4.5ACCESS.bus Interface Signals

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

AB1C

N31

I/O

ACCESS.bus 1 Serial Clock. This is the serial clock for

GPIO20+DOCCS#

 

 

 

the interface.

 

 

 

 

Note: If selected as AB1C function but not used, tie

 

 

 

 

AB1C high.

 

 

 

 

 

 

 

 

 

 

 

56

 

 

AMD Geode™ SC2200 Processor Data Book

Page 52
Image 52
AMD SC2200 manual 4 CRT/TFT Interface Signals, ACCESS.bus Interface Signals