CS9210 datasheet(12/39 Pages) NSC

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Revision 3.2

3.0

Functional Description

The Geode CS9210 graphics companion connects to the

TFT port of the CS5530 I/O companion chip (see Figure

3-1). It formats the graphics refresh data for the DSTN dis-

play and controls the refresh of the DSTN LCD.

The CS9210 must be connected to two 60ns EDO

(Extended Data Out) 256Kx16 DRAMs that store a DSTN-

formatted copy of the frame buffer. Pixel data is received

by the pixel port, formatted by a programmable FRM

(Frame Rate Modulator) and dither block, and then stored

in the CS9210 frame buffer. The formatted pixel data is

subsequently read from the DRAMs and used to refresh

the DSTN panel. The panel can be refreshed at 1X or 2X

the input refresh rate, up to a maximum refresh rate of

120Hz. Usingtwo banks of DRAM, theCS9210controls

each bank independently to allow for maximal use of the

DRAM bandwidth and to minimize the amount of on-chip

buffering.

The FRM/dithering formatting is accomplished via a pair

of mapping RAMs. The first is used for FRM coloring; the

second for dithering. The FRM RAM is a 32x64-bit map,

representing 64 frames of data for 32 color patterns. The

dithering RAM is a 16x4x4-bit map, yielding 16 dithering

levels. The RAM-based FRM/dither approach gives the

OEM the most flexibility to tune the FRM and dithering

algorithms for a specific panel.

The FRM and dither maps are loaded, along with the

remaining control registers, through a simple serial pro-

gramming port that connects to the CS5530 I/O compan-

ionchip asillustratedinFigure3-1.Figure3-2 showsan

alternative connection method.

3.1

MODE SELECTION

The CS9210 can be configured for three modes of opera-

tion. The mode selected depends on the type of panel

being connected to the flat panel interface:

• 16-bit DSTN Mode

- Supports DSTN panels with 640x480 or 800x600

resolutions.

• 24-bit DSTN Mode

- Supports DSTN panels with 1024x768 pixel resolu-

tion.

• TFT Pass-Through Mode

- Allows a common connector to be used for TFT LCD

panels and DSTN LCD panels. The system software

can configure the CS9210 to operate in a Pass-

Through mode that presents the digital pixel (RGB)

input data on the UD/LD output pins to drive a TFT

panel on the common connector. The input data is

registered internally before being presented at the

output pins to better control the timing of the panel

interface signals.

Mode selection is programmed via Index 02h, bits 1 and 0

as shown in Table 3-1. Depending on the mode selected,

the panel data that is presented on the UD/LD buses will

vary.

Figure 3-1. CS5530 and CS9210 Signal Connections

GPIOx

FP_ENA_VDD

FP_DISP_ENA_OUT

FP_CLK

FP_HSYNC

FP_VSYNC

FP_DATA[5:0]

FP_DATA[11:6]

FP_DATA[17:12]

SCLK

SDIN

SCS

SDO

ENA_LCDIN

ENA_VDDIN

ENA_DISP

DOTCLK

FP_HSYNC

FP_VSYNC

BLUE[5:0]

GREEN[5:0]

RED[5:0]

Geode™

VCC3

Geode™

CS5530 I/O

CS9210

Companion

Graphics

Companion

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