CS9211 datasheet(14/62 Pages) NSC

14 / 62 page

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Revision 2.1

3.0

Functional Description

This chapter discusses the detailed operations of the

CS9211 in two categories: system-level and the opera-

tions/programming of the major functional blocks.

3.1

SYSTEM INTERCONNECTIONS

The system-level discussion topics revolve around events

that affect the device as a whole unit and how the CS9211

connects/interfaces

with

other

system

devices

(i.e.,

CS5530A, panel, memory, and crystal oscillator).

3.1.1

CS550A Connections

The CS9211 graphics companion connects to the TFT

graphics data port of the CS550A I/O companion chip, as

shown in Figure 3-1. In order for this interface to function,

the CS550A must be in the “Limited ISA Mode”, not the

“ISA Master Mode”, as discussed in the CS550A data

book.

mands are delivered to the CS9211 by means of a GPIO

interface. The GPIOs can come from any device capable of

controlling those signals, as described in Section 3.2.1

"Serial Interface" on page 17. For example, National’s

SuperI/O (PC97317) also produces compatible GPIO sig-

nals.

The CS9211 reformats the incoming pixel data stream and

produces an output data stream that is directly compatible

with the attached LCD panel.

Timing and power sequence control signals are delivered

to the CS9211 from the CS550A. Various “pass-through” or

“internal/external” selection modes of the CS9211 allow

those external signals to be used or modified internally,

before being passed on to the panel, or ignored completely,

in which case they would be generated internally.

The CS9211 receives a pixel data stream from the

CS550A. The chief function of the CS9211 is to reformat

this received input stream into an output stream suitable for

display on the LCD panels it supports.

Figure 3-1. CS550A and CS9211 Signal Connections

GPIO4

GPIO5

GPIO6

GPIO7

FP_ENA_VDD

FP_DISP_ENA_OUT

FP_CLK

FP_HSYNC_OUT

FP_VSYNC_OUT

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™

CS5530A

I/O Companion

CS9211

Graphics

Companion

Serial

Interface

FP_ENA_BKL

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