RM0319 datasheet(274/368 Pages) STMICROELECTRONICS

274 / 368 page

LCD display controller (CLCD)

RM0319

274/368

Doc ID 022640 Rev 3

24.4

Functional description

Figure 96 shows the block diagram of CLCD.

Figure 96.

CLCD block diagram

24.4.1

AHB slave interface

The AMBA AHB slave interface connects the CLCD to the AMBA AHB bus and provides

CPU accesses to the registers and palette RAM. For more information on AMBA AHB slave

interfaces, refer to the AMBA specification (Rev 2.0).

The following features are supported by the CLCD AMBA AHB slave interface:

●

Standard write and read AMBA AHB accesses

●

INCR4, INCR8, and undefined length WORD bursts only

●

OKAY response only.

24.4.2

AHB master interface

The AMBA AHB master interface transfers display data from a memory to the CLCD DMA

FIFOs.

The inherent AMBA AHB master interface state machine performs the following functions:

●

Loads the upper panel base address into the AMBA AHB address incrementor on

recognition of a new frame.

●

Monitors both the upper and lower DMA FIFO levels and asserts HBUSREQM to

request display data from memory, filling them to above the programmed water mark.

AHB

Master

Interface

Upper

Panel

DMA FIFO

Input

FIFO

Control

Lower

Panel

DMA FIFO

Pixel

Serializer

Palette

(128x32)

Gray

Scaler

Upper

Panel

Output FIFO

Upper

Panel

Formatter

Lower

Panel

Formatter

Lower

Panel

Output FIFO

STN/

TFT

data

select

AHB

Slave

Interfac

Control

And

Status

Panel

Clock

generator

Timing

Controller

Interrupt

generation

Interrupts

FIFO Underflow

AHB

errors

AHB

BUS

LCD

panel

clock

LCD

panel

control

LCD

panel

data

TFT

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