ARM ARM DUI 0224I manual Display resolutions and display memory organization, Chip, Vga

Models: ARM DUI 0224I

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Programmer’s Reference

4.7.1PrimeCell Modifications

The register map for the variant of the PL110 used in the ARM926EJ-S PXP Development Chip is not the same as that listed for the standard PL110. The differences are listed in Table 4-28.

 

 

 

Table 4-28 PrimeCell CLCDC register differences

 

 

 

 

Address

Reset value

Description in PL110

 

(Dev.

Difference

(Dev. Chip)

TRM

Chip)

 

 

 

 

 

 

 

 

0x10120018

0x0

LCDControl, LCD panel

CLCDC TRM lists address as 0x1012001C

 

 

pixel parameters

 

 

 

 

 

0x1012001C

0x0

LCDIMSC, interrupt mask

CLCDC TRM lists address as 0x10120018

 

 

set and clear

 

 

 

 

 

0x10120800–

0x0

Not present

Hardware cursor registers from PL111 (see the

0x10120C2C

 

 

ARM926EJ-S Technical Reference Manual for details)

 

 

 

 

0x10120FE0

0x93

CLCDPeriphID0

CLCDC TRM lists value as 0x10

 

 

 

 

0x10120FE4

0x10

CLCDPeriphID1

CLCDC TRM lists value as 0x11

 

 

 

 

4.7.2Display resolutions and display memory organization

Different display resolutions require different data and synchronization timing. Use registers CLCD_TIM0, CLCD_TIM1, CLCD_TIM2, and SYS_OSCCLK4 to define the display timings. Table 4-29 lists the register and clock values for different display resolutions.

Table 4-29 Values for different display resolutions

 

CLCDCLK frequency

CLCD_TIM0

CLCD_TIM1

CLCD_TIM2

Display resolution

and SYS_OSCCLK4

register at

register

register at

 

register value

0x10120000

0x10120004

0x10120008

 

 

 

 

 

QVGA(240x320) (portrait) on VGA

25MHz, 0x2C77

0xC7A7BF38

0x595B613F

0x04eF1800

 

 

 

 

 

QVGA (320x240) (landscape) on

25MHz, 0x2C77

0x9F7FBF4C

0x818360eF

0x053F1800

VGA

 

 

 

 

 

 

 

 

 

QCIF (176x220) (portrait) on VGA

25MHz, 0x2C77

0xe7C7BF28

0x8B8D60DB

0x04AF1800

 

 

 

 

 

VGA (640x480) on VGA

25MHz, 0x2C77

0x3F1F3F9C

0x090B61DF

0x067F1800

 

 

 

 

 

4-48

Copyright © 2003-2010 ARM Limited. All rights reserved.

ARM DUI 0224I

Page 214
Image 214
ARM ARM DUI 0224I Display resolutions and display memory organization, PrimeCell Clcdc register differences, Chip, Vga