CL-PS7500FE 查看數據表（PDF） - Cirrus Logic

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CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

CL-PS7500FE

System-on-a-Chip for Internet Appliance

Appendix B

B.Dual-Panel Liquid Crystal Displays

1. Programming the Video Subsystem

EREG[13] (lcd) must be programmed to ‘1’ for normal LCD operation. CONREG[13] (address

0xE00xxxxx) must be programmed to ‘1’. This is the dup bit to set Duplex mode.

Video data is simultaneously channelled to the top and bottom half-screens. The first qword received from

memory is interpreted for the first part of the first raster in the top half-screen; the second qword is for the

identical part of the lower half-screen. CL-PS7500FE handles the sequencing of DMA data so the video

buffer can still be programmed as if there were only one panel.

Program VCSR[14:13] (address 0x9600xxxx) as:

Bit

Description

14 13

0

0 Dual Panel mode not activated

0

1 Cursor in upper half-screen

1

0 Cursor in lower half-screen

1

1 Cursor straddles both half-screens

Normally VCSR defines the number of rasters from VSYNC to the start of the cursor, and VCER defines

the number of rasters from VSYNC to the end of the cursor display. See Chapter 16 for programming

details.

Split-screen Operation

For split-screen operation, the programming of VCER and VCSR is the same as for a single-panel LCD

when the cursor is in the top or bottom half-screen. When the cursor straddles the boundary, the values

of these two registers have a different meaning. The value in the VCSR is the number of rasters from the

top of the lower panel to the end of the cursor image and VCER is programmed with the number of rasters

from the top of the display to the start of the cursor image in the upper panel.

The cursor is displayed in the lower half-screen from the value of VDSR to VCSR and in the upper half-

screen from the value of VCER to VDER. Essentially, the start register is effectively defining the ‘end’ of

the cursor in the bottom half-screen and the end register is defining the ‘start’ of the cursor in the top half-

screen. This is because the top of the lower half-screen is written to before the bottom of the upper half-

screen.

June 1997

ADVANCE DATA BOOK v2.0

229

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