LCD & VGA Controllers
11-2
GMS30C7201 Data Sheet
11.1 Overview
The VGA and LCD controllers provide the video output capabilities of the
GMS30C7201. The VGA and LCD controllers can be used simultaneously, and can
display either the same image, or entirely different images. If the images are the same
for the two displays, and the frame rates required are also the same, then it is possible
to use the same frame buffer for both controllers. If either the images are different, or
different frame rates are required, then it is necessary to use two frame buffers, or one
frame buffer, but with two DMA channels. In either case, the DMA bandwidth required
for the two video sub-systems is the sum of the bandwidth for each display, whereas if
the two images and the frame rates are the same, then only one DMA channel is used,
and the DMA data is shared between the two controllers.
11.1.1 LCD features
Single panel color and monochrome STN displays
TFT color displays
Resolution programmable up to 640x480
Single panel mono STN displays with either 4- or 8-bit interfaces
15 grey-level mono support, 3375 color STN support
4bpp mono, 4 or 8bpp palettized color displays
12bpp color
‘
true-color
’
non-palettized color displays
Programmable timing for different display panels
3 x 256 entry, 4-bit palette RAM
Patented grayscale algorithm
Little-endian operation
The controller does
not
support dual panel STN displays.
There is no hardware cursor support, since WinCE does not use a cursor.
Note
11.1.2 VGA features
Resolution programmable up to 800x600 resolution (640x480 maximum for
simultaneous display mode)
Programmable border color
Programmable VGA timing
On-chip video DACs for direct drive of a monitor
Option to share video data with LCD interface
4bpp, 8bpp and 16bpp modes
5:5:5 and 5:6:5 16bpp
‘
true-color
’
modes
3 x 256 entry 8-bit palette RAM
Patented technique for selecting 2
16
colors from 2
24
colors in 16bpp mode
Little-endian operation
The controller does
not
support interlaced displays. It supports non-interlaced monitor
output only, and therefore cannot be used as a television display.
There is no hardware cursor support, since WinCE does not use a cursor.
Note