LG TracFone LG840G Service Manual page 40

3.5.7.2 Mobile display processor
The MDP is a hardware accelerator primarily responsible for transferring an updated image from the QSC memory sub-
system to the LCD module. The transferring of an updated image is an operation that is shared between software, video
processing, and graphics processing, so a common block helps to reduce redundant circuitry. The MDP is designed with
the assumption that the LCD panel has an embedded
LCD controller and a frame buffer. The image transfer is then the copying of the image from the QSC memory system to
the frame buffer within the LCD module.
While the MDP is transferring an image to the LCD module, it can perform a final set of operations to the image. The set
of operations that the MDP can perform has been chosen to maximize the efficiency of the QSC memory subsystems,
typically removing two or more copy operations of the image to and from memory.
The MDP reduces redundant circuitry and offloads the ARM and aDSP from memory-transfer operations and a certain set
of graphics and video operations
MDP
(DMA)
QSC62x0 device
LGE Internal Use Only
D
M
A
A
G
B
Figure 3.5.7.2.1 MDP-to-LCD interface functional block diagram
LCD IF
EB12
N
A
LCD_RS
N
D
LCD_CS_N
C
EB12_WE_N
N
T
EB12_R_D
R
[15:0]
L
LCD_EN
MDP_VSYNC_PRIMART
(vsync_primary)
- 40 - Copyright © 2012 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
Display Module
LCD_RS
CS/
RW_WR Frame buffer
D[15:0]
LCD_E
LCD Controller
Primary LCD panel
Only for training and service purposes
GU295