Figure 3-33. Display Circuit Detail Overview Block Diagram - Motorola APX 5000 Service Manual

3-46
3.2.6.2 APX 5000/ APX 6000/ APX 6000XE/ SRX 2200 LCD Display Modules
3.2.6.2.1 QVGA
The APX 5000/APX 6000/APX 6000XE/SRX 2200 radio can have up to 2 displays (QVGA and
FSTN) depending upon the particular feature set and radio model ordered. The main Transflective
1.6" color display is a QVGA (130 x RGB x 130) active matrix TFT (Thin Film Transistor) LCD. A
display flex connects the front display to the J2304 22-pin connector on VOCON board. The QVGA
display uses the 8-bit Special optimized Screen Interface (SoSSI) for data and commands.
1.85V
V-REG
VOUT
OMAP
(R/W) LCD_HSYNC
(D/C) LCD_AC
(CLK 4MHz) LCD_PCLK
RST_OUT
(RST)
(D0) LCD_PIXEL_0
(D1)
LCD_PIXEL_1
LCD_PIXEL_2
(D2)
(D3)
LCD_PIXEL_3
(D4) LCD_PIXEL_4
(D5) LCD_PIXEL_5
(D6)
LCD_PIXEL_6
(D7)
LCD_PIXEL_7
The QVGA LCD Module operates using V_2.775D and V_EXT_1.85. The V_2.775D is the module's
analog supply voltage sourced by LDO6 of MAKO. The V_EXT_1.85 is the module's IO voltage
sourced by the 1.85V external LDO regulator. An 8-bit parallel bus is used for data and command
communication between OMAP's SoSSI interface and LCD driver IC. The F_DISP_DATA_CMD
signal indicated the type of data being sent to the driver. A '0' corresponds to command data and a
'1' corresponds to display data. Data only travels in one direction, from OMAP to display driver.
Therefore F_DISP_RW line will always be low. Display data is latched on the falling edge of the
F_DISP_RW_EN signal.
The SoSSI interface uses the LCD DMA controller/bus to allow the LCD module to access system
memory. Therefore the transfer of pixel data process will require less CPU processing power. An
initiate DMA transfer command is used and display data is transferred to the LCD module
automatically without intervention thus offloading the processor.
DNP
CPLD (INVERT)
IO39
IO87
0 Ω
DNP
MAKO
(V_2.775D)
(BOARD ID)

Figure 3-33. Display Circuit Detail Overview Block Diagram

DISPLAY
FLEX CONNECTOR
J2304 PINS
V_EXT_1.85 (.004mA TYP.)
12
47 Ω
F_DISP_RW
3
F_DISP_DATA_CMD
8
47 Ω
F_DISP_RW_EN (CLK)
18
47 Ω
OMAP_RESET
19
47 Ω
F_DISP_DATA_0
14
F_DISP_DATA_1
4
F_DISP_DATA_2
15
F_DISP_DATA_3
5
F_DISP_DATA_4
16
F_DISP_DATA_5
6
F_DISP_DATA_6
17
F_DISP_DATA_7
7
V06_O
V_2.775D (.68mA TYP.)
2
10k Ω
ATOD_5
F_DISP_BD_ID
22
Theory of Operation
: Controller
To display driver (NT39123)
on display module.