Passport 5-Lead, 5L, LT, XG Service Manual
0070-00-0420
2 - 63
Theory of Operation
Block Diagrams
2.2.10
Panel Board / Display Interface
FIGURE 2-28
Panel Board Block Diagram
Overview
The Front Panel Board contains a frame buffer converter that takes a video data stream
formatted as 640x240 at 60Hz and converts it to a 640x480 format at 120Hz. The single
video bit stream is also converted to a dual scan LCD type 8-bit parallel interface required by
the EL panel. Appropriate timing signals are also generated to control the EL panel.
An optional alternate interface circuit is included to drive an alternate color LCD panel. Three
color signals (RGB) at 640x240 format at 60Hz and I signal are double scanned using a
video line buffer memory to drive the color LCD panel with a 640x480 format at 60Hz.
Monochrome EL Interface
The monochrome EL panel interface (0670-00-0617-03) consists of two control EPLD’s
(U1,U2) and a dual-port VRAM. The two EPLD’s in essence perform the functions of a simple
video display controller. The input video data is written into the video memory; the output
video data is simultaneously accessed and sent to the EL panel.
The parallel access port of the VRAM is used to write the input video data into memory. As
such, the parallel data port is used only in the write mode. On the other hand, the serial
access port is used only in the read mode to access the video output data. To simplify the
video output logic and timing, the input video data is formatted appropriately before it is
written into the VRAM, while the output video data is clocked directly from the VRAM to the
EL panel.
Battery Charging LED Control Circuitry
Alarm LED
Control
Circuitry
Res.
Network
Power Supply
12 Volt output
15 Watts
VRAM
256K x 8
Frame
Buffer
Interface
Control
Res.
Network
RES.
Network
Res.
Network
WI(8:1)
A(8:0)
RAS
CAS
WB
Scan start-up
Input Data Latch
Data Input Clock
VideoDataU(3:0)
VideoDataL(3:0)
KI(3:0)
KD(7:0)
KI(3:0)
KD(7:0)
SPK+
SPK -
Frame Signal
Data Latch Signal
BAT_A+_F
BA_CHG_A
BAT_B+_F
BAT_CHG_B
+17V
LED0
SW_BULK_OUT
BULK_GND
Clock
Display Data(7:3)
Display Data (3)
PS12V
BULK_GND
Res.
Pullup
+5V
+12V
Res.
Pullup
SPK+
SPK-
+12V
A5V
DGND
DGND
Alarm LED+
Alarm LED-
BC LED+
BC LED-
Clock
Doubler
Line
Buffer
Interface
Control
Video
Line
Memory
Buffer
Video Data(3:0)
Horizontal Syc.
Video Clock
Vertical Syc.
PS12v
BULK_GND
A5V
+5V
WRCLK
WRST1*
RRST1*
DHSYNC
DT
Jumper
Содержание Passport 5-Lead
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