Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 79
LC4.6E AA
9.
9.8.4
Audio: Lip Sync (Optional)
A “lip sync” circuit with an audio delay can be added (not for all
models/regions), in order to synchronise with video delay due
to the complexity of the display processing. This video delay is
significant, due to memory based processing. For instance, the
“frame rate conversion” cause a delay of two frames, while the
LCD panel response also cause a delay.
The circuit is a (16 bit) FIFO based digital delay. E.g.: the
memory size required for a 80 ms delay (with a data clock of
1.024 MHz) can be calculated with: Memory size = delay time
* f_clk. This gives: 80 ms * 1.024 MHz = 81920 bits.
To calculate the memory size for a 16 bits mode I2S digital
audio stream we must use the following data:
•
f_s = 32 kHz, 16 bits, stereo
•
Data clock = 32 kHz * 16 * 2 = 1.024 MHz
•
Memory size for 1 ms delay = 1 ms * 1.024 MHz = 1024 bits
= 1 kbit
So, the delay time of 80 ms can be built with five steps of 16
ms, which is close to the frame rate. Therefore, a 128 kbit
SRAM (16 x 8) is chosen.
Note that above described calculation is just an example,
values in the set can deviate.
9.9
Control
9.9.1
Hercules
The System Board has two main micro-controllers on board.
These are:
•
On-chip x86 micro-controller (OCM) from Genesis LCD TV/
Monitor Controller.
•
On-chip 80C51 micro-controller from Philips
Semiconductor UOCIII (Hercules) series.
Each micro-controller has it own I
2
C bus which host its own
internal devices.
The Hercules is integrated with the Video and Audio Processor.
For dynamic data storage, such as SMART PICTURE and
SMART SOUND settings, an external NVM IC is being used.
Another feature includes an optional Teletext/Closed Caption
decoder with the possibility of different page storage depending
on the Hercules type number.
The Micro Controller ranges in ROM from 128 kB with no TXT-
decoder to 128 kB with a 10 page Teletext or with Closed
Caption.
9.9.2
Block Diagram
The block diagram of the Micro Controller application is shown
below.
Figure 9-5 Micro Controller block diagram
9.9.3
Basic Specification
The Micro Controller operates at the following supply voltages:
•
+3.3 V
DC
at pins 4, 88, 94, and 109.
•
+1.8 V
DC
at pins 93, 96, and 117.
•
I
2
C pull up supply: +3.3V
DC
.
9.9.4
Pin Configuration and Functionality
The ports of the Micro Controller can be configured as follows:
•
A normal input port.
•
An input ADC port.
•
An output Open Drain port.
•
An output Push-Pull port.
•
An output PWM port.
•
Input/Output Port
The following table shows the ports used for the L04 control:
Table 9-1 Micro Controller ports overview
The description of each functional pin is explained below:
Pin
Name
Description
Configuration
97
INT0/ P0.5
IR
INT0
98
P1.0/ INT1
TV_IRQ
INT2
99
P1.1/ T0
TV_SC_COM
P1.1
102
P0.4/ I
2
SWS
EXT_MUTE
P0.4
103
P0.3/ I
2
SCLK
Lip Sync
I
2
SCLK
104
P0.2/ I
2
SDO2
NVM_WP
P0.2
105
P0.1/ I
2
SDO1
Lip Sync
I
2
SDO1
106
P0.0/ I
2
SDI/O
Lip Sync
I
2
SDI/O
107
P1.3/ T1
PC-TV_LED
P1.3
108
P1.6/ SCL
SCL
SCL
109
P1.7/ SDA
SDA
SDA
111
P2.0/ TPWM
SOUND_ENABLE
P2.0
112
P2.1/ PWM0
(for future use)
-
113
P2.2/ PWM1
(for future use)
-
114
P2.3/ PWM2
SEL_IF
P2.3
115
P3.0/ ADC0
Light Sensor - SDM
ADC0
116
P3.1/ ADC1
STATUS_1
ADC1
119
P3.2/ ADC2
STATUS_2
ADC2
120
P3.3/ ADC3
KEYBOARD
ADC3
122
P2.4/ PWM3
STANDBY
P2.4
123
P2.5/ PWM4
(for future use)
-
126
P1.2/ INT2
(for future use)
-
127
P1.4/ RX
HERC_RESET
-
128
P1.5/ TX
POWER_DOWN
P1.5
HERCULES
SCALER
Tuner
ComPair
NVM
Sound
Amp
MUX
NVM
GPROBE for Debug
or ComPair(Scaler)
SDA
SCL
TV_IRQ
TV_SC_COM
+3V3STBY
1407
1406
1405
PC_DET
SD_PCHD_SEL
PC_HD_SEL
POWER_DOWN
LAMP_ON_OFF
PANEL_PWR_CTL
HD_FILTER
BACK_LIGHT_ADJ1
Flash ROM
83
GPIO2
NVM_WP
IIC BUS 2
93
NVRAM
_SDA
92
NVRAM
_SCL
72
71
187
193
194
85
(GPIO4)
88
(GPIO5)
89
(GPIO6)
68
(PBIAS)
67
(PPWR)
99
(PWM1)
98
(GPIO11/
PWM0)
78 DDC_SDA_VGA
77 DDC_SCL_VGA
82 GPIO1
81 GPIO0
+3V3STBY
111
GPIO23
90 GPIO7
ROM_ADD0-17
ROM_DATA0-7
5 6 7
103 106 107 108
HIGH or
LOW
level input
IIC BUS1
NVM_WP
Sound_Enable
HREC
RST
Sel IF/
SDM
Status1
Light
Sense
TV_IR
RC
P50_LINE_ITV_IR_SW
EXT_MUTE
Standby
POWER
DOWN
127
P1.4
114
P2.3
116
ADC1
115
ADC0
123
P2.5
97
INT0
102
P0.4
122
P2.4
126
INT2
128
P1.5
SDA 109
SCL 108
INT1 98
P1.1 99
Keyboard
ADC3 120
111
P2.0
104
P0.2
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