106
8575
8575
A N/B Maintenance
A N/B Maintenance
5.4 SiS301LV / Chrontel CH7019 TV/LVDS Encoder
Pin #
Type
Symbol
Description
66,101 In/Out
H1,H2
Horizontal Sync Input / Output
When the SYO control bit is low, these pins accept a horizontal
sync inputs for use with the input data. The amplitude will be 0 to
VDDV. VREF1 is the threshold level for these inputs. These pins
must be used as inputs in RGB Bypass mode.
When the SYO control bit is high, the TV encoder will output a
horizontal sync pulse 64 pixels wide to one of these pins. The
output is driven from the DVDD supply. This output is valid only
when TV-Out is in operation.
65,102 In/Out
V1,V2
Vertical Sync Input / Output
When the SYO control bit is low, these pins accept a vertical sync
inputs for use with the input data. The amplitude will be 0 to
VDDV. VREF1 signal is the threshold level. These pins must be
used as inputs in RGB Bypass mode.
When the SYO control bit is high, the TV encoder will output a
vertical sync pulse one line wide to one of these pins. The output
is driven from the DVDD supply. This output is valid only when
TV-Out is in operation.
63,104 In
DE1,DE2 Data
Enable
These pins accept a data enable signal which is high when active
video data is input to the device, and remains low during all other
times. The levels are 0 to VDDV. VREF1 is the threshold level.
One of these inputs is used by the LVDS links. The TV-Out
function uses H and V sync signals and values in the SAV register
as reference to active video.
62,105
Out
FLD/STL1
FLD/STL2
TV Field / Flat Panel Stall Signal
These outputs can be programmed to be either a TV Field output
from the TV encoder or a Stall output from the flat panel
Up-scaler. These outputs are tri-stated upon power up.
107 In/Out
SPD
Serial Port Data Input / Output
This pin functions as the bi-directional data pin of the serial port,
and uses VREF2 / 2 as the threshold voltage. VREF2 divide by 2
function is generated on-chip.
108 In
SPC
Serial Port Clock Input
This pin functions as the clock input of the serial port and uses
VREF2 / 2 as the threshold voltage. VREF2 divide by 2 function is
generated on-chip.
106 In
AS
Address Select
(Internal Pull-up)
This pin determines the device address of the serial port.
Pin #
Type
Symbol
Description
112 In/Out
SDD
Low-Voltage DDC Serial Data
Low-voltage serial data for DDC. It uses VREF2 / 2 as the
threshold voltage. VREF2 divide by 2 function is generated
on-chip.
113 In/Out
SDC
Low-Voltage DDC Serial Clock
Low-voltage serial clock for DDC. It uses VREF2 / 2 as the
threshold voltage. VREF2 divide by 2 function is generated
on-chip.
114,116 In/Out
DD1, DD2
DDC Serial Data
Serial data for DDC. (0V to 5V) .
111
In
VREF2
Reference Voltage 2
Used to generate the threshold level for SDD, SDC, SPD and
SPC port. This pin should be tied externally to the maximum
voltage seen by the ports. (1.5V to 3.3V).
115,117 In/Out
DC1,DC2
DDC Serial Clock
Clock for DDC. (0V to 5V)
123-126
56,57
In/Out
GPIO[5:0
]
General Purpose Input / Output [5:0]
These pins provide general purpose I/O and are controlled via
the serial port. (3.3V).
127 Out
ENAVDD
Panel Power Enable
Enable panel VDD. (3.3V)
128 Out
ENABLK
Back Light Enable
Enable Back-Light of LCD Panel. (3.3V)
121 In
HPD
Hot Plug Detect
(Internal Pull-down)
This input pin determines whether a CRT monitor is connected
to the VGA connector. When terminated, the monitor is
required to apply a voltage greater than 2.4 volts. Changes on
the status of this pin will be relayed to the graphics controller
via the HPINT* pin pulling low.
122 Out
HPINT*
Hot Plug Interrupt Output
This pin provides an open drain output, which pulls low when a
termination change has been detected on the HPD input.
36 In
VSWING
LVDS Voltage Swing Control
This pin sets the swing level of the LVDS outputs. A 2.4K Ohm
resistor should be connected between this pin and LGND ( pin
35) using short and wide traces.
58 In
RESET*
Reset * Input
(Internal Pull-up)
When this pin is low, the device is held in the power on reset
condition. When this pin is high, reset is controlled through the
serial port.
