1-16
X7SPA-L/X7SPA-H/X7SPA-HF
User’s Manual
1-8 LVDS (X7SPA-L only)
Low-Voltage Differential Signaling (LVDS) is an industry-standard electrical signal-
ing system. This signaling system can run at very high speeds over inexpensive
copper wires using low power.
The LVDS bus on the X7SPA-L motherboard is used to transport video data from
the built-in graphics adapter to a computer monitor, such as a user-supplied external
LCD display. This motherboard's 18-bpp LVDS connector (6 bits/color) is located
on J5 and the inverter connector for the LCD/back light control is located on J6. It
is possible for certain types of 24-bpp LCD panels (8 bits/color) to be connected to
the 18-bpp interface. Please refer to the following illustration:
Differential Clock
Pair A
Differential Data
Pair A0
Differential Data
Pair A1
Differential Data
Pair A2
18-bpp Connector
Differential Clock
Pair B
Differential Data
Pair B0
Differential Data
Pair B1
Differential Data
Pair B2
Differential Clock
Pair A
Differential Data
Pair A0
Differential Data
Pair A1
Differential Data
Pair A2
Differential Clock
Pair B
Differential Data
Pair B0
Differential Data
Pair B1
Differential Data
Pair B2
Differential Data
Pair A3
Differential Data
Pair B3
24-bpp LVDS Panel
Note:
The full 24-bpp range will not be available on the 24-bpp LVDS panel because
the Differential Data Pair A3/B3 is not being driven by the 18-bpp connector. The
LVDS panel will in effect operate as an 18-bpp device. For an in-depth explanation
on this particular subject, go to www.intel.com and search for document 315975.
pdf.
