AMD Geode™ LX Processors Data Book
399
Video Processor
33234H
6.7.6.3
HBLANK and VBLANK Signals
HBLANK and VBLANK signals are different from HSYNC
and VSYNC. The HSYNC and VSYNC signals are only
active for a portion of the blanking time, while the HBLANK
and VBLANK signals are active through the entire time.
HBLANK is a function of horizontal pixel position, while
VBLANK is a function of the vertical line number and the
horizontal pixel position. Figures 6-30 to 6-34 show the for-
mation of these signals using a 525-line NTSC video win-
dow.
Figure 6-30. 525-Line NTSC Video Window
Figure 6-31. HBLANK and VBLANK for Lines 20-262, 283-524
Pixel Position
Line Number
Frame 1
858
525
1
1
V = 1
V = 0
V = 1
V = 0
20
264
283
Frame 0 (continued)
Frame 0
Pixel Position
Line Number
HBLANK
VBLANK
720
721
858
001
L#
L# + 1
Summary of Contents for Geode LX 600
Page 14: ...14 AMD Geode LX Processors Data Book Overview 33234H...
Page 20: ...20 AMD Geode LX Processors Data Book Architecture Overview 33234H...
Page 44: ...44 AMD Geode LX Processors Data Book Signal Definitions 33234H...
Page 88: ...88 AMD Geode LX Processors Data Book GLIU Register Descriptions 33234H...
Page 618: ...618 AMD Geode LX Processors Data Book Electrical Specifications 33234H...