Vibrant VM77S, Service Manual

Page: 9 / 34

Product Specifications
Page 7
VM77S
2-3 Timing Chart
This section describes the timings that the computer industry recognizes as standard for computer-generated
video signals.
Table 2-2. Timing Chart
H.Parameters:
A: Period B: Blanking Time
C: Sync Width D: Back Porch
E: Active Time F: Front Porch
V.Parameters:
G: Period H: Blanking Time
I: Sync Width J: Back Porch
K: Active Time L: Front Porch
M o d e 1 2 3 4 5 6 7 8
H. Dots 640 640 640 800 800 1024 1280 1024
V. Dots 480 480 480 600 600 768 1024 768
H-freq (kHz) 31.47 37.5 43.3 46.8 53.67 60.02 63.98 68.68
Sync Polarity - - - + + + + +
A period us 31.78 26.666 23.111 21.333 18.63 16.66 15.63 14.56
B Blanking us 6.356 6.35 5.33 5.172 4.409 3.657 3.778 3.725
C Sync us 3.81 2.03 1.556 1.616 1.138 1.219 1.037 1.016
D B.P. us 1.907 3.81 2.222 3.232 2.702 2.235 2.296 2.201
E Active us 25.42 20.32 17.778 16.162 14.22 13 11.852 10.836
F F.P. us 0.636 0.51 1.556 0.323 0.569 0.203 0.444 0.508
V-freq (Hz) 59.95 75 85 75 85 75.03 60 85
Sync Polarity - - -
+
+ + + +
O Period ms 16.68 13.33 11.764 13.333 11.76 13.33 16.661 11.77
P Blanking ms 1.43 0.533 0.67 0.533 0.578 0.533 0.656 0.582
Q Sync ms 0.064 0.08 0.069 0.064 0.056 0.05 0.047 0.044
R B.P. us 1.02 0.427 0.578 0.448 0.503 0.466 0.594 0.524
S Active us 15.25 12.8 11.093 12.8 11.18 12.8 16.005 11.18
T F.P. us 0.35 0.026 0.023 0.021 0.019 0.017 0.016 0.015
Seperate Sync
Horizontal
Video
C
D
E
Sync
A
B
F
Vertical
Video
I
J
Sync
G
H
L
K