5-39
Electrical Information
Table 5-32 summarizes the timing specifications for the 1024 x 768 and 1280 x 1024 moni-
tors at VESA 75 Hz standard.
In the past, Hewlett-Packard workstation timing was set with sync-on-green. The VESA
standard provides separate TTL syncs, thereby providing an unambiguous way for the moni-
tor to distinguish them.
Table 5-32
Timing Specifications for VESA 75 HZ Standard
Signal
D2806A
1024x768
75 Hz VESA
A4330A/A4331
1280x1024
75 Hz VESA
Horizontal active scan
13.003
µ
s
9.481
µ
s
Horizontal “back porch”
2,235
µ
s
1.837
µ
s
Horizontal blanking
3.367
µ
s
3.022
µ
s
Horizontal “front porch”
0.203
µ
s
0.119
µ
s
Horizontal period (“1H”)
16.660
µ
s
12.504
µ
s
Horizontal sweep frequency
60.023KHz
79.976KHz
Horizontal sync width
1.219
µ
s
1.067
µ
s
Pixel clock rate
78.750 MHz
135.000Mhz
Vertical active period
12.795ms
12.804ms
Vertical “back porch”
466.48
µ
s
475.15
µ
s
Vertical blanking
0.533ms
0.525ms
Vertical frame rate
75.029Hz (non-in)
75.025Hz (non-in)
Vertical “front porch”
16.66
µ
s (1H)
13.000
µ
s (1H)
Vertical period
13.328ms
13.329ms
Vertical sync width
49.98
µ
s (3H)
37.520
µ
s (3H)
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