74ACT715 Ver la hoja de datos (PDF) - Fairchild Semiconductor
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74ACT715 Datasheet PDF : 14 Pages
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RS170 Default Register Values
The tables below show the values programmed for the
RS170 Format (using a 14.31818 MHz clock signal) and
how they compare against the actual EIA RS170 Specifica-
tions. The default signals that will be output are CSYNC,
CBLANK, HDRIVE and VDRIVE. The device initially starts
at the beginning of the odd field of interlace. All signals
have active low pulses and the clock is disabled at power
up. Registers 13 and 14 are not involved in the actual sig-
nal information. If the Vertical Interrupt was selected so that
a pulse indicating the active lines would be output.
Reg D Value H
Register Description
REG0 0 000 Status Register (715)
REG0 1024 400 Status Register (715-R)
REG1 23 017 HFP End Time
REG2 91 05B HSYNC Pulse End Time
REG3 157 09D HBLANK Pulse End Time
REG4 910 38E Total Horizontal Clocks
REG5 7 007 VFP End Time
REG6 13 00D VSYNC Pulse End Time
REG7 41 029 VBLANK Pulse End Time
REG8 525 20D Total Vertical Lines
REG9 57 039 Equalization Pulse End Time
REG10 410 19A Serration Pulse Start Time
REG11 1 001 Pulse Interval Start Time
REG12 19 013 Pulse Interval End Time
REG13 41 029 Vertical Interrupt Activate Time
REG14 526 20E Vertical Interrupt Deactivate Time
REG15 911 38F Horizontal Drive Start Time
REG16 92 05C Horizontal Drive End Time
REG17 1 001 Vertical Drive Start Time
REG18 21 015 Vertical Drive End Time
Input Clock
Line Rate
Field Rate
Frame Rate
Rate
14.31818 MHz
15.73426 kHz
59.94 Hz
29.97 Hz
Period
69.841 ns
63.556 µs
16.683 ms
33.367 ms
RS170 Horizontal Data
Signal
Width
HFP
HSYNC Width
22 Clocks
68 Clocks
HBLANK Width
156 Clocks
HDRIVE Width
HEQP Width
91 Clocks
34 Clocks
HSERR Width
68 Clocks
HPER iod
910 Clocks
RS170 Vertical Data
VFP
3 Lines
VSYNC Width
3 Lines
VBLANK Width
VDRIVE Width
20 Lines
11.0 Lines
VEQP Intrvl
VPERiod (field)
9 Lines
262.5 Lines
VPERiod (frame)
525 Lines
µs
1.536
4.749
10.895
6.356
2.375
4.749
63.556
190.67
190.67
1271.12
699.12
16.683 ms
33.367 ms
%H
7.47
17.15
10.00
3.74
7.47
100
7.62
4.20
3.63
Specification (µs)
1.5 ±0.1
4.7 ±0.1
10.9 ±0.2
0.1H ±0.005H
2.3 ±0.1
4.7 ±0.1
6 EQP Pulses
6 Serration Pulses
0.075V ± 0.005V
0.04V ± 0.006V
9 Lines/Field
16.683 ms/Field
33.367 ms/Frame
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