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74ACT715SC Arkusz danych(PDF) 11 Page - Fairchild Semiconductor

Numer części 74ACT715SC
Szczegółowy opis  Programmable Video Sync Generator
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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©1988 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74ACT715, 74ACT715-R Rev. 1.3
11
than 12 CLOCK pulses on the same register will only
cause the MSB to repeat on the output. Re-scanning the
same register will require that register to be reloaded.
The value of the two horizontal counters and 1 vertical
counter can also be scanned out by using address num-
bers 51–53. Note that before the part will scan out the
data, the LOAD signal must be brought back HIGH.
Normal device operation can be resumed by loading in a
non-scan address. As the scanning of the registers is a
non-destructive scan, the device will resume correct
operation from the point at which it was halted.
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 Specifi-
cations. 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 inter-
lace. All signals have active low pulses and the clock is
disabled at power up. Registers 13 and 14 are not
involved in the actual signal 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
Rate
Period
Input Clock
14.31818MHz
69.841ns
Line Rate
15.73426kHz
63.556µs
Field Rate
59.94Hz
16.683ms
Frame Rate
29.97Hz
33.367ms


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