DS_S1D2502A01 Datasheet, PDF (26/57 Pages) Samsung semiconductor – VIDEO AMP MERGED OSD PROCESSOR FOR MONITORS

Preliminary
VIDEO AMP MERGED OSD PROCESSOR FOR MONITORS
S1D2502A01
Registers
Frame Control
Registers — 0
(Row 15,
Column 00)
Table 11. Register Description (Continued)
Bits
BliT
(Bit 0)
Bli1, Bli0
(Bit 2 — 1)
Description
Blink time control
If this bit is '1', blink time is 0.5sec, and if not, 1sec.
Blinking duty control
As the font blinks, there is a time when it is visible and invisible on screen.
Blinking duty is the ratio of the invisible time to the visible time, and is
decided by the combination of these two bits. In other words, blinking duty
is the length of time the font is shown on screen.
Bli1
Bli0
0
0
0
1
1
0
1
1
Blinking Duty
Blink Off
Duty 25%
Duty 50%
Duty 75%
ScrT
(Bit 3)
Scrl
(Bit 4)
EN
(Bit 5)
Erase
(Bit 6)
Scroll time control
If this bit is '1', scroll time is 0.5sec, and if not, 1sec.
Scroll enable
Scrolling effect is controlled by this bit. If this bit is ‘1’, scrolling effect is
enabled. You must remember that scrolling can be turned on/off only when
OSD is enabled/disabled.
OSD enable
OSD is enabled when this bit is '1'. In other words, if this bit isn't '1'OSD is
not output inspite of writing control data. We recommend that you enable
the OSD after setting the control registers (such as the character & attribute
register) because of video and OSD output timing.
RAM erasing
If this bit is '1', the RAM data (character & attribute registers and row
attribute registers) is erased. The time spent in carrying out this operation is
called erasing time, which can be calculated as follows.
Erasing time = RAM clock × 480 (RAM cell no.)
RAM clock = 12 dot clock
Dot clock = 1/(dot frequency)
Dot frequency = Horizontal frequency × resolution (mode)
Therefore, the maximum erasing time value is:
(Erasing Time)_MAX = (12 × 480) / (15k × 320) = 1.2ms
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