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SDA525X-2 データシート(PDF) 15 Page - Siemens Semiconductor Group

部品番号 SDA525X-2
部品情報  ICs for Consumer Electronics
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ホームページ  http://www.siemens.com/
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SDA525X-2 データシート(HTML) 15 Page - Siemens Semiconductor Group

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SDA 525X-2
Semiconductor Group
15
1998-10-08
of external XDATA-memory will be possible, controlled by A16, A17, A18. This offers a
maximum of flexibility for 128-page-acquisition (see separate application note).
6.6
No UART
As described already in the errata sheet 03/97, release 1.0, the newer versions of the
SDA 525x and the SDA 525x-2 will not support a serial port (UART) any more.
6.7
VS Sampling
The internal sampling time of the vertical sync pulse coming from either the VS pin or
from the sandcastle signal applied at the pin HS/SC is most important for a stable
display. Because the VSYNC inside a TV set is often delayed by external components,
the real relation-chip of the VS-phase and the appropriate picture frame may get lost.
The sampling time of the SDA 525x is derived from an internal display signal which can
only be modified by programming different horizontal offset values (DHD-Register). This
has the side-effect that depending on the desired horizontal offset the sampling point is
also varied and may show an unstable display. To avoid this dependency, the
SDA 525x-2 has a separate register to determine the VS sampling point with respect to
the HS pulse, which may be varied over a whole line in steps of 8
µs. External
components for VS delaying are no more necessary and can be removed if the
programmed VS sampling points fits to the external timing between HS, VS and the
actual frame (even/odd). To get a better timing resolution in 100 Hz-applications a
special bit has been implemented to reduce the intervals between the possible sampling
points from 8 to 4
µs. The register bits are described below. The following diagram shows
the internal VS processing in principle.
Figure 6
Internal VS Processing
HS
VS
Sample Point
Sampled VS
Field
Internal VS
UED11012


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