SAA5281 Datasheet, PDF(24/48 Page) NXP Semiconductors – Integrated Video input processor and Teletext decoder IVT1.8

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SAA5281 Datasheet, PDF (24/48 Pages) NXP Semiconductors – Integrated Video input processor and Teletext decoder IVT1.8

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Philips Semiconductors

Integrated Video input processor and

Teletext decoder (IVT1.8*)

Preliminary speciï¬cation

SAA5281

FUNCTION

R13 ADVANCED CONTROL 2B - does not auto-increment

AUTO DISPLAY PKT X/24

DISABLE PKT X/26

HAM CHECK 24 : 18

POINTS ENABLE

Status row will show the contents of the row of the extension memory (packet 24)

when logic 1.

Output taken from processing engine written to the display memory when logic 0.

Operates independent of the acquisition.

When logic 1 all packet 26 data is stored in extension memory unchecked.

Enable for acquisition pointers when logic 1.

VPS ENABLE

MESHING ENABLE

CURSOR FREEZE/

DEVICE IDENT

ENHANC MODE

VPS acquisition enabled when logic 1.

Enables meshing display function in box mode.

When logic 1, cursor position not updated even if active row and column change.

This bit will also cause R3 and R4 of the ROM code in Register R11B to be set

HIGH. This allows software to identify the device as an IVT1.8*. An internal â1.8

modeâ ï¬ag is also set, which enables the operation of R0D4, R4D4 and the subtitle

bit in R3.

When logic 1, extension packet data is mapped into the last chapter. Only packet

24, 27/0 and 8/30 are stored. Chapters 0 to 6 can then be used for page storage. If

extension packets are not enabled, 8 pages are stored as normal, but X/26 engine

is enabled.

Note

1. These functions have IN and OUT referring to inside and outside the boxing function respectively.

Table 9 ODD/EVEN selection

AUTO

ODD/EVEN

DISABLE

ODD/EVEN

RESULT

ODD/EVEN output continuous

ODD/EVEN statically LOW

ODD/EVEN active only when no TV picture displayed

DV output to indicate reception of error-free 8/30/format 2 packet or VPS line

Table 10 Interlace/non-interlace 312/313 line control and ODD/EVEN ï¬eld detection option

TCS ON

FFB MODE(1)

RESULT

0 interlaced 312.5/312.5 lines

1 non-interlaced 312/313 lines (note 2)

0 non-interlaced 312/313 lines (note 2)

1 SCS (scan composite sync) mode: FFB leading edge in ï¬rst broad pulse of ï¬eld

1 SCS (scan composite sync) mode: FFB leading edge in second broad pulse of ï¬eld

Notes

1. X = don't care.

2. Reverts to interlaced mode if a newsflash or subtitle is being displayed.

1996 Nov 04

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