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參數(shù)資料
| 型號(hào)： | SAA5249 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| 中文描述： | 綜合貴賓和圖文電視的背景內(nèi)存控制器IVT1.1BMCX |
| 文件頁(yè)數(shù)： | 22/44頁(yè) |
| 文件大小： | 821K |
| 代理商： | SAA5249 |
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1996 Nov 07
22
Philips Semiconductors
Preliminary specification
Integrated VIP and Teletext with
Background Memory Controller
SAA5249
IVT1.1BMCX page memory organization
The organization of the page memory is illustrated by Fig.11. The IVT1.1BMCX provides an additional row as compared
with first generation decoders; this brings the display format up to 40 characters by 25 rows. Rows 0 to 23 form the
teletext page; Row 24 is the extra row available for software generated status messages and FLOF/FASTEXT prompt
information.
Fig.11 Basic page memory organization.
MBA274
7 characters
for status
8 characters
always rolling
(time)
fixed character
written by IVT hardware
alphanumerics white for normal
alphanumerics green when looking
for display page
7
1
8
24
24 characters from page header
rolling when display page looked for
5
to
20
0
1
2
3
4
ROW
21
22
23
24
25
MAIN PAGE DISPLAY AREA
PACKET X / 22
PACKET X / 23
PACKET X / 24 STORED HERE IF R0D7 = 1
14
10
10 bytes for
received
page information
14 bytes
free for use
by microcontroller
Fig.12 Organization of the extension memory.
MBA275 - 2
PACKET X / 24 if R0D7 = 0
PACKET X / 27 / 0
PACKETS 8 / 30 / 0 to 15
1
0
2
ROW
R
EMARK TO
Fig.11
Row 0
Row 0 is for the page header. The first seven columns
(0 to 6) are free for status messages. The eighth is an
alphanumeric white or green control character, written
automatically by IVT1.1BMCX to give a green rolling
header when a page is being looked for. The last eight
characters are for rolling time.
Row 25
The first 10 bytes of row 25 contain control data relating to
the received page as shown in Table 5. The remaining
14-bytes are free for use by the microcomputer.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA5249P | Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| SAA5250 | Interface for data acquisition and control for multi-standard teletext systems |
| SAA5250P | Interface for data acquisition and control for multi-standard teletext systems |
| SAA5250T | Interface for data acquisition and control for multi-standard teletext systems |
| SAA5252 | Line twenty-one acquisition and display LITOD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA5249GP | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| SAA5249GP/E | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| SAA5249P | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| SAA5249P/E | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Integrated VIP and Teletext with Background Memory Controller IVT1.1BMCX |
| SAA5250 | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Interface for data acquisition and control for multi-standard teletext systems |
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