- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄359352 > VCT3801A (MICRONAS SEMICONDUCTOR HOLDING AG) Video/Controller/Teletext IC Family PDF資料下載
參數(shù)資料
| 型號(hào)： | VCT3801A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | Video/Controller/Teletext IC Family |
| 中文描述： | 視頻/控制/圖文電視IC系列 |
| 文件頁(yè)數(shù)： | 57/172頁(yè) |
| 文件大?。?/td> | 2243K |
| 代理商： | VCT3801A |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)當(dāng)前第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)
ADVANCE INFORMATION
VCT 38xxA
Micronas
57
3.8. Character Generator
Characters are addressed using a 10-bit character
code. The 2 MSBs of the character code define 1 of 4
character sets. Character set selection is done using
level 2 parallel attributes (see Table 3–7 on page 56).
Each character set contains 224 characters. The first
32 characters in each character set are reserved for
control codes (see Table 3–6 on page 56). On a single
screen, 896 different characters can be displayed.
Characters can be displayed in several pixel resolu-
tions provided that the according font is available. The
character generator supports horizontal resolution of
8 or 10 pixel/char and vertical resolution of 8, 10, or
13 lines/char. Characters can be combined without
separating borders to create more complex character
definitions (e.g. kanji or icons).
The pixel clock can be either 10.125 MHz or
20.25 MHz. To get 10-bit pixel information from the
character font, two memory cycles are needed. The
character font is part of the mask-programmable ROM,
but supplied with its own bus structure (see Fig. 3–2 on
page 49). By this means the data transfer between
character ROM and teletext display controller does not
stop the CPU.
Both bus structures are connected via a memory inter-
face which allows cross-connections using DMA or
wait cycles. If the character font size exceeds
12 kBytes, part of the character font can be shifted into
the program ROM which causes DMA cycles. There-
fore only less frequently used characters should be
placed into the program ROM. Vice versa seldom used
CPU code can be put into the character ROM.
The WST specification defines a number of 7-bit code
tables, which are filled with 96 characters only (the
MSB is used for parity check). In the G0 code table
some characters have several language dependent
variations. Additionally characters from the G0 code
table can be combined with diacritical marks from the
G2 code table (row 26). Furthermore different code
tables are defined for languages like cyrillic, greek or
arabic. Thus it is not possible to simply transform the
code tables into a continuous character font ROM with-
out getting unused ROM space and multiple defined
character fonts.
This problem is solved by implementing a character
code mapping (see Fig. 3–11 on page 58). The
5 MSBs of each character code are mapped into
another 5-bit code which is then used to address the
character font ROM. By this means the whole charac-
ter font is subdivided into 32 blocks of 32 characters
which can freely be distributed over the 4 character
sets.
The character code mapping is implemented as RAM
and can be programmed by software. After reset the
TPU initializes the mapping RAM for standard WST
latin code tables.
The TV controller can select predefined mappings for
latin, cyrillic and arabic teletext via the command
DISPLAY_MODE (see Table 3–16 on page 70). The
same command allows selection of a user defined
mapping which has to programmed in advance using
command USER_MAPPING.
Table 3–9:
Character resolutions
matrix
(h x v)
char/sc
reen
(PAL)
char/sc
reen
(NTSC)
osd
width
# char in
12k font
# char in
20k font
single character
8 x 8
40 x 32
40 x 28
32
μ
s
1600
2560
10 x 8
40 x 32
40 x 28
40
μ
s
1280
2048
8 x 10
40 x 26
40 x 22
32
μ
s
1280
2048
10 x 10
40 x 26
40 x 22
40
μ
s
1024
1638
8 x 13
40 x 20
40 x 17
32
μ
s
800
1280
10 x 13
40 x 20
40 x 17
40
μ
s
640
1024
combined character (2 x 2)
16 x 16
20 x 16
20 x 14
32
μ
s
400
640
20 x 16
20 x 16
20 x 14
40
μ
s
320
512
16 x 20
20 x 13
20 x 11
32
μ
s
320
512
20 x 20
20 x 13
20 x 11
40
μ
s
256
409
16 x 26
20 x 10
20 x 8.5
32
μ
s
200
320
20 x 26
20 x 10
20 x 8.5
40
μ
s
160
256
combined character (2 x 1)
16 x 10
20 x 26
20 x 22
32
μ
s
640
1024
16 x 13
20 x 20
20 x 17
32
μ
s
400
640
20 x 13
20 x 20
20 x 17
40
μ
s
320
512
combined character (1x 2)
10 x 16
40 x 16
40 x 14
40
μ
s
640
1024
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VCU2133 | High-Speed coder/decoder IC |
| VCX2150A | Surface mount 15.88 mm SQ (.625 SQ) |
| VCX2154A | Surface mount 15.88 mm SQ (.625 SQ) |
| VCXO-105N | VCXO |
| VCXO-199 | VCXO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VCT3802A | 制造商:MICRONAS 制造商全稱(chēng):MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3803A | 制造商:MICRONAS 制造商全稱(chēng):MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3804A | 制造商:MICRONAS 制造商全稱(chēng):MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3811A | 制造商:MICRONAS 制造商全稱(chēng):MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3831A | 制造商:MICRONAS 制造商全稱(chēng):MICRONAS 功能描述:Video/Controller/Teletext IC Family |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。