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
文件頁數(shù)： 52/172頁
文件大?。?/td> 2243K
代理商： VCT3801A
VCT 38xxA
ADVANCE INFORMATION
52
Micronas
3.5.4. Ghost Row Organization
Page-related ghost rows are stored in blocks of
128 Bytes. These ghost blocks are linked together
using 2-Byte ghost row pointers. The first pointer can
be found in the basic page, all following pointers are
part of the block header. A zero pointer indicates the
end of the chain.
Fig. 3–6:
Ghost row organization
Every ghost block contains 3 ghost rows which can be
identified by 3 row identification bytes in the block
header. The row identification contains designation
code and row number. The row number is reduced to a
3-bit tag. All ghost rows in one block belong to the
same page. If the memory manager removes a page
from memory, the linked ghost blocks will also be
removed.
Fig. 3–7:
Ghost block structure
3.5.5. Subpage Manager
Any page in cycle can have a number of subpages,
identified by subcode. In normal mode the subpage
manager will acquire only one subpage of every
requested page. This subpage can be any if subcode
FFFF is requested or it will be selected according to
the requested subcode.
After a
PAGE_REQUEST
command with subcode
F0xx, the subpage manager will acquire all subpages
of the requested page. The subpages will be chained
in the same order as they are transmitted, i.e. every
new subcode will be added at the end of chain. The
page table entry points to the subpage which was
transmitted first after the page request. The
READ_PAGE_INFO
command will reply the page
table pointer and the actual number of subpages in
chain.
After a
PAGE_REQUEST
command with subcode
F1xx, the subpage manager will acquire all subpages
of the requested page but will allocate only a limited
amount of memory to store these subpages. The
parameter “page subcode low” will define the length (in
number of subpages) of a ring buffer in page memory
which will hold the recently received subpages. In this
case, the
READ_PAGE_INFO
command will return an
index pointing to the most recently updated subpage in
chain, together with the subcode of this page.
ghost
pointer
Page Table
page 100
page pointer
ghost
pointer
ghost block
0000
ghost block
Table 3–3:
Ghost Row Identification
Row Number Tag
Row
000
empty
001
row 25
010
row 26
011
row 27
100
row 28
101
row 29
110
row 30
111
row 31
3-bit row number
4-bit designation code
‘a(chǎn)a’
‘a(chǎn)a’
‘a(chǎn)a’
row 2
row 1
row 3
ghost row pointer
40 Byte row 1 data
40 Byte row 2 data
40 Byte row 3 data
8 Byte block header
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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:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3803A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
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VCT3811A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3831A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
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