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參數(shù)資料
型號: TPU3040PQ
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
元件分類: 圖文
英文描述: TELETEXT DECODER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 46/72頁
文件大小: 576K
代理商: TPU3040PQ
PRELIMINARY DATA SHEET
TPU 3035, TPU 3040, TPU 3050
MICRONAS INTERMETALL
50
4.13. Ghost Row Organization
Page-related ghost rows are stored in blocks of 128
byte. 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. 4–10: Ghost Row Organization
page 100
ghost block
Page Table
page pointer
ghost
pointer
ghost
pointer
ghost block
0000
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.
Table 4–22: 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
Fig. 4–11: Ghost Block Structure
40 byte row 1 data
40 byte row 2 data
40 byte row 3 data
8 byte block header
ghost row pointer
row 1
row 2
row 3
4-bit designation code
3-bit row number
‘a(chǎn)a’
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