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參數(shù)資料
| 型號(hào)： | ZR36067 |
| 廠商： | Zoran Corporation |
| 英文描述： | PCI Adapter Intended for Multimedia Applications on PCI Systems(PCI（外圍部件互連）適配器（用于PCI系統(tǒng)的多媒體）) |
| 中文描述： | PCI適配器預(yù)定在PCI系統(tǒng)的多媒體應(yīng)用（個(gè)PCI（外圍部件互連）適配器（用于的PCI系統(tǒng)的多媒體）） |
| 文件頁數(shù)： | 20/48頁 |
| 文件大?。?/td> | 580K |
| 代理商： | ZR36067 |
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AV PCI CONTROLLER
In the 24-bit packed format the first active pixel in a line is always
packed as indicated in the “First” row of Table 8. From then on
the byte organization is as described by the table.
8.0 GRAPHICS OVERLAY
The ZR36067’s Video DMA Controller is capable of masking off
(i.e., not transmitting) pixels that are marked by ‘0’ in a masking
map prepared and maintained by the driver software. The
masking feature, referred to as overlay or clipping, is turned on
by setting the OvlEnable parameter to ‘1’. As long as OvlEna-
ble=’0’, all pixels within the selected portion of the image are
transferred to destination. The masking map is a one bit deep
map of the video rectangle. Its location in system memory is
defined by a pair of base addresses (one for each field - Mask-
TopBase, MaskBotBase), and an inter-line stride (MaskStride).
The width of the map must be doubleword aligned. Thus, the line
size is:
int((VidWinWid+31) >> 5)
and the number of lines in the map is:
2*VidWinHt, if DispMod==0, or VidWinHt, if DispMod==1.
In order to match the 0/1 values of the map to their correspond-
ing pixels in the video rectangle, the map must follow the format
given in Table 9.
9.0 JPEG CODE TRANSFER
The data flow direction depends on the JPEG mode of opera-
tion. In Motion Video and Still Image Compression, the code is
transferred from the CODE bus to the system memory. In Motion
Video and Still Image Decompression, the code is transferred
from the system memory to the CODE bus.
The compressed data in system memory is structured within
code buffers. Each code buffer may contain a compressed field
or frame (two fields) as specified by a user-configurable bit.
The ZR36067 supports four code buffers, defined dynamically in
a dedicated table, the Code Buffer Table, in the system memory.
Before starting a new JPEG process, the host must load the
physical address of the code buffer table into the
I_STAT_COM_PTR register of the ZR36067.
The actual memory allocated to each code buffer by the operat-
ing system may be fragmented. The content of each entry in the
code buffer table is a pointer to a secondary Fragment Table.
The fragment table contains the pointers to the allocated
memory chunks.
Figure 9 provides a graphical description of the data structure in
the system memory.
9.1 The Code Buffer Table
The Code Buffer Table consists of four STAT_COM (“status or
command”) entries, one for each code buffer. The interpretation
of each STAT_COM entry is determined by its l.s. bit, the
STAT_BIT. If STAT_BIT=’0’, the content of the entry is the “com-
Table 7: 24-bit Unpacked Pixel Format
Endian-ness
Bits
31...24
23...16
15...8
7...0
Little Endian
0x0
R7...0
G7...0
B7...0
Gib Endian
B7...0
G7...0
R7...0
0x0
Table 8: 24-bit Packed Pixel Format
Bus Cycle
Bits
31...24
23...16
15...8
7...0
First
B17...0
R07...0
G07...0
B07...0
Second
G27...0
B27...0
R17...0
G17...0
Third
R37...0
G37...0
B37...0
R27...0
Table 9: Bit, Byte and Doubleword Organization of
the Masking Map
DWORD
...1
0
Byte
...0
3
2
1
0
Bit
7....0
31...24
23...16
15... 8
7...0
Pixel index in line
39...32
31...24
23...16
15...8
7...0
Figure 9. JPEG Code Data Structure In System Memory
I_STAT_COM_PTR
ADDRESS_0
LENGTH_0
ADDRESS_1
LENGTH_1
Fragment Table
ADDRESS_n-1
LENGTH_n-1
F
F
F
F=Final
Code Buffer Table
STAT_COM0
STAT_COM1
STAT_COM2
STAT_COM3
Fragment_0
Fragment_1
Fragment_n-1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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