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6 . 7
Notes on DMA Mode
1. Dummy memory read before DMA transfer
A dummy UGM read should be performed immediately before setting DMA transfer to the
UGM (DMA bits = 01).
2. Register access during DMA transfer
To read a Q2 register during DMA transfer to the UGM (DMA bits = 01), it is necessary to set
YUV = 01 for the YUV mode, then set DMA = 01 for the DMA mode, and start DMA transfer.
(Since the DMA bits are not set to 11, YUV conversion is not performed.)
As YUV = 01 is set for the YUV mode, the registers shown in the table below must not be
accessed
A [ 1 0 : 1 ]
Register Abbreviation
Register Name
007
IEMR
Input data conversion mode
010
DMASHR
DMA transfer start address
011
DMASLR
DMA transfer start address
012
DMAWR
DMA transfer word count
021
ISAHR
Image data transfer start address
022
ISALR
Image data transfer start address
023
IDSXR
Image data size
024
IDSYR
Image data size
025
IDER
Image data entry
026–0FF
—
Reserved
On completion of the DMA transfer, set YUV = 00 for the YUV mode and restore the Q2 to
normal mode.
Содержание HD64411 Q2
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Страница 108: ...101 Example 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 110: ...103 Example Old XC YC Old XC XC old YC YC 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 112: ...105 Example 0 0 Work coordinates Rendering coordinates XO1 YO1 XO1 DX2 YO1 DY2 XO1 DX1 YO1 DY1 LINE ...
Страница 116: ...109 Example 0 0 Work coordinates Rendering coordinates XMIN YMIN XMAX YMAX ...
Страница 118: ...111 Example 0 0 Work coordinates Rendering coordinates XMAX YMAX ...
Страница 120: ...113 Example 0 0 Work coordinates XMIN YMIN XMAX YMAX ...
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Страница 213: ...206 Figure 7 20 TV Sync Mode Display Timing When DOT 0 or DOT 1 and EXHSYNC cycle is even multiple of CLK1 cycle ...