參數(shù)資料
型號(hào): TVP3030-220
廠商: Texas Instruments, Inc.
英文描述: Video Interface PALETTE Exract(1600×1200,24位真彩色視頻接口調(diào)色器)
中文描述: 視頻接口調(diào)色板Exract(1600 × 1200,24位真彩色視頻接口調(diào)色器)
文件頁數(shù): 56/107頁
文件大?。?/td> 689K
代理商: TVP3030-220
2–40
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Overscan Border
OVS
Blank
Display Area
Figure 2–10. Overscan Border
2.12 Horizontal Zooming
The TVP3030 supports a user-programmable horizontal zooming function of 2, 4, 8, 16, or 32
×
.
Zooming
is controlled through the CKC5–CKC7 bits of the color-key control register (index: 0x38, see Section 2.16.7
for the color-key control register definition).
When one of the horizontal zoom factors (besides 1
×
) is chosen, the internal pixel multiplexer is configured
such that it replicates the pixel data on successive dot clocks by the number of times specified by
CKC5–CKC7. Also the RCLK frequency must be modified by changing the loop clock PLL registers to load
pixel data at the new reduced rate. The new RCLK frequency should be chosen as the old RCLK frequency
divided by the zoom factor.
The horizontal zoom function applies only to the pixel port (P127–P0) data. VGA data cannot be zoomed.
The maximum zoom factor for all packed-24 modes is 8
×
.
When zooming in 5:4 packed-24 mode, the latch
control register setting depends on the zoom factor as described in Section 2.16.6.
2.13 Test Functions
The TVP3030 provides several functions that enable system testing and verification. These are detailed in
Sections 2.13.1 through 2.13.4.
2.13.1
A 16-bit cyclic redundancy check (CRC) is provided so that video data integrity can be verified at the input
to the DACs. The CRC is updated when two consecutive horizontal sync (HSYNC) pulses are detected while
BLANK is active (vertical retrace). For the use of the CRC function, HSYNC must be active low at the input
to the TVP3030. The CRC is only calculated on the active screen area, i.e., active blank stops the
calculation. One complete vertical screen must be completed to generate a valid CRC.
16-Bit CRC
The CRC can be performed on any of the 24 data lines that enter the DACs and is controlled by the CRC
bit select register (index: 0x3E). Values from 0 to 23 (0x17) may be written to this register to select between
相關(guān)PDF資料
PDF描述
TVP3030-250 Video Interface PALETTE Exract(1600×1200,24位真彩色視頻接口調(diào)色器)
TVP3409-170 Advanced Video Interface PALETTE(雙PLL,視頻接口調(diào)色器真彩色CMOS)
TVP3409-135 Advanced Video Interface PALETTE(雙PLL,視頻接口調(diào)色器真彩色CMOS)
TVP3703-170 Video Interface PALETTE Exract(雙PLL,先進(jìn)的視頻接口調(diào)色器)
TVP3703-135 Video Interface PALETTE Exract(雙PLL,先進(jìn)的視頻接口調(diào)色器)
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