參數(shù)資料
型號(hào)： TVP3025-175
廠商： Texas Instruments, Inc.
英文描述： Video Interface PALETTE(三PLL，視頻接口調(diào)色器)
中文描述： 視頻接口盒（三鎖相環(huán)，視頻接口調(diào)色器）
文件頁數(shù)： 50/99頁
文件大小： 663K
代理商： TVP3025-175
2–36
2.3.13
The TVP3025 provides several functions that enable system testing and verification. These are detailed in
Sections 2.3.13.1 through 2.3.13.3.
Test Functions
2.3.13.1 16-Bit CRC
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 on the second horizontal sync (either SYSHS or VGAHS) rising edge
during vertical retrace and is only calculated on the active screen area; i.e., active blank stops the
calculation. The CRC can be performed on any of the 24 data lines that enter the DACs and is controlled
by the CRC-control register (CRCC bits 0–4). Values from 0 to 23 may be written to this register to select
between the 24 different DAC data inputs. Value 0 corresponds to DAC data red 0 (LSB), value 7 to red 7
(MSB), value 8 to green 0 (LSB), value 15 to green 7 (MSB), value 16 to blue 0 (LSB), and value 23 to blue
7 (MSB). The 16-bit remainder that is calculated on the individual DAC data line can be read from the CRC
LSB and CRC MSB registers. See Table 2–3 for the indirect register map address. See Sections 2.3.18.15
and 2.3.18.16 for the CRC register bit definitions.
As long as the display pattern for each screen remains fixed, the CRC result should remain constant. If the
CRC result changes, an error condition should be assumed. Since the CRC is calculated using the common
CRC–16 polynomial (X
16
+ X
15
+ X
2
+ 1), the user can calculate and store the CRC remainder for a test
screen in software and compare this to the TVP3025-calculated CRC remainder to verify data integrity.
2.3.13.2 Sense Comparator Output and Test Register
The TVP3025 provides a SENSE output to support system diagnostics. SENSE can be used to determine
the presence of the CRT monitor or verify that the RGB termination is correct. SENSE is a logic 0 if one or
more of the DAC outputs exceeds the internal comparator voltage of 350 mV. The internal 350-mV reference
has a tolerance of
±
50 mV when using an external 1.235-V reference. If the internal voltage reference is
used, the tolerance is higher.
The sense comparators are also integrated with the sense test register [index 3A (hex)] so that the
comparison results for the red, green, and blue comparators can be read independently through the 8-bit
microinterface. When the sense test register (STR) is read, the results are indicated in the bit positions as
shown below.
STR BITS
D7
D6
D5
D4
D3
D2
D1
D0
Data
0
0
0
0
0
R
G
B
where:
R = logic 1 if IOR > 350 mV
G = logic 1 if IOG > 350 mV
B = logic 1 if IOB > 350 mV
D6 – D3 are reserved
D7 is disable (logic 1) bit
NOTES: A. D7 can be set to a logic 1 to disable the sense comparison function. At reset, the sense comparison is
enabled (D7 = logic 0). D6–D3 are reserved. If the sense test register is written to disable the sense
comparator function, bits D6–D0 need to be set to a logic 0.
B. Both the SENSE output and the sense test register are latched by the falling edge of the internally sampled
blank signal (SYSBL or VGABL depending on the mode). In order to have stable voltage inputs to the
comparators, the frame-buffer inputs should be set such that data entering the DACs remains unchanged
for a sufficient period of time prior to and after the blank-signal falling edge.
相關(guān)PDF資料
PDF描述
TVP3030-175 Video Interface PALETTE Exract(1600×1200，24位真彩色視頻接口調(diào)色器)
TVP3030-220 Video Interface PALETTE Exract(1600×1200，24位真彩色視頻接口調(diào)色器)
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)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TVP3025-175PCE 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
TVP3025-220MDN 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
TVP3025-220PCE 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
TVP3026 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
TVP3026-135AMDN 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette
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