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參數(shù)資料
| 型號(hào)： | TVP3026-220 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Video Interface PALETTE Exract(組合像素模式視頻接口調(diào)色器) |
| 中文描述： | 視頻接口調(diào)色板Exract（組合像素模式視頻接口調(diào)色器） |
| 文件頁數(shù)： | 52/107頁 |
| 文件大?。?/td> | 707K |
| 代理商： | TVP3026-220 |
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2–38
the 24 different DAC data inputs. The 16-bit remainder that is calculated on the individual DAC data line can
be read from the CRC remainder LSB and CRC remainder MSB registers. See subsection 2.15.9, CRC
Remainder LSB and MSB Registers and subsection 2.15.10, CRC Bit-Select Register for the CRC register
bit definitions.
As long as the display pattern for each screen remains fixed, the CRC result should remain constant. When
the CRC result changes, an error condition should be assumed. The CRC is calculated using the algorithm
depicted by the circuit in Figure 2–11. The user can calculate and store the CRC remainder for a test screen
in software and compare this to the TVP3026 calculated CRC remainder to verify data integrity.
LSB
D Q
15
D Q
14
D Q
13
DQ
12
DQ
11
DQ
10
DQ
9
DQ
8
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
D Q
2
D Q
1
DQ
0
DATAIN
Q0
MSB
Figure 2–11. CRC Algorithm
2.11.2
Sense Comparator Output and Test Register
The TVP3026 provides a SENSE output to support system diagnostics. SENSE can determine the
presence of the CRT monitor or verify that the RGB termination is correct. SENSE is reset to 0 when 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. When the internal voltage
reference is used, the tolerance is higher.
The sense comparators are also integrated with the sense test register (index: 0x3A) 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 of Table 2-24.
Table 2–24. Sense Test Register Results
INDEX: 0x3A, ACCESS: R/W, DEFAULT: UNINITIALIZED
STR BITS
D7
D6
D5
D4
D3
D2
D1
D0
Data
DIS
0
0
0
0
R
G
B
where: R = set to 1 if IOR > 350 mV
G = set to 1 if IOG > 350 mV
B = set to 1 if IOB > 350 mV
D6 – D3 are reserved
D7 is disable (set to 1) bit
NOTE
D7 can be set to 1 to disable the sense comparison function. At reset, the sense
comparison is enabled (D7 = 0). D6–D3 are reserved. When this register is written
to, to disable the sense comparator function, bits D6–D0 need to be reset 0.
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 bit MCR6).
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.
Identification Code
An ID register with a hardwired code is provided that can be used as a software identification of the device
for different versions of the system design. The ID register is read only through index 0x3F. The value defined
for the TVP3026 is 0x26.
2.11.3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TVP3026-220AMDN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3026-220APCE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3026-220BMDN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3026-220BPCE | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TVP3026-220MDN | 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) |
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