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PDF TW6865 Data sheet ( Hoja de datos )
| Número de pieza | TW6865 | |
| Descripción | 4-in-1 Video Decoders | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TW6865 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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4-in-1 Video Decoders with PCI Express Media
Bridge
TW6865
The TW6865 is a highly integrated solution that
supports multi-channel video and audio capture via
PCIe x1 interface for PC DVR system and video
analytic application. It contains high quality four-
channel NTSC/PAL/SECAM video decoders that
convert analog composite video signal to digital
component YCbCr data, and utilize adaptive 4H
comb filter for separating luminance and
chrominance to reduce cross noise artifacts.
TW6865 contains a high performance proprietary
DMA controller that fully optimizes the utilization of
PCIe x1 bandwidth and enables it to transfer video
and audio data at a high throughput rate that
closely approaches the theoretical limit of PCIex1
interface. TW6865 is able to simultaneously decode
and transfer 4 real time D1 video, or up to 16
channel non-real time D1, plus 8 channel audio.
TW6865 decreases the complexity and workload of
client-side software development, and significantly
reduces the strains on PC hardware and resources.
TW6865 also includes a software development kit
(SDK) with Windows and Linux compliant drivers
and reference application software.
Features
Video Decoders
Accepts all NTSC(M/N/4.43) /
PAL(B/D/G/H/I/K/L/M/N/60) standards with
auto detection
Integrated eight video analog anti-alias filters and
10-bit CMOS ADCs
IF compensation filter for improvement of color
demodulation
Color Transient Improvement (CTI)
White peak AGC control
Programmable hue, saturation, contrast,
brightness and sharpness
High quality proprietary fast video locking system
for non-real-time application
High performance adaptive 4H comb filters for all
NTSC and PAL standards
Audio Codecs
Integrated eight audio ADCs
8/16 bit audio word length
Sample audio with 8/16/32/44.1/48kHz
DMA Controller
Highly-efficient DMA design can support up to 4
real time D1 video and 8 real time audio channels,
or up to 16 non-real- time video with optimization
of full PCIex1 bandwidth
Multiple video format output support: UYVY/Y422,
YUYV/YUY2, IYU1/Y411, Y41P, YUV420, RGB555
and RGB565
Integrated internal video and audio generator
simplifies system test and development
Built-in motion detection engine for each video
channel
Hardware-friendly design enables smooth data
transfer and virtually eliminates unwanted big-
block data jamming among PC devices, resulting
in optimized PC internal bandwidth consumption
PCIe Configurations
PCI Express Base Specification 1.1 Compliant
Flexible PCIe packet size configuration: 128 byte,
256 byte and 512 byte options
Applications
PC-based DVR system
Video analytic system
FN8304.0
April 20, 2012
1
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
TW6865
Pin Configuration
144 TQFP Pin Diagram (Top -> Bottom View)
VIN2D
VIN2C
VIN2B
VIN2A
VDDV2
VDDV3
VIN3A
VIN3B
VIN3C
VIN3D
VSSV3
VSSV4
VIN4D
VIN4C
VIN4B
VIN4A
VDDV4
VSS12
VDD12
VDDV8
NC
NC
NC
NC
VSSV8
VSSV7
NC
NC
NC
NC
VDDV7
VDDV6
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
TW6865
TQFP-144L
20x20
108 GP27
107 GP26
106 GP25
105 GP24
104 GP23
103 GP22
102 GP21
101 GP20
100 VDD33
99 VSS33
98 VP
97 VPH
96 REFCLK_M
95 REFCLK_P
94 GD
93 REXT
92 GD
91 RX_M
90 RX_P
89 GD
88 TX_P
87 TX_M
86 VPH
85 VP
84 PERST_N
83 VSS33
82 VDD33
81 GP19
80 GP18
79 GP17
78 GP16
77 GP15
76 GP14
75 GP13
74 VDD12
73 VSS12
5
5 Page 
TW6865
AUTOMATIC GAIN CONTROL AND CLAMPING
All four analog channels have built-in clamping circuits that restore the signal DC level. The Y channel
restores the back porch of the digitized video to a level of 60. This operation is automatic through internal
feedback loop. The Automatic Gain Control (AGC) of the Y channel adjusts input gain so that the sync tip is at
a desired level. Programmable white peak protection logic is included to prevent saturation in the case of
abnormal signal proportion between sync and white peak level.
SYNC PROCESSING
The sync processor of TW6865 detects horizontal synchronization and vertical synchronization signals in the
composite video or in the Y signal of an S-video or component signal. The processor contains a digital phase-
locked-loop and decision logic to achieve reliable sync detection in stable signal as well as in unstable
signals, such as those from VCR fast forward or backward.
The vertical sync separator detects the vertical synchronization pattern in the input video signals. In addition,
the actual sync determination is controlled by a detection window to provide more reliable synchronization.
An option is available to provide faster responses for certain applications. The field status is determined at
vertical synchronization time. The field logic can also be controlled to toggle automatically while tracking the
input.
Y/C SEPARATION
The color-decoding block contains the luma/chroma separation for the composite video signal and multi-
standard color demodulation. For NTSC and PAL standard signals, the luma/chroma separation can be done
either by comb filter or notch/band-pass filter combination. For SECAM standard signals, adaptive
notch/band-pass filter is used. The default selection for NTSC/PAL is comb filter.
In the case of comb filter, the TW6865 separates luma (Y) and chroma (C) of a NTSC/PAL composite video
signal using a proprietary 4H adaptive comb filter. The filter uses a four-line buffer. Adaptive logic combines
the upper-comb and the lower-comb results based on the signal changes among the previous, current and
next lines. This technique leads to excellent Y/C separation with small cross luma and cross color at both
horizontal and vertical edges
Due to the line buffer used in the comb filter, there are always two lines processing delay at the output
except for the component input mode, which has only one line delay.
If notch/band-pass filter is selected, the characteristics of the filters are shown in the filter curve section.
Figure 3 shows the frequency response of the notch filter for each system NTSC and PAL. Figure 4 shows the
frequency response of Chroma Band Pass Filter Curves.
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TW6865.PDF ] | |
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