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PDF ( 数据手册 , 数据表 ) TW6865

零件编号 TW6865
描述 4-in-1 Video Decoders
制造商 Intersil
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TW6865 数据手册, 描述, 功能
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.







TW6865 pdf, 数据表
TW6865
Functional Description
Video Decoder
VIDEO INPUT FORMATS
The TW6865 has built-in automatic standard discrimination circuitry. The circuit uses burst-phase, burst-
frequency and frame rate to identify NTSC, PAL or SECAM color signals. The standards that can be identified
are NTSC (M), NTSC (4.43), PAL (B, D, G, H, I), PAL (M), PAL (N), PAL (60) and SECAM (M). Each standard can
be included or excluded in the standard recognition process by software control. The exceptions are the base
standard NTSC and PAL, which are always enabled. The identified standard is indicated by the Standard
Selection (SDT) register. Automatic standard detection can be overridden by software controlled standard
selection.
TW6865 supports all common video formats as shown in Table 1.
FORMAT
TABLE 1. VIDEO INPUT FORMATS SUPPORTED BY THE TW6865
LINES
FIELDS
FSC
COUNTRY
NTSC-M
NTSC-Japan (Note 0)
PAL-B, G, N
PAL-D
PAL-H
PAL-I
PAL-M
PAL-CN
SECAM
525
525
625
625
625
625
525
625
625
PAL-60
525
NTSC (4.43)
525
NOTE:
NTSC-Japan has 0 IRE setup.
60 3.579545MHz
60 3.579545MHz
50 4.433619MHz
50 4.433619MHz
50 4.433619MHz
50 4.433619MHz
60 3.575612MHz
50 3.582056MHz
50 4.406MHz 4.250MHz
60 4.433619MHz
60 4.433619MHz
U.S., many others
Japan
Many
China
Belgium
Great Britain, others
Brazil
Argentina
France, Eastern Europe, Middle
East, Russia
China
Transcoding
8







TW6865 equivalent, schematic
TW6865
register, the 12-bit HSCALE register, which is the concatenation of two 8-bit registers SCALE_HI and
HSCALE_LO, is used to reduce the output pixels to the desired number.
Following is an example using pixel ratio to determine the horizontal scaling ratio. These equations should be
used to determine the scaling ratio to be written into the 12-bit HSCALE register assuming HACTIVE is
programmed with 720 active pixels per line:
NTSC:
HSCALE = [720/Npixel_desired] * 256
PAL:
HSCALE = [(720/Npixel_desired)] * 256
Where: Npixel_desired is the nominal number of pixel per line.
For example, to output a CCIR601 compatible NTSC stream at SIF resolution, the HSCALE value can be found
as:
HSCALE = [(720/320)] * 256 = 576 = 0x0240
However, to output a SQ compatible NTSC stream at SIF resolution, the HSCALE value should be found as:
HSCALE = [(640/320)] * 256 = 512 = 0x200
In this case, with total resolution of 768 per line, the HACTIVE should have a value of 640.
The vertical scaling determines the number of vertical lines output by the TW6865. The vertical scaling
register (VSCALE) is a 12-bit register, which is the concatenation of a 4-bit register SCALE_HI and an 8-bit
register VSCALE_LO. The maximum scaling ratio is 16:1. The following equations should be used to
determine the scaling ratio to be written into the 12-bit VSCALE register assuming VACTIVE is programmed
with 240 or 288 active lines per field.
60Hz system: VSCALE = [240/ Nline_desired] * 256
50Hz system: VSCALE = [288/ Nline_desired] * 256
Where: Nline_desired is the number of active lines output per field.
The scaling ratios for some popular formats are listed in Table 2. Figure 8 shows the Horizontal Scaler Pre-
Filter Curve.
SCALING
RATIO
1:1
2:1 (CIF)
4:1 (QCIF)
TABLE 2. HSCALE AND VSCALE VALUE FOR SOME POPULAR VIDEO FORMATS.
FORMAT
TOTAL
OUTPUT
RESOLUTION RESOLUTION
HSCALE
VALUES
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
780x525
858x525
944x625
864x625
390x262
429x262
472x312
432x312
195x131
214x131
236x156
216x156
640x480
720x480
768x576
720x576
320x240
360x240
384x288
360x288
160x120
180x120
192x144
180x144
0x0100
0x0100
0x0100
0x0100
0x0200
0x0200
0x0200
0x0200
0x0400
0x0400
0x0400
0x0400
VSCALE
(FRAME)
0x0100
0x0100
0x0100
0x0100
0x0200
0x0200
0x0200
0x0200
0x0400
0x0400
0x0400
0x0400
16










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