參數(shù)資料
型號(hào)： SAA7201
廠商： NXP Semiconductors N.V.
英文描述： Integrated MPEG2 AVG Decoder(綜合MPEG音頻視頻圖表譯碼器)
中文描述： 集成MPEG2解碼器的AVG（綜合的MPEG音頻視頻圖表譯碼器）
文件頁數(shù)： 20/36頁
文件大?。?/td> 292K
代理商： SAA7201
1997 Jan 29
20
Philips Semiconductors
Objective specification
Integrated MPEG2 AVG decoder
SAA7201
JTAG
The SAA7201 supports the standard Boundary Scan test
instructions: bypass, extest, sample, intest, runbist,
idcode.
Memory requirements
As indicated before the MPEG source decoder operates
with 16 Mbit of external memory. Several processes
require access to the external memory, mostly being the
video decoding process. In normal main level, main profile
video applications about 1.2 Mbit of memory space is free
for non-video processes. In practice most of this capacity
will be used for graphics. In combination with the internal
variable length decoding, full screen graphics at 8-bit per
pixel is feasible. Moreover, by having introduced a flexible
memory allocation procedure the available memory
capacity for graphics may be enlarged when decoding
lower resolution MPEG pictures or when the input bit rate
is less than 15 Mbit/s.
Obviously for graphics-only applications all 16 Mbit can be
used for the storage of bit-maps and look-up tables.
In Table 1 an overview is given of the required memory
capacity for some user defined modes.
In 50 Hz systems memory capacity can be saved by
restricting the chroma vertical interpolation to field
interpolation. This mode would only bring some extra
chroma resolution in case the input stream contains
progressive coded pictures.
In 60 Hz systems the reduction of storage capacity for
B-frames to field capacity has not only consequences for
the chroma vertical interpolation but also for the
3 : 2 pull-down operation mode. The operation
repeat-first-field is not possible in all cases and a modified
3 : 2 pull-down is performed under the control of the
SAA7201. The user may decide to use this modified
3 : 2 pull-down mode in order to have more memory
available for OSD or graphics.
Table 1
Required memory capacity for some user defined modes
System
50 Hz
60 Hz
Bit rate (R)
15 Mbit/s
15 Mbit/s
9 Mbit/s
Chroma interpolation
frame
field
field
frame
field
field
3 : 2 pull-down
n.a.
n.a.
n.a.
full MPEG
modified
modified
Picture format
720
×
576
64 kbit
1835 kbit
600 kbit
300 kbit
13456 kbit
16255 kbit
522 kbit
720
×
576
64 kbit
1835 kbit
600 kbit
300 kbit
12719 kbit
15518 kbit
1259 kbit
544
×
576
64 kbit
1835 kbit
400 kbit
200 kbit
9609 kbit
12108 kbit
4669 kbit
720
×
480
64 kbit
1835 kbit
500 kbit
250 kbit
12441 kbit
15090 kbit
1687 kbit
720
×
480
64 kbit
1835 kbit
500 kbit
250 kbit
10634 kbit
13292 kbit
3485 kbit
720
×
480
64 kbit
1835 kbit
300 kbit
150 kbit
8042 kbit
10391 kbit
6386 kbit
Audio input buffer
Video input buffer
Video implementation buffer (R/P)
Slave synchronization buffer (R/2P)
Reference and decoded picture
Total for video + audio
Remains for OSDG (2
24
= 16777 kbit)
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參數(shù)描述
SAA7201H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Integrated MPEG2 AVG decoder
SAA7205 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG-2 systems demultiplexer
SAA7205H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG-2 systems demultiplexer
SAA7206 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB compliant descrambler
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