參數(shù)資料
型號： ZR36060
廠商： Electronic Theatre Controls, Inc.
元件分類： 圓形連接器
英文描述： Circular Connector; No. of Contacts:19; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:14-19
中文描述： 綜合JPEG編解碼器
文件頁數(shù)： 35/46頁
文件大小： 307K
代理商： ZR36060
33
Integrated JPEG CODEC
SUBIMG Window Registers
Address: 0x04A - 0x051
Parameters used to define the ‘sub-image window’ rectangle of the video. Master/
Slave modes do not affect these parameters.
Horizontal measures are in number of VCLKs (1 VCLK = 1 pixel, regardless of the
video bus width), from the leading edge of HSYNC.
Vertical measures are in number of HSYNCs (1 HSYNC = 1 line), from the leading
or trailing edge of VSYNC according to the FIVedge parameter.
SVstart[15:0]:
Length from VSYNC edge to first subimage line measured in
number of lines. Writing N indicates that the first subimage line is line N+1. (e.g. -
SVstart = 11, to have the first subimage line on line number 12).
SVend[15:0]:
Length from VSYNC edge to last subimage line measured in
number of lines. Writing N indicates that the last line is line N. (e.g. - SVend = 241,
to have the last line on line number 241).
Maximum permitted value for (SVend - SVstart) is 32768.
SHstart[9:0]:
Length from HSYNC leading edge to first subimage pixel measured
in number of pixels. Writing N indicates that the first subimage pixel is pixel number
N+1. (e.g. - SHstart = 99, to have the first subimage pixel on VCLK number 100).
SHend[9:0]:
Length from HSYNC leading edge to last subimage pixel measured
in number of pixels. Writing N indicates that the last subimage pixel is pixel number
N. (e.g. - SHend = 720, to have the last subimage pixel on VCLK number 720).
Maximum permitted value for (SHend - SHstart) is 1024.
8.4 JPEG Marker Segments
The following table shows the mapping of all JPEG markers in
the ZR36060 internal memory. The Value column contains
common values (hexadecimal) used when compressing/decom-
pressing YUV 4:2:2 format images. There are no default values
since all the markers are contained inside the internal RAM,
therefore the user must pre-load the correct values before oper-
ating the ZR36060.
In compression the marker segments data appears in the com-
pressed image bitstream. Inclusion of optional marker segments
is controlled by the Markers Enable register.
In decompression, the marker segments contained in the com-
pressed bitstream are automatically written by the ZR36060 into
the appropriate internal memory locations. At the end of a com-
pression, the host can read them if so desired.
The marker segments in the Internal Memory have exactly the
same syntax as the marker segments specified in the JPEG
standard. These segments are: SOF, SOS, DRI, DQT, DHT,
APP, and COM. The SOI, EOI and RST markers are supported
automatically by the ZR36060.
Before starting to compress a sequence of images, the host
must program the appropriate marker segments in the internal
memory, and issue a Load command to load them. Only the
markers actually used need to be programmed: the required
markers SOF and SOS, and whichever optional markers are
specified in the Markers Enable register. Note that the starting
location of each marker segment in the internal memory is fixed,
but the length and the content of each marker segment may
vary.
The host does not have to program any of the marker segments
in order to decompress an image bitstream that contains all the
necessary tables. If the bitstream is in the abbreviated format
and lacks one or more tables, the host must program the appro-
priate tables in the internal memory, and issue a Load command
before starting to decompress a sequence of images that use the
same tables.
0x04A
0x04B
0x04C
0x04D
0x04E
0x04F
0x050
0x051
7
6
5
4
3
2
1
0
SVstart [15:8]
SVstart [7:0]
SVend [15:8]
SVend [7:0]
SHstart [9:8]
SHstart [7:0]
SHend [9:8]
SHend [7:0]
R/W
X
default
type
Table 4: ZR36060 JPEG Markers
Address
Content
Value
Description
060
SOF0
FF
Start Of Frame marker (FFC0). This
segment contains 17 bytes that
define the 3 Y,U,V components of
the MCU. Is used both in compres-
sion and decompression.
061
SOF0
C0
062
LEN_H
00
Length of this segment (without the
marker)
063
LEN_L
11
064
P
8
Precision (8 bits)
065
Y_H
Number of lines in the active area
(must always equal Vend - Vstart)
066
Y_L
067
X_H
Number of pixels in the active area
(must always equal Hend - Hstart)
068
X_L
069
Nf
3
Number of Color Components (YUV
= 3 components)
06A
CY
0
ID for the Y Component
06B
HY,VY
21
Number of appearances of Y in
MCU, horizontally and vertically
06C
TqY
0
Quantization table ID for Y
06D
CU
1
ID for the U Component
06E
HU,VU
11
Number of appearances of U in
MCU, horizontally and vertically
06F
TqU
1
Quantization table ID for U
070
CV
2
ID for the V Component
071
HV,VV
11
Number of appearances of V in
MCU, horizontally and vertically
072
TqV
1
Quantization table ID for V
...
...
Unused
07A
SOS
FF
Start Of Scan marker (SOS).
Contains the Huffman table IDs to
use with each Y,U,V component in
the MCU.
07B
SOS
DA
07C
LEN_H
00
Length of this segment (without the
marker)
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