tm1300 NXP Semiconductors, tm1300 Datasheet - Page 110

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

TM1300 Data Book
Table 7-2. SAV and EAV codes
avoided in the video data output by the EVO to prevent
accidental generation of an invalid sync code. The EVO
provides programmable maximum and minimum value
clipping on the video data to prevent this possibility. If
clipping is enabled, the EVO automatically clips the re-
sulting image data as described in
7.8.5
The interlaced frame timing defined by CCIR 656 is
shown in
for 525-line, 60-Hz systems and from 1 to 625 for 625-
line, 50-Hz systems. The Field and Vertical Blanking col-
umns indicate whether the field and vertical blanking bits,
respectively, are set in the SAV and EAV codes for the
indicated lines. The 525 and 625 formats have similar
timing but differ in their line numbering.
Table 7-3. CCIR 656 frame timing
7-6
264–265
266–282
283–525
20–263
Code
525/60
SAV
EAV
SAV
EAV
SAV
EAV
SAV
EAV
4–19
1–3
Line Number
Table
CCIR 656 Frame Timing
Binary Value
624–625
311–312
313–335
336–623
23–310
625/50
1000 0000
1001 1101
1010 1011
1011 0110
1100 0111
1101 1010
1110 1100
1111 0001
1–22
7-3. Lines are numbered from 1 to 525
F bit
1
0
0
0
1
1
PRODUCT SPECIFICATION
Field
V bit
1
1
1
1
2
2
2
2
1
1
0
1
1
0
Section
Vertical blanking for
Field 1, SAV/EAV
code still indicates
Field 2
Vertical blanking for
Field 1, change
SAV/EAV code to
Field 1
Active video, Field 1
Vertical blanking for
Field 2, SAV/EAV
code still indicates
Field 1
Vertical blanking for
Field 2, change
SAV/EAV code to
Field 2
Active video, Field 2
Vertical Blanking
Comments
7.15.3.
X
X
X
X
7.9
The EVO generates timing for frames, active video areas
within frames, images within the active video area, and
overlays within the image area. The relationship between
these four is shown in
the timing for both interlaced fields. Progressive scan, or
non-interlaced video, is accomplished by setting the tim-
ing parameters such that two identical successive fields
are generated.
7.9.1
Shown in
the horizontal and vertical blanking intervals and repre-
sents the pixels visible on the screen. The image area is
the actual displayed image within the active video area.
It can be slightly smaller than the active video area to
avoid edge effects at the top, bottom and sides of the im-
age. The overlay area is within the image area.
The EVO uses counters to generate and control image
timing. The Frame Line Counter and Frame Pixel
Counter control the overall timing for the frame and de-
fine the total number of pixels per line, lines per frame,
and interlace timing, including horizontal and vertical
blanking intervals.
Note that the Frame Line Counter has a starting value of
one, not zero, and it counts from 1 to 525 or 625, consis-
tent with CCIR 656 line numbering. The Image Line
Figure 7-13. Active Video Area and Image Area in re-
lation to vertical and horizontal blanking intervals.
ENHANCED VIDEO OUT TIMING
GENERATION
Figure
Active Video Area
Start Pixel
7-13, the active video area begins after
Image Width
Vertical Blanking, Field 2
Vertical Blanking, Field 1
Image Area, Field 2
Image Area, Field 1
Figure
Frame
Active Video Area
Active Video Area
Image V Offset
Image V Offset
Philips Semiconductors
Overlay
Overlay
7-13. The frame includes
Start
Line