2/24/2008 9T6WP
BCM7405
Preliminary Hardware Data Module
Functional Description
06/29/07
Bro a d c o m C o rp o r a ti o n
Page 1-52
Video and Graphics Display
Document
7405-1HDM00-R
illustrates a single-channel implementation of the VEC. By replicating select modules, this architecture can be
expanded to meet any targeted requirement.
Figure 1-13: VEC Block Diagram
The following is a summary of the supported tasks:
•
Sync Generation
•
DC Level Offset
•
Color Space Conversion
•
Luminance and Chroma filtering
•
Macrovision encoding (Version 7.1.S1)
•
VBI Support including Close Caption, Teletext, NABTS, WSS, CGMS-A, Gemstar, SCTE20/21, and AMOL I/II
VBI Encoding
Table 1-9: VBI Encoding
Mnemonic
Standard
Output format
Resolution
Direct Encode
Retrieve from
Memory
(Sampled)
Graphics
BVID
IEC 61880-1
CVBS/YC
525i
Yes
Yes
Yes
IEC 61880-1
Component
525i
Yes
Yes
Yes
IEC 61880-2
CVBS/YC
525p
Yes
Yes
Yes
IEC 61880-2
Component
525p
Yes
Yes
Yes
CPR-1204-2
CVBS/YC
750p, 1125i
TBD
–
Yes
CPR-1204-2
Component
750p, 1125i
TBD
–
Yes
Closed caption
EIA-608
CVBS/YC
525i
Yes
Yes
Yes
EIA-608
Component
525i
Yes
Yes
Yes
WSS
ETS 300 294
Component
525i
Yes
Yes
Yes
ETS 300 294
CVBS/YC
525i
Yes
Yes
Yes
Inpu t
T im in g
Inpu t
T im in g
V ideo
Fo rm atter
V ide o
F orm atter
V id eo
F o rm a tte r
S R C
S ub -
C arrier
M odulator
D igita l V ide o
F orm atter
S R C
S ub -
C arrie r
M odu la tor
S R C
D V I
3
3
3
6
V ideo 1
V ideo 2
IT U
R 656