2/24/2008 9T6WP
Preliminary Hardware Data Module
BCM7405
06/29/07
Functional Description
Bro a d c o m Co rp o r a ti o n
Document
7405-1HDM00-R
Video and Graphics Display Page 1-53
V
IDEO
DAC
S
The BCM7405 integrates a set of six 10-bit video DACs, using Broadcom’s proven high-speed CMOS DAC technology.
These DACs are configured to support SCART1 as well as component, S-Video (Y/C), and composite video (CVBS) outputs.
D
IGITAL
V
IDEO
E
NCODER
The BCM7405 integrates the equivalent of the Broadcom BCM7501 DVI transmitter into itself. This transmitter allows for
multiple configuration options, each with High-bandwidth Digital Content Protection (HDCP), for secure and encrypted
connections. It is used as a single-link transmitter, providing full-rate 165 megapixels per second data. The transmitter
implements content protection of the DVI link as described by the HDCP System specification.
The BCM7405 transmitter content protection circuit contains the HDCP cipher engine, the encryption block, and related
control logic. The BCM7405 also implements the master control of HDCP authentication and revocation process.
Safe Mode
Safe mode is a required display mode for DVI 1.0 compliance when used for connecting a personal computer to a computer
monitor. This mode is not a standard ATSC display mode. Most DVI 1.0 enabled ATSC televisions may not support this
mode. Nevertheless, the BCM7405 has included the Safe mode of operation for the DVI outputs.
Internally, the BCM7405 generates a 25.2-MHz or 25.174-MHz clock to generate the correct clock signal for either the 60 or
59.94-Hz environments. The video is output at this rate through the DVI port in 640 x 480p resolution.
Teletext
–
Component
–
Yes
Yes
Yes
–
CVBS/YC
–
Yes
Yes
Yes
NABTS
–
Component
–
Yes
Yes
Yes
–
CVBS/YC
–
Yes
Yes
Yes
Macrovision
Rev 7.1
Component
525i
Yes
–
No
Rev 7.1
CVBS/YC
525i
Yes
–
No
Rev 1.03
Component
525p
Yes
–
No
Rev 1.03
CVBS/YC
525p
Yes
–
No
Rev 7.1
Component
625i
Yes
–
No
Rev 7.1
CVBS/YC
625i
Yes
–
No
GemStar
–
–
–
Yes
–
No
SCTE 20/21
SCTE
–
–
Yes
–
No
AMOL I/II
–
–
–
Yes
–
No
Table 1-9: VBI Encoding (Cont.)
Mnemonic
Standard
Output format
Resolution
Direct Encode
Retrieve from
Memory
(Sampled)
Graphics