Broadcom BCM7405 - Digital Video Encoder; Safe Mode; Video Dacs

2/24/2008 9T6WP
Preliminary Hardware Data Module BCM7405
06/29/07 Functional Description
Broadcom Corporation
Document 7405-1HDM00-R Video and Graphics Display Page 1-53
VIDEO DACS
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.
DIGITAL VIDEO ENCODER
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 20/21SCTE––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