Broadcom BCM7405 - Analog Video Encoder; Digital Video Decoder (ITU-R-656); Table 1-6: Digital Video Decoder Supported Modes; Table 1-7: VBI Decoding

2/24/2008 9T6WP
BCM7405 Preliminary Hardware Data Module
Functional Description 06/29/07
Broadcom Corporation
Page 1-50 Video and Graphics Display Document 7405-1HDM00-R
DIGITAL VIDEO DECODER (ITU-R-656)
The BCM7405 contains an ITU-R-656 digital video decoder. The decoder supports the modes outlined in Table 1-6. For all
formats, the incoming data is 4:2:2 format with two luminance samples combined with one chrominance sample for each of
the red and blue color spaces.
VBI Decoding
ANALOG VIDEO ENCODER
The BCM7405 employs a analog video encoder (VEC) with Macrovision 7.1 support capable of processing one high
definition video stream and one standard definition (that is scaled down content from the high definition video stream).
Instead of replicating identical modules, the VEC is built out of distinct block elements to meet the preferred customer
requirements. Therefore, the VEC is a single module that takes a series of video inputs from multiple sources, inserts fly
backs (hblank and vblank), formats the signal into multiple valid output video standards, and additionally handles the
insertion of non-video signals into the VBI region. The VEC supports a variety of analog video standards (NTSC, NTSC-J,
PAL (all variations including PAL-M/Nc), SECAM, as well as a variety of output formats: composite, S-Video, SCART1,
SCART2, component (480i, 480p, 576i, 576p, 720p, 1080i, 1080p24, and 1080p30). The VEC uses a fixed clock
architecture.
Table 1-6: Digital Video Decoder Supported Modes
Clock (MHz) Standard Resolution Notes
27 ITU-R-656 525i, 625i SD resolution; 525i and 625i
27 ### 240p 4:2:2 digital format
Table 1-7: VBI Decoding
VBI Input Source Standard Mnemonic Direct Decode
Sample and
Store to Memory
Ancillary Data
Packets
Analog Video (525i
NTSC) composite
input only
IEC 61880-1 BVID Yes Yes –
EIA-608 Closed Caption Yes Yes –
ETS 300 294 WSS Yes Yes –
– NABTS Yes Yes –
Analog Video (625i
PAL) composite input
only
IEC 61880-1 BVID Yes Yes –
EIA-608 Closed Caption Yes Yes –
ETS 300 294 WSS Yes Yes –
– Teletext Yes Yes –