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 1-4
Top-Level Overview
Document
7405-1HDM00-R
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VERVIEW
The BCM7405 is a next-generation high-definition satellite, cable, and IP set-top box solution offering integrated AVC
(H.264/MPEG-4 Part 10), MPEG-4 Part 2, MPEG-2, and VC-1 video decoding technology. It also supports DivX, H.263, and
XviD formats. The BCM7405 combines a data transport processor, high-definition video decoder, advanced-audio decoder,
2D graphics processing, high-quality video scaling and motion adaptive de-interlacing, six video DACs, stereo high-fidelity
audio DACs, a MIPS 4380 class processor with FPU, and a peripheral control unit providing a variety of set-top box control
functions.
The Data Transport Processor is an MPEG-2 DVB-compliant transport stream message/PES parser and demultiplexer. It is
capable of simultaneously processing 255 PIDs via 128 PID channels in up to six independent external transport stream
inputs and five internal playback channels. The data transport supports decryption for up to 128 PID channels in all streams.
All 128 PID channels can be used by the Record, Audio, and Video interface engine (RAVE), PCR processors, message
filter as well as for output via the high-speed transport or remux module. The data transport module RAVE supports 24
channels. Each RAVE channel can be configured as either a record channel for PVR functionality or as an AV channel to
interface to audio and video decoders. The transport provides 1DES/3DES/DVB/Multi2/AES descrambling support.
A
memory-to-memory DMA security module may be programmed for supporting AES/1DES/3DES/CSS/CPRM/CPPM/DTCP
copy protection algorithms/standards.
The BCM7405 features an enhanced Broadcom Secure Processor providing secure boot key generation, management, and
protection.
An advanced video decoder is featured in the BCM7405, capable of supporting high-definition AVC, VC-1, and ATSC
MPEG-2 streams. AVC support is up to High Profile Level 4.1. New tools in the AVC Fidelity Range extensions are
supported, including 8x8 transform and spatial prediction modes, and adaptive quantization matrix. The video decoder also
supports high-definition VC-1 (Advanced Profile Level 3, Main, and Simple Profiles) and ATSC compliant MPEG-2, Main
Profile at Main and High Levels. The BCM7405 has an advanced programmable audio processor capable of decoding a
broad range of formats including Dolby Digital, Dolby Digital Plus, AAC 5.1, AAC+ Level 2, AAC+ Level 4, WMA, and MPEG
1 Layer 1, 2, and 3 with simultaneous pass-through support. 3D SRS Audio is also supported. The audio processor also
supports advanced transcoding to DTS as an example. Available audio outputs are an SPDIF and one pair of analog outputs.
High-quality video and graphics processing are integrated into the chip, featuring advanced studio quality 2D graphics
processing while still maintaining efficient use of memory bandwidth. Also included are motion adaptive de-interlacing with
3:2 pull-down, and Letterbox Detection. Digital Noise Reduction support is also included; this reduces mosquito noise and
MPEG artifacts, including block noise. Digital contour removal is also supported for low bit rate AVC streams.
The BCM7405 has a dual-stream analog video encoder with Macrovision™ that supports the following output standards:
NTSC-M, NTSC-J, PAL-BDGHIN, PAL-M, PAL-Nc, and SECAM. The following output formats are supported: composite, S-
video, SCART1, SCART2, RGB and YPrPb component. The following output resolutions are supported: 480i, 480p, 576i,
576p, 720p, and 1080i. Six output DACs are available to be shared amongst the output functions. The BCM7405 also
supports output over an HDMI interface and a Channel 3/4 RF Modulator. An ITU-R-656 output port with Teletext sideband
is available if an interface to an additional external video encoder is desired. A high-definition digital video output port is also
available.
The BCM7405 incorporates a complete R4000 family FPU-based microprocessor subsystem, including caches with bridging
to memory and a local bus. NAND and NOR flash is supported. Integrated peripherals include three UARTS, two ISO7816
smart card interfaces, counter/timers, GPIO, LED/keypad controller, IR receivers, IR blaster, UHF remote control receiver,
an integrated soft modem system side device, and BSC and SPI controllers. Advanced connectivity features include two
USB 2.0/1.1 ports, an additional independent USB 2.0/1.1 port, a serial ATA port, an Ethernet port with MAC with an
integrated PHY and a dedicated Media Independent Interface (MII).
