bcm94704nr Broadcom Corp., bcm94704nr Datasheet - Page 2

• Manufacturer Part Number: bcm94704nr
• Description: Bcm4703 - Intensi-fi 802.11n Low-cost 10/100 Processor
• Manufacturer: Broadcom Corp.

The Broadcom
processors are high-performance, low-power System On a Chip (SoC)
devices designed to support all IEEE wireless networking standards.
These devices offer features such as simultaneous dual-band operation,
an expandable platform, and fast time-to-market that differentiate end
products. Rich in integrated hardware and software features, the
BCM4704/BCM4703’s designs are optimized for use in
IEEE 802.11a/g access points and routers.
The BCM4704/BCM4703 integrate an advanced custom 400-DMIPS/
300-MHz MIPS32 core with the following:
• 2-way, set associative, 16-KB I-cache and 16-KB D-cache
• Two 10/100 Ethernet MACs
• V.92 codec interface
In addition to all MIPSII instructions, the MIPS core includes extra
instructions that optimize the DSP algorithms used for communications,
audio, and video applications. An integrated MMU, with a 32-entry
TLB, provides support of multithreaded operating systems such as the
standard distribution Linux. The V.92 data/fax/voice modem interfaces
to an external serial modem codec/DAA. It also has two 10/100 Ethernet
MACs that are ideal for residential gateways routing information
between the WAN port and one or more Ethernet LAN ports.
The BCM4704/BCM4703 provides simultaneous PCI 2.3 host interface,
expansion host interface, and USB 1.1 host/device interface operation
for adding application-specific peripherals including Broadcom's
Broadcom
the trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries
and/or the EU. Any other trademarks or trade names mentioned are the property of their respective
owners.
BROADCOM CORPORATION
5300 California Avenue
Irvine, California 92617
© 2007 by BROADCOM CORPORATION. All rights reserved.
4703_4704-PB00-R 12/13/07
®
, the pulse logo, Connecting everything
®
AirForce BCM4704/BCM4703 wireless networking
Connector
Connector
USB
USB
®
BCM4704
®
, and the Connecting everything logo are among
GPIO Port
GPIO Port
PCMCIA
Flash
IDE
Expansion
Expansion
USB Device
USB Device
Controller
Controller
Controller
USB Host
Two-Port
BCM4704 Block Diagram
Bus
Bus
O V E R V I E W
Codec
Codec
Audio/
Audio/
IR
IR
Mult/Acc
Mult/Acc
MIPS32
MIPS32
EJTAG
EJTAG
Core
Core
BCM4318 IEEE 802.11a/g dual-band, BCM4306 IEEE 802.11g,
BCM4321 and BCM4322 802.11n network interface controllers. The
PCI 2.3 host interface allows enumeration of three external PCI
peripherals (more with external arbiter) for platform expansion. The
expansion host interface allows expansion of up to four devices without
requiring the decoding of external addresses. The BCM4704 is capable
of hosting two USB 1.1-compliant devices (integrated 2-port hub),
allowing platform expansion by end users and can implement USB print
server functionality. In addition, the USB interface can be configured as
a USB device instead of a host to support applications where the
BCM4704/BCM4703-based system is added to existing legacy systems.
The BCM4703 wireless networking processor is a cost-optimized
version of the BCM4704 processor. The BCM4703 does not include the
2-port USB 1.1 host/device, and audio codec and v92 codec interfaces.
Unlike the BCM4704, the BCM4703 only supports an 8-bit expansion
bus and a PCI 2.3 host interface that supports two external PCI
peripherals.
As the highest performing members of the AirForce BCM47xx family of
products, the BCM4704/BCM4703 use the same basic software code as
the BCM4702 wireless host processor and the BCM4711 integrated
IEEE 802.11b wireless network processor chipsets. This compatibility
ensures that the manufacturing software investment scales across
Broadcom's complete line of low-cost, high-performance wireless access
points and routers.
Interrupt Ctrl.
Interrupt Ctrl.
Internal Bus
Internal Bus
Bus I/F
Bus I/F
Timer
Timer
MMU
MMU
Controller
Controller
D-Cache
I-Cache
(16 KB)
(16 KB)
Cache
Cache
10/100
10/100
MAC
MAC
LAN
10/100
10/100
MAC
MAC
PLL
PLL
WAN
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com
48 MHz
48-MHz
Crystal
Crystal