.
Version 1.3 2005
NET2272
Features
Overview
o
8/16 bit local bus connects gluelessly
to most CPUs, DSPs, and DMA
controllers
o
Hi-Speed USB 2.0 Peripheral Port
o
Bursting DMA support facilitates
data transfers at 480 Mbps
o
High Bandwidth Isochronous Support
o
Low Power(186mW) requirements
ideal for USB Bus-Powered
Operation
o
Lowest standby power in its class
(8.1碌W)
o
Variable I/O voltage (1.8V to 5V)
o
Lead Free Packaging
o
10x10mm 64-Pin TQFP Package
o
6x6mm, 64-Ball BGA Package
Hi-Speed USB 2.0 Interface
o
USB 2.0 Peripheral Interface
o
Hi-Speed USB with Sustained
Bandwidth of up to 40MBytes/sec (at
480 Mbps bursts)
o
Backwards compatible to Full Speed
USB connections
o
Utilize up to 30 Independent USB
Endpoints using Dynamic Virtual
Endpoint Technology
TM
o
Support for Bulk, Isochronous, and
Interrupt Endpoints
o
Integrated PHY
Local Bus to USB 2.0 Hi-Speed Peripheral Controller
Optimized for Power and Performance
PLX Technology鈥檚 NET2272 Local Bus to Hi-Speed USB 2.0 Peripheral Controller
is designed for low power and high performance applications.
The NET2272鈥檚 low power requirements (186mW active, 8.1碌W standby) make it
ideal for bus-powered or battery-powered applications. USB bus-powered devices
are allowed to draw a maximum 500mA (according to the USB specification) of
operating current from the PC through the USB cable. The NET2272鈥檚 low power
makes this requirement easy to support. Furthermore, the NET2272鈥檚 variable I/O
voltage (1.8V to 5V) makes it easy to connect to other low power components.
The NET2272 features the highest sustained data transfer speeds on USB 鈥?up to
40Mbytes/sec. An optional Split Bus mode allows for simultaneous DMA and CPU
access to the NET2272. In this mode, the external DMA controller is connected to
upper 8-bits of the data bus, while the local CPU is connect to the lower 8-bits of the
data bus. While DMA transactions are taking place, the local CPU can
simultaneously access any endpoint buffer not involving the DMA.
The NET2272鈥檚 Dynamic Virtual Endpoint Technology鈩?actualizes the maximum
number of endpoints (30) allowed by the USB specification. This feature provides
the flexibility for applications to route different data through different endpoints to
improve quality of service and ease of design.
Add Hi-Speed USB 2.0 to Your Device
The NET2272 can be used to easily add a USB 2.0 peripheral port to any local bus
based embedded system. The local bus interface of the NET2272 can often connect
gluelessly because
its interface looks
like an 8 or 16-bit
SRAM. Most
CPUs and DSPs
already have these
memory interfaces
integrated.
The NET2272鈥檚
asynchronous bus
makes it frequency
independent.
Accessing the
NET2272鈥檚
registers is as
simple as accessing
memory.
Figure 1: NET2272 Block Diagram
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