Specification
NET2270 USB Interface Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 3.6, April 17, 2003
8
Serial Interface Engine (SIE):
•
Interface between Packet Buffers and USB transceiver.
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CRC generator and checker.
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Packet Identifier (PID) decoder.
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Forced Error Conditions
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USB 2.0 Test Modes
USB Protocol Controller
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Host to Device Communication.
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Automatic retry of failed packets.
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Up to 3 Isochronous, Bulk, or Interrupt endpoints, each with a configurable packet buffer.
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Configurable Control Endpoint 0.
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Interface to packet buffers.
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Software controlled disconnect signaling allows device enumeration
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Software control of USB suspend and root port reset detection.
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Software controlled device remote wakeup.
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Software control of root port wakeup.
Endpoint Packet Buffers
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Choice from 4 preset configurations simplify programming
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Separate 128 byte, packet buffers for endpoints 0 and C
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2 Kbytes of configurable packet buffer memory for endpoints A and B
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Supports Max Packet Size up to 1K bytes, double buffered
Local Bus Interface
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Provides slave interfaces to 8-bit or 16-bit CPU
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Provides access to internal Transmit and Receive packet buffers.
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Supports Split DMA transactions (DMA and CPU on separate data bus)
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Local interface supports both DMA and Interrupt transfers
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Supports optional multiplexed Address/Data bus using ALE for low pin count applications
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Supports indirect addressing, allowing access to all registers with only a single address bit
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Supports 5V tolerant I/O
Configuration Registers
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Internal registers are accessible from the local bus
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Main registers for common functions
•
USB Registers for the USB Interface Module
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Control registers for each endpoint
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