AN2720 Data Sheet Version 1.0
06/07/00
Page 3
EZ-Link (AN2720SC)
CHIP DETAILS
The AN2720 contains two slave interfaces that transfer data between through a 2-kilobyte FIFO.
It also contains two 5V to 3.3V regulators to supply power to the chip and to the USB pullup
resistor. Figure 2 of this document shows a functional block diagram of the AN2720. The
AN2720 contains:
! Two 5V to 3.3V regulators, which deliver clean, regulated power to the chip and to
the pullup resistor connected to the USB D+ line. These regulators are powered by the
USB 5V line.
! Two USB transceivers, one for each computer.
! Two USB cores, each consisting of a Serial Interface Engine (SIE) and an intelligent
machine that can respond to standard USB requests. These are the same enhanced SIE’s
used in Cypress’ line of EZ-USB products.
! A 2-Kilobyte FIFO which is used to buffer multiple packets between computers to
optimize data throughput.
! Control logic to manage transfer of USB data between the two SIEs.
! A single-crystal oscillator and PLL, shared by both SIE’s.
SOFTWARE SUPPORT
Software is provided in two different configurations: Ethernet drivers or Ethernet plus bridging
software.
The Ethernet drivers run on Windows 95/98/2000 and are miniport device driver software which
emulates a network interface connector. It manages the USB protocol and the PC-to-PC data
flow. The EZ-Link Ethernet device driver is written to the NDIS (Network Driver Interface
Specification) standard and provides a standard Windows interface to the resources of the
hardware. To the end user, EZ-Link appears and behaves like an Ethernet card even though no
physical network interface card is present. Thus, users can use standard Windows interface such
as Windows Explorer, Network Neighborhood and standard file sharing security features. With
this driver, users can use multiple EZ-Links to generate their own private mobile network, with
access to other peripheral devices such as printers appearing as network peripherals.
The Ethernet plus bridging drivers run on Windows 95/98/2000. In addition to the Ethernet
connection capability between multiple EZ-Links, users can connect to corporate LANs using
the PC that has both EZ-Link and a corporate Ethernet connection as a bridge device. With this
capability, users have complete access to corporate LAN resources.
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