Preliminary - Information Subject to Change - 9/24/98
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EZ-USB Development Kit Overview
Initial
Download
Process
The EZ-USB family provides a “soft” (RAM-based) solution that
allows unlimited configuration and upgrades. In order to
accomplish this, your system must go through an initial download
process before your final application is running.
The following list details the state of your system from the moment
the EZ-USB based device is plugged into the USB bus.
•
The Host detects that your device is plugged in and asks the
device for it’s ID’s
•
The device responds with ID’s that represent your non-
downloaded device: (Vendor=XYZ Corp,
Product=GIZMOLOADER).
•
The Host PC sees these ID’s and knows to load your Loader
Driver (based on the EZLOADER example in the Driver
directory on the CD).
Figure 1-2: Final EZ-USB System Block Diagram
U S B D evic e
U S B -C apable c om puter
W indow s H ost
U S B D .S YS
Your C us tom U S B D evic e
D river
A pplic ation
P rogram
E Z -U S B
8051 A pplic ation
F irm w are
U S B
B us
