Cypress EZ-USB Series 2100 User Manual download pdf (Page 5)

EZ-USB Series 2100

Enumeration and

ReNumeration

Anchor Chips’ proprietary

ReNumeration™ function is the

means by which the enhanced

8051 firmware is downloaded.

How It Works

Upon power-up or plug-in, the

EZ-USB chip automatically

enumerates as a default USB

device. This allows the USB core

to download 8051 code. The USB

core logic inside EZ-USB per-

forms this initial enumeration

and code download while holding

the 8051 in reset.

Once enumerated, the host PC

downloads 8051 code into

EZ-USB RAM over the USB

interface. (Anchor Chips supplies

the software tools to incorporate

the loader into any application).

The downloaded 8051 code

contains program, data, and

enumeration tables. Once loaded,

the EZ-USB core performs a

ReNumeration cycle to simulate a

USB disconnect and reconnect to

come back as a completely new

USB device.

This entire sequence of enumera-

tion, download and ReNum-

eration happens quickly (less

than a quarter of a second) and is

transparent to the user.

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