Cypress AN2131QC Producthandleiding - Pagina 5
Blader online of download pdf Producthandleiding voor {categorie_naam} Cypress AN2131QC. Cypress AN2131QC 16 pagina's. Ez-usb series 2100 usb controller
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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
EZ-USB Series 2100
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.