Preliminary - Information Subject to Change - 9/24/98
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EZ-USB Development Kit Overview
Introduction
The Anchor Chips EZ-USB is a compact integrated circuit that
provides a highly integrated solution for implementing a USB
peripheral device. Three key EZ-USB features are:
•
The EZ-USB family provides a “soft” (RAM-based)
solution that allows unlimited configuration and upgrades.
•
The EZ-USB family delivers full USB throughput. Designs
that use EZ-USB are not limited by number of endpoints,
buffer sizes or transfer speeds.
•
The EZ-USB family does much of the USB housekeeping in
the EZ-USB core, simplifying code and accelerating the
USB learning curve.
To help reduce the development time and learning curve for making
a USB peripheral using the Anchor Chips EZ-USB device, Anchor
Chips provides the EZ-USB Developer’s Kit which this manual
describes.
The Anchor Chips EZ-USB
TM
family (AN21XX/AN23XX)
provides significant improvements over other USB architectures by
including an enhanced 8051 core, 4, 8 or 16 Kbytes of RAM, and
an intelligent USB core. The family includes 16 different products
to accommodate the needs of different systems. The enhanced 8051
core provides five times the performance of the standard 8051,
while maintaining 8051 software compatibility. With on-chip
RAM, firmware code can be downloaded from the host PC. This
allows the peripheral manufacturer to easily modify and transfer
new code to current and new users. This on-chip memory
eliminates the need for external memory in many systems.
The EZ-USB family supports high-bandwidth transfers by
providing an efficient mechanism to move data between external
memory and the USB FIFOs. Using this “turbo” mode, the 8051
core can transfer 1024 bytes of data in or out of an isochronous
FIFO in 338 microseconds. This leaves a high percentage of the
bandwidth for the processor to service the application. The EZ-
USB family also supports an equivalent data transfer rate for bulk
packets of over 2 Mbytes per second, which exceeds the USB
bandwidth. The EZ-USB family conforms to the high-speed (12
Mbps) requirements of USB Specification version 1.0, including
