Cypress EZ-USB 2100 User Manual

EZ-USB™ Series 2100
USB Controller

EZ-USB Series 2100 Family

The Anchor Chips EZ-USB™ family (AN21XX/AN23XX) provides
significant improvements over other USB architectures including an
enhanced 8051 core, 4 or 8 Kbytes of RAM, an intelligent USB core, and
high-performance I/O ports. The family includes 16 different products to
accommodate the needs of different systems.

Features

·

Single-chip, low-power
solution for high-speed USB
peripherals

· Firmware downloadable

· High-performance I/O port

· Small board space (less than

1 square inch)

· 44 PQFP or 80 PQFP

· USB Specification 1.1

compliant

· Uses commercially-available

8051 software tools

· Thirty-one flexible endpoints

· All endpoints can be double

buffered

· 4 or 8 Kbytes of memory

The enhanced 8051 core provides five times the performance of the
standard 8051, while maintaining complete 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.

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 is more than the USB bandwidth.

The EZ-USB family conforms to the high-speed (12 Mbps) require­ments of USB Specification version 1.0, including support for remote
wake-up. The internal SRAM replaces Flash memory, EEPROM,
EPROM, or masked ROM that is conventionally used in other USB
solutions.

The EZ-USB family offers two packages, a 44 PQFP and an 80 PQFP.
All EZ-USB devices are pin- and software-compatible. And, all RAM
versions have ROM equivalents to allow easy migration for high­volume applications.

· Five times the speed of a

standard 8051

· Supports composite devices

· I²C controller

· Supports isochronous, bulk,

control, and interrupt data

· On-chip PLL

EZ-USB Series 2100

AN2121SC AN2321SC
AN2125SC AN2325SC
AN2126SC AN2326SC
AN2131SC AN2331SC
AN2135SC AN2335SC
AN2136SC AN2336SC
AN2131QC AN2331QC

Complete USB Design Made Easy

With the EZ-USB family, the
peripheral designer gains
two overall advantages:
First, the design is much
simpler because of the
chip’s significant
integration and built-in
flexibility. Second, the
EZ-USB architecture
reduces software code
significantly over other USB
solutions. This combination
gives users a quick and easy
path toward obtaining a
working prototype.

High-Speed

Peripheral

I/O

DMS
Controller
(Optional)

Anchor Chips’ EZ-USB family
eliminates the need to become an
expert in USB. It allows the
designer to take advantage of the
benefits of USB without investing
large amounts of time and
energy. With the EZ-USB family,
peripheral designers can have
USB traffic running within
hours, instead of weeks as with
other USB solutions.

The EZ-USB family of controllers
simplifies the process of imple­menting USB hardware and
software development for
peripheral manufacturers. Low­level USB protocol requirements
are automatically handled by the
Anchor smart USB core and the
included software utilities.

Typical USB

Implementation

Shared

Memory

Flash ROM

EEPROM

EPROM

ROM

Protocol

Controller

USB

Chip

USB

Port

How does Anchor Chips
make USB easy?

A typical USB
implementation uses

1

nonvolatile memory
(EPROM, EEPROM, Flash memo­ry), a microprocessor, RAM, USB
SIE and DMA. The EZ-USB
family includes all the building
blocks for a complete and low­cost USB solution in a single chip.
The design is much simpler since
timing and interface analysis are
significantly reduced.

Anchor USB

Solution

Micro-

processor

The EZ-USB RAM
architecture provides
design and software

2

flexibility. Its “soft” configuration
enables peripheral manufacturers
and designers to make changes to
the USB device through software.
This means complete flexibility
with minimal design risks.

The EZ-USB family uses
an intelligent USB core to

3

simplify 8051 firmware
code by as much as 80%. This
reduces the firmware designer’s
need to develop code to handle
the low-level nuances of the USB
specification. The designer is free
to concentrate on higher level
functions. EZ-USB firmware
development is quick, requiring
less binary code and reducing the
likelihood of errors.

With the EZ-USB family’s

software utilities and

tools, firmware develop-

4

ment is simplified and accelerated.
Firmware can be tested indepen­dent of drivers, allowing the
firmware developer and driver
software developer to write code
simultaneously. They do not need
each other to verify and test code.
This dual path decreases software
development time.

EZ-USB Series 2100

Features Benefits

EZ-USB Series 2100

Single-Chip Solution

RAM Architecture

High-Performance I/O

4- or 8-Kbyte
Pin- and Software­Compatible Family

EZ-USB Firmware
Architecture

Lower overall system cost
Minimum board space with 44 PQFP and 80 PQFP packages
Quicker design and faster time to market than other USB solutions
Minimal design resources

Quick changes in firmware and driver code
Updates in the field via software downloads
Flexibility in multiple configurations
Dynamic changes in performance/properties based on user’s needs

Transfers a full 1024-byte isochronous packet within one USB frame
Provides highest quality full-motion video or audio performance
Data I/O rate greater than 2 Mbyte/sec for bulk and isochronous packets
Fastest response time for the end user

Easy transition from RAM to ROM for high-volume applications
Pin- and software-compatible options for program code growth
No change in hardware as needs change
Lowers system cost since only minimal memory size is needed

Significantly less 8051 USB code since core handles most USB activity
Shortened USB learning curve
Quicker working prototypes and final production models
More software development time to devote to the peripheral function

Enhanced 8051 Core

Anchor USB Core/
ReNumeration
Capability

EZ-USB Xcelerator
Development Kit

Low 3.3V Power

Five External Interrupts

Separate Memory
Expansion Port

Five times faster performance than 8051
No new 8051 software tools to learn

External EPROM components eliminated
A quick path to working prototypes
User-selectable changes in peripheral properties without disconnecting

Speedier firmware and driver development
Independent development of firmware and driver
Fewer software errors
No custom Windows® driver needed to test USB traffic and firmware

Meets the 100 mA power-up specification
Useful in bus-powered applications
Useful in power-sensitive applications such as battery-powered equipment

Flexible without sacrificing standard 8051 interrupts

Design flexibility in USB program code
No sacrifice in I/O capability for high-functionality peripheral devices
Non-multiplexed, requiring no external latch

Unprecedented “Soft” Architecture

Soft Configuration

Host PC

The focus of the EZ-USB
family is to provide the
peripheral designer a
multitude of design
configurations and
migration paths. The “soft,”
programmable nature of the
EZ-USB architecture
provides flexibility while
minimizing risks.

USB requires synchronization
between four major technology
suppliers: operating system,
UHCI/OHCI interfaces, hub
controllers, and peripheral
devices. In a traditional hard­ware configuration, ensuring
that a peripheral device will
work with every combination of
these technologies is a time­consuming and expensive task.

Using the EZ-USB chip’s “soft”
configuration, the peripheral
developer can easily devise
workarounds or accommodate
dynamic changes. At the same
time, there is minimum risk to
design implementation.

Peripheral manufacturers can
provide firmware updates in
conjunction with driver changes
via a floppy disk or through
Internet downloads. Thus,

Code

Download

Anchor Chips

USB Controller

Now it’s easy.

¤

Hardware configuration

¤

RAM

software device configurability
provides easy field updates, last
minute software code changes
prior to production, or alterations
due to ever-changing standards.
In these ways, the EZ-USB chip
makes development easier and
guards against product obsoles­cence.

RAM Architecture

With an enhanced 8051 core
combined with 4 or 8 Kbytes of
SRAM in a single chip, users have a
complete solution. The 8051’s
firmware can be stored in the hard
disk (along with the driver) and
downloaded into the peripheral
during its initialization. That
makes updates as easy as updating
any other PC software.

Software upgrades

¤

Memory enhancements

¤

Feature upgrades

EZ-USB Series 2100

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 per­forms 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 enumera­tion, download and ReNum­eration happens quickly (less
than a quarter of a second) and is
transparent to the user.