Data Sheet, Rev. 1
August 2004
USS-820FD
USB Device Controller
Features
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New Features After Revision B
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Full compliance with the
Universal Serial Bus
Specification Revision 1.1.
Backward compatible with USS-820B, USS-820C,
and USS-820D revisions.
Self-powered or bus-powered USB device. Meets
USB power specifications for bus-powered
devices.
Full-speed USB device (12 Mbits/s).
USB device controller with protocol control and
administration for up to 16 USB endpoints.
Supports control, interrupt, bulk, and isochronous
transfers for all 16 endpoints.
Programmable endpoint types, FIFO sizes, and
internal 1120-byte logical (2240-byte physical for
dual-packet mode) shared FIFO storage allow a
wide variety of configurations.
Dual-packet mode of FIFOs reduces latency.
Supports USB remote wake-up feature.
On-chip crystal oscillator allows external 12 MHz
crystal or 3 V/5 V clock source.
On-chip analog PLL creates 48 MHz clock from
internal 12 MHz clock.
Integrated USB transceivers.
5 V tolerant I/O buffers allow operation in 3 V or
5 V system environments for 0 °C to 70 °C temper-
ature range.
5 V tolerant I/O buffers allow operation in 3 V only
system environments for –20 °C to +85 °C temper-
ature range.
Implemented in Agere Systems Inc. 0.25
µm,
3 V
standard-cell library.
48-ball TFSBGAC.
(Lead-free package also avail-
able. (See Ordering Information on page 51.)
Evaluation kit available.
New, centralized FIFO status bits and interrupt out-
put pin reduce firmware load.
New, additional nonisochronous transmit mode
allows NAK response to cause interrupt.
Isochronous behavior enhancements simplify firm-
ware control.
Additional FIFO sizes for nonisochronous end-
points.
USB reset can be programmed to clear device
address.
USB reset output status pin.
Firmware ability to wake up and reset a suspended
device.
Lower power.
5 V supply no longer required for 5 V tolerant oper-
ation.
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Applications
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Suitable for peripherals with embedded micropro-
cessors.
Glueless interface to microprocessor buses.
Support of multifunction USB implementations,
such as printer/scanner and integrated multimedia
applications.
Suitable for a broad range of device class peripher-
als in the USB standard.
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Note:
Advisories are issued as needed to update product information. When using this data sheet for design purposes, please contact
your Agere Systems Account Manager to obtain the latest advisory on this product.
AGERE [ AGERE SYSTEMS ]
