USS-820D
USB
Device
Controller
Data
Sheet,
Rev
.
5
January
2002
Table
of
Contents
Contents
Features
. .
.
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.
... .........
.
........................................
.
............
.
. .
New
Features
After
Revision
B
....................................
.
............
.
. .
Applications
............
.
............
.
........................................
.
............
.
. .
Description
..............
.
............
.
........................................
.
............
.
. .
Serial
Interface
Engine
...........................................
.
............
.
. .
Protocol
Layer
.............................
.
...........................
.
............
.
. .
FIFO
Control
.....
.
............
.
........................................
.
............
.
. .
FIFO
Programmability
.................
.
............
.
. . . . . . . . . . . . . .
.
............
.
. .
F
I
FO
Access
.....
.
............
.
........................................
.
............
.
. .
Transmit
FIFO
........
.
........................................
.
............
.
. .
Receive
FIFO
.........
.
........................................
.
............
.
. .
Pin
Information
......
.
... .........
.
........................................
.
............
.
. .
Register
Timing
Characteristics
....................................
.
............
.
. .
Register
Interface
...
.
............
.
........................................
.
............
.
. .
Special
Firmware
Action
for
Shared
Register
Bits
. .
.
............
.
. .
Register
Reads
with
Side
Effects
.
.
............
.
...........................
.
Register
Descriptions
....................
.
............
.
...........................
.
Interrupts
............................................
.
............
.
...........................
.
Firmware
Responsibilities
for
USB
SETUP
Commands
..............
.
Other
Firmware
Responsibilities
...................................
.
............
.
. .
Frame
Timer
Behavior
.........
.
........................................
.
............
.
. .
Suspend
and
Resume
Behavior
.......
.
............
.
..............................
.
Hardware
Suspend
Detect
......................................
.
............
.
. .
Firmware
Suspend
Initiate
......................................
.
............
.
. .
Hardware
Resume
Detect/Initiate
.
.
............
.
............................
Hardware
Resume
Sequence
.................................
.
............
.
. .
Firmware
Resume
Sequence
.....
.
............
.
..............................
.
Special
Suspend
Considerations
for
Bus-Powered
Devices
. .
Application
Notes
................................
.
............
.
...........................
.
USB
Application
Support Contact
Information
..............
.
............
.
. .
Absolute
Maximum
Ratings
.
.
........................................
.
............
.
. .
Electrical
Characteristics
....................
.
............
.
...........................
.
do
Characteristics
.........................
.
............
.
...........................
.
Power
Considerations
....
.
........................................
.
............
.
. .
USB
Transceiver
Driver
Characteristics
................................
.
Connection
Requirements
......................................
.
............
.
. .
USB
Transceiver
Connection
..........................
.
............
.
. .
Oscillator
Connection
Requirements
.
. . . . . . . . . . . . . .
.
............
.
. .
Outline
Diagrams
................................
.
............
.
...........................
.
44-Pin
MQFP
(USS-820D)
.........
.
............
.
..............................
.
48-Pin
TQFP
(USS-820TD)
....................................
.
............
.
. .
Ordering
Information
............
.
..............
.
............
.
...........................
.
Appendix
A
.
Special
Function
Register
Bit
Names
.......................
.
Appendix
B
.
USS-820D
Register
Map
..........................
.
............
.
. .
Appendix
C
.
Changes
from
USS-820/USS-825
Revision
B
to
C
.
Appendix
D
.
Changes
from
USS-820/USS-820T
Revision
C
to
D
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2
Agere
Systems
Inc
.
AdLib OCR Evaluation