Specification
NET2272 USB Peripheral Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 1.2, October 15, 2003
57
8.4.4 (Address 03h; IRQSTAT1) Interrupt Status Register (high byte)
Bits
Description
Read
Write
Default
Value
7
Reset Status. When set, this bit indicates that either the RESET# pin is asserted, or a
USB root port reset is currently active.
Yes
No
0
6
Root Port Reset Interrupt. This bit indicates a change in state of the root port reset
detector. Writing a 1 clears this status bit.
Yes
Yes/CLR
0
5
Resume Interrupt. When set, this bit indicates that a device resume has occurred.
Writing a 1 clears this status bit.
Yes
Yes/CLR
0
4
Suspend Request Change Interrupt. This bit is set whenever there is a change in
the Suspend Request Interrupt state (bit 3 of this register). Writing a 1 clears this
status bit.
Yes
Yes/CLR
0
3
Suspend Request Interrupt. This bit is set when the NET2272 detects a USB
Suspend request from the host. The Suspend Request state cannot be set or cleared
by writing this bit. Instead, writing a 1 to this bit puts the NET2272 into the low-
power suspend mode (see section 7.1.1).
Yes
Yes/
Suspend
0
2
VBUS Interrupt. When set, this bit indicates that a change occurred on the VBUS
input pin. Read the USBCTL1 register for the current state of this pin. Writing a 1
clears this status bit.
Yes
Yes/CLR
0
1
Control Status Interrupt. This bit is set when an IN or OUT token indicating
Control Status has been received. Writing a 1 clears this status bit.
Yes
Yes/CLR
0
0
Reserved.
0
No
0
8.4.5 (Address 04h; PAGESEL) Endpoint Page Select Register
Bits
Description
Read
Write
Default
Value
7:2
Reserved.
0
No
0
1:0
Page Select. The NET2272 uses a paged architecture for accessing the registers
associated with each endpoint. This field selects which set of endpoint registers can
be accessed.
VALUE
ENDPOINT
00
EP 0
01
EP A
10
EP B
11
EP C
Yes
Yes
00
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