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Intel
®
IXP42X product line and IXC1100 control plane processors—Universal Serial Bus (USB)
v1.1 Device Controller
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
522 Order Number: 252480-006US
18.5.21.8 Endpoint 15 Interrupt Request (IR15)
The interrupt request bit is set if the IM15 bit in the UDC interrupt control is set.
The IR15 bit is cleared by writing a 1 to it.
18.5.22 UDC Frame Number High Register (UFNHR)
The UDC Frame Number High Register holds the three most-significant bits of the
frame number contained in the last received SOF packet, the isochronous OUT endpoint
error status, and the SOF interrupt status/interrupt mask bit.
18.5.22.1 UDC Frame Number MSB (FNMSB)
The UFNHR[FNMSB] is the three most-significant bits of the 11-bit frame number
contained in the last received SOF packet. The remaining bits are located in the UFNLR.
This information is used for isochronous transfers.
These bits are updated every SOF.
Register Name: USIR1
Hex Offset Address: 0 x C800B05C Reset Hex Value: 0x00000000
Register
Description:
Universal Serial Bus Device Controller Interrupt Status Register 1
Access: Read/Write and Read-Only
Bits
31 876543210
(Reserved)
IR15
IR14
IR13
IR12
IR11
IR10
IR9
IR8
X 00000000
Resets (Above)
Register
USIR1
Bits Name Description
31:8 Reserved for future use.
7IR15
Interrupt Request Endpoint 15 (read/write 1 to clear).
1 = Endpoint 15 needs service.
6IR14
Interrupt Request Endpoint 14 (read/write 1 to clear).
1 = Endpoint 14 needs service.
5IR13
Interrupt Request Endpoint 13 (read/write 1 to clear).
1= Endpoint 13 needs service.
4IR12
Interrupt Request Endpoint 12 (read/write 1 to clear).
1 = Endpoint 12 needs service.
3IR11
Interrupt Request Endpoint 11 (read/write 1 to clear).
1 = Endpoint 11 needs service.
2IR10
Interrupt Request Endpoint 10 (read/write 1 to clear).
1 = Endpoint 10 needs service.
1IR9
Interrupt Request Endpoint 9 (read/write 1 to clear).
1 = Endpoint 9 needs service.
0IR8
Interrupt Request Endpoint 8 (read/write 1 to clear).
1 = Endpoint 8 needs service.