cx82100 Conexant Systems, Inc., cx82100 Datasheet - Page 148

• Manufacturer Part Number: cx82100
• Description: Home Network Processor Hnp
• Manufacturer: Conexant Systems, Inc.

8.5
8.6
8-14
Interrupt Endpoint
Summary of the Endpoints
Conexant Proprietary and Confidential Information
The interrupt endpoint is different from the other endpoints in that it does not get its data
from the TX DMA buffers or there is no TX DMA channel available for interrupt
endpoint. The interrupt endpoint relies on firmware writes to the U_IDAT register for the
interrupt data. Two writes to U_IDAT are required to furnish the 8 bytes of data for each
interrupt packet. After the first 4 bytes have been processed, a status bit
INTRNEXT_INT in U_STAT is set to indicate that the firmware can now write the next
4 bytes to U_IDAT. An INTRDN_INT status is set upon completion of the data transfer
to the host.
The UDC Endpoints are summarized in Table 8-8.
Table 8-8. UDC Endpoints
Endpoint 0
Endpoint 0
Endpoint 1
Endpoint 1
Endpoint 2
Endpoint 2
Endpoint 3
Endpoint 3
Endpoint 4
UDC Logical Endpoint No.
CX82100 Home Network Processor Data Sheet
UDC Physical Endpoint No.
1
2
3
4
5
6
7
8
9
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
Direction
Control
Control
Bulk
Bulk
Bulk
Bulk
Bulk
Bulk
Interrupt
Transfer Type
101306C