CX82100 Home Network Processor Data Sheet
8.8.11
USB Status (U_STAT: 0x00330038)
If an interrupt status bit in this register is set by the UDC, the USB Interrupt bit in the
Interrupt Status Register (INT_Stat) is set if the corresponding enable bit in the U_IER
register is set. Writing a 1 to a bit location will clear the interrupt status bit; writing a 0
has no effect.
Bit(s)
28
Type
RR
Default
1'b0
Name
Description
Receive Pending Register Nonzero Interrupt.
0 = Receive pending register is zero.
1 = Receive pending register is nonzero.
UDC_LatchIntfVal Interrupt.
RX_PEND_NONZERO_INT
27
RR
1'b0
UDC_LatchIntfVal_INT
0 = UDC_LatchIntfVal signal is not asserted.
1 = UDC_LatchIntfVal signal is asserted.
The UDC_LatchIntfVal signal is asserted by the UDC Core for
one clock, when the core receives a valid Set-Interface SETUP
command to a supported Interface and supported Alternate
Interface Setting. The signal is asserted when the UDC issues
an ACK handshake to the SETUP transfer of the Set-Interface
Command. The Interface to which this command is addressed
is available on the UDC_InterfaceVal[1:0] and the value of the
new Alternate Setting is available on the UDC_AltIntfVal[2:0]
outputs.
Using the UDC_LatchIntfVal signal, the Application can know
the Set-Interface Command along with the Interface Number to
which it is addressed to and the Alternate Setting Value,
without doing a full decode of the Setup transfer. Applications
supporting Dynamic Alternate Interfaces, can use this signal to
identify the new Alternate Setting of the Interface being
selected.
26
RR
1'b0
UDC_LatchCfgVal_INT
UDC_LatchCfgVal Interrupt.
0 = UDC_LatchCfgVal signal is not asserted.
1 = UDC_LatchCfgVal signal is asserted.
The UDC_LatchCfgVal signal is asserted by the UDC Core for
one clock, when the core receives a valid Set-Configuration
SETUP command to a supported configuration. The signal is
asserted when the UDC issues an ACK handshake to the
SETUP transfer of the Set-Configuration Command. The Value
of the new configuration is available on the
UDC_ConfigVal[1:0] outputs.
Using the UDC_LatchCfgVal signal, the Application can know
the Set-Configuration Command and the Configuration value
with out doing a full decode of the Setup transfer. Applications
supporting Dynamic Configurations or applications that do
power management based on the Current Configuration, can
use this signal to identify the new Configuration the Device is
being selected.
8-22
Conexant Proprietary and Confidential Information
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CONEXANT [ CONEXANT SYSTEMS, INC ]
