XR22804 Datasheet, PDF (26/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

XR22804
Bit
0
Default
Description
0
Enable
Enables the customized interrupt packet format to report all GPIO status in the interrupt packet.
0: Use standard interrupt packet. See Table 6 and Table 7.
1: Use customized interrupt packet. See Table 8.
Offset
Field
0
bmRequestType
1
bNotification
2
wValue
4
wIndex
6
wLength
8
Data
Table 6: Interrupt Packet Format
Size
(Bytes)
1
Value
8’b10100001
1
8’h20
2
16’h0000
2
16’h0000
2
16’h0002
2
Standard int_status
(See Table 7) For
customized int_status
Size = 4 bytes (See
Table 8)
Description
D7 = Device-to-host direction
D6:5 = Class Type
D4-0: = Interface Recipient
Defined encoding for SERIAL_STATE
D15-8 = Reserved (0)
D7-0 = Interface number, 8’h00 for
the CDC Command Interface
2 bytes of transferred data
D15-7 = Reserved (0)
D6 = bOverRun
D5 = bParity
D4 = bFraming
D3 = bRingSignal (RI)
D2 = bBreak
D1 = bTxCarrier (DSR)
D0 = bRxCarrier (CD)
Table 7: Data Field of Standard Interrupt Packet
Bits
D15..D7
D6
D5
D4
D3
D2
D1
Field
bOverRun
bParity
bFraming
bRingSignal
bBreak
bTxCarrier
D0
bRxCarrier
Description
Reserved (future use)
Received data has been discarded due to overrun in the device.
A parity error has occured.
A framing error has occured.
State of ring signal detection of the device.
State of break detection mechanism of the device.
State of transmission carrier. This signal corresponds to V.24 signal
106 and RS-232 signal DSR.
State of receiver carrier detection mechanism of device. This signal
corresponds to V.24 signal 109 and RS-232 signal DCD.
© 2015 Exar Corporation
26 / 47
exar.com/XR22804
Rev 1B