XR21V1410IL-0A-EB Datasheet, PDF (24/28 Pages) Exar Corporation – 1-CH FULL-SPEED USB UART

XR21V1410
1-CH FULL-SPEED USB UART
TABLE 16: INTERRUPT PACKET FORMAT
REV. 1.3.0
OFFSET
FIELD
SIZE
(BYTES)
VALUE
DESCRIPTION
0 bmRequestType 1
8’b10100001
D7 = Device-to-host direction
D6:5 = Class Type
D4-0: = Interface Recipient
1
bNotification
1
8’h20
Defined encoding for SERIAL_STATE
2
wValue
2
16’h0000
4
wIndex
2
16’h0000 D15-8 = Reserved (0)
D7-0 = Interface number, 8’h00 for the CDC Com-
mand Interface
6
wLength
2
16’h0002 2 bytes of transferred data
8
Data
2
Standard D15-7 = Reserved (0)
int_status _{D6 = bOverRun}
(See Table 17 _{D5 = bParity}
or Table 18) _{D4 = bFraming}
D3 = bRingSignal (RI)
D2 = bBreak
D1 = bTxCarrier (DSR)
D0 = bRxCarrier (CD)
BIT(S)
D15..D7
D6
D5
D4
D3
D2
D1
D0
TABLE 17: DATA FIELD OF STANDARD INTERRUPT PACKET
FIELD
bOverRun
bParity
bFraming
bRingSignal
bBreak
bTxCarrier
bRxCarrier
DESCRIPTION
Reserved (0)
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 corre-
sponds to V.24 signal 109 and RS-232 signal DCD.
If the Exar vendor specific packet mapping is enabled then the data field also includes status for all of the
UART / GPIO pins as follows:
24