XR21V1410_10 Datasheet, PDF (23/27 Pages) Exar Corporation – 1-CH FULL-SPEED USB UART

REV. 1.1.0
• Logic 0 = Disable GPIO4 status in custom interrupt packet.
• Logic 1 = Enable GPIO4 status in custom interrupt packet.
XR21V1410
1-CH FULL-SPEED USB UART
CUSTOM_INT_PACKET[6]: GPIO5
• Logic 0 = Disable GPIO5 status in custom interrupt packet.
• Logic 1 = Enable GPIO5 status in custom interrupt packet.
CUSTOM_INT_PACKET[7]: Reserved
This bit is reserved and should remain ’0’.
TABLE 16: INTERRUPT PACKET FORMAT
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)
TABLE 17: DATA FIELD OF STANDARD INTERRUPT PACKET
BIT(S)
D15..D7
D6
D5
D4
D3
D2
D1
D0
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.
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