XR21V1414IM-0B-EB Datasheet, PDF (29/34 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

XR21V1414
REV. 1.3.0
4-CH FULL-SPEED USB UART
CUSTOM_INT_PACKET[1]: GPIO2
• Logic 0 = Disable GPIO2 status in custom interrupt packet.
• Logic 1 = Enable GPIO2 status in custom interrupt packet.
CUSTOM_INT_PACKET[2]: Reserved
• This bit is reserved and should remain ’0’.
CUSTOM_INT_PACKET[3]: GPIO0
• Logic 0 = Disable GPIO0 status in custom interrupt packet.
• Logic 1 = Enable GPIO0 status in custom interrupt packet.
CUSTOM_INT_PACKET[4]: GPIO3
• Logic 0 = Disable GPIO3 status in custom interrupt packet.
• Logic 1 = Enable GPIO3 status in custom interrupt packet.
CUSTOM_INT_PACKET[5]: GPIO4
• Logic 0 = Disable GPIO4 status in custom interrupt packet.
• Logic 1 = Enable GPIO4 status in custom interrupt packet.
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)
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