XR21B1422IL40-0A Datasheet, PDF (38/60 Pages) Exar Corporation – Enhanced 2-Ch Full-Speed USB UART

Bit
1
0
Default
Description
0
RTS
0: When USE_SUSPEND is ’1,’ output will be actively driven
1: When USE_SUSPEND is ’1,’ output will be open drain
0
CLK
0: When USE_SUSPEND is ’1,’ output will be actively driven
1: When USE_SUSPEND is ’1,’ output will be open drain
XR21B1422
REVISION_ID (0x260) - Read-Only
Bit
15:0
Default
0
Revision ID
Description
USB_STATUS (0x262) - Read-Only
Bit
15:14
13
12:10
9:8
7:6
5
Default
Description
0
Reserved
These bits are reserved and should be written as ‘0’.
0
STATE1
Returns the current state of the USB_STAT2 pin.
0
SEL1
000: USB_STAT2 asserted high when in suspended state or when USB bus reset is asserted
001: USB_STAT2 asserted high when in suspended state
010: For low power device (<= 100 mA) USB_STAT2 asserted high when in suspended state. For high power device (101-500
mA) asserted high when in suspended state or when not yet configured.
011: USB_STAT2 asserted high when USB bus reset is asserted
100: USB_STAT2 asserted high when in suspended state or when USB bus reset is asserted
101: USB_STAT2 asserted low when in suspended state
110: For low power device (<= 100 mA) USB_STAT2 asserted low when in suspended state. For high power device (101-500
mA) asserted low when in suspended state or when not yet configured.
111: USB_STAT2 asserted low when USB bus reset is asserted
10
CTRL1
00: Invalid
01: USB_STAT2 open drain
10: USB_STAT2 actively driven
11: Invalid
0
Reserved
These bits are reserved and should be written as ‘0’.
0
STATE0
Returns the current state of the USB_STAT1 pin.
© 2014 Exar Corporation
38 / 60
exar.com/XR21B1422
Rev 1A