
EZ-USB FX2 Technical Reference Manual
Page 15-64 EZ-USB FX2 Technical Reference Manual v2.1
Bit 0 SIGRSUME Signal Remote Device Resume
Set SIGRSUME=1 to drive the “K” state onto the USB bus. This should be done only by a
device that is capable of remote wakeup, and then only during the SUSPEND state. To signal
RESUME, set SIGRSUME=1, waits 10-15 ms, then sets SIGRSUME=0.
15.10.2 Enter Suspend State
Figure 15-64. Enter Suspend State
Bit 7-0 Suspend Enable Suspend
Regardless of Bus State
Write 0xFF to prepare the chip for standby without having to wait for a Bus Suspend.
15.10.3 Wakeup Control & Status
Figure 15-65. Wakeup Control & Status
FX2 has two pins that can be activated by external logic to take FX2 out of standby. These pins
are called WAKEUP and WU2.
Bit 7 WU2 Wakeup Initiated from WU2 Pin
The FX2 sets this status bit to1 when wakeup was initiated by the WU2 pin. Write a 1 to this bit
to clear it.
SUSPEND Put Chip into SUSPEND State E681
b7 b6 b5 b4 b3 b2 b1 b0
x x x x x x x x
W W W W W W W W
x x x x x x x x
WAKEUPCS Wakeup Control & Status E682
b7 b6 b5 b4 b3 b2 b1 b0
WU2 WU WU2POL WUPOL 0 DPEN WU2EN WUEN
R/W R/W R/W R/W R R/W R/W R/W
x x 0 0 0 1 0 1
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