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12.4.6
OTG ID
The UDC provides OTG ID interface support through GPIO[41]. The UDC provides
Output Control Register (UP2OCR)"
reading and the OTG ID interrupt input to detect changes in the OTG ID signal. When IDON is set
to 1, it enables the output of GPIO[41] and driven high with a weak output driver so when the OTG
ID pin on the USB connector is connected to a 100 K Ω resistor, the OTG ID input results in 1 and
when the OTG ID pin is connected to a 10 Ω resistor to ground, the GPIO[41] output driver is
unable to drive OTG ID to a 1, resulting in the OTG ID input being a 0. See
illustration of the PXA27x processor interface to OTG ID.
Figure 12-8. Connection to OTG ID
®
Intel
PXA27x Processor Family Design Guide
ID output enable (IDON) to enable the output for OTG ID
U S B D e v i c e
G P I O [ 4 1 ]
C o n t r o l l e r
U P 2 O C R [ I D E N ]
O T G I D
P X A 2 7 x P r o c e s s o r
O T G I D
1 0 0 K O h m
E N B
1 0 O h m
'USB Client Controller
"USB Port 2
Figure 12-8
for
II:12-11
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