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2
I
C on Pin Group 0
2
Figure 90.
I
C on USB Pin Group 0
U1
USB.DP/ALTSCI
USB.DM/ALTSDA
I 2 C
combiner
controller
OMAP5912
SPRU761A
OMAP5912 supports a mode in which the OMAP5912 I
out via USB pin group 0 pins. In this mode of operation, top-level pin
multiplexing is configured to provide the SCL signal on the USB.DP pin and
the SDA signal on the USB.DM pin. This is configured using the
USB_TRANSCEIVER_CTRL.CONF_USB0 register, (see Figure 90). You
must also set USB_TRANSCEIVER_CTRL.CONF_USB0_ISOLATE to 1 to
2
ensure that the I
C signals have no effect on the OMAP5912 USB controllers.
ALTSCL
ALTSDA
I 2 C
I2C.SCL
SCL
I2C.SDA
SDA
This mode of operation does not allow mastering I
on pins USB.DP and USB.DM. Mastering I
2
master I
C device connected externally to SCL and SDA is only able to access
2
the I
C slaves on SCL and SDA or the OMAP5912 I
function. An external master I
slaves on ALTSCL and ALTSDA.
I 2 C
slave
Note: Master I 2 C devices not allowed
on ATLSCL/ALTSDA
I 2 C
slave
2
C is allowed on SCL and SDA. A
2
C device on SCL and SDA cannot access I
Universal Serial Bus (USB)
USB OTG Controller
2
C signals are brought
I 2 C
slave
I 2 C
I 2 C
master
slave
2
2
C devices on the I
C link
2
C controller slave
2
C
311
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