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SCM Functional Description
NOTE:
Unlike gpio_126, gpio_127, and gpio_129, gpio_128 (MuxMode = 0x4) is not in the
SIM_VDDS voltage domain, and does not require PBIAS1 cell configuration. It is internally
supplied in the standard 1.8-V VDDS_IO voltage domain, and does not support 3-V mode.
PBIAS0 and PBIAS1 cells provide a voltage reference (PBIAS voltage) for biasing extended drain in the
MMC/SD/SDIO1and GPIO associated I/O cells. In addition to generating the bias voltage, the PBIAS0 cell
can detect the supply voltage (SDMMC1_VDDS ) value (1.8V or 3.0 V) and update, with its status, the
PBIASLITESUPPLYHIGH0. In addition to generating the bias voltage, the PBIAS1 cell can detect the
supply voltage (SIM_VDDS ) value (1.8 V or 3.0 V) and update it with its PBIASLITESUPPLYHIGH1
status bit.
CAUTION
A
PBIAS
cell
lets
the
peripheral
associated
with
its
corresponding
extended-drain I/O cell support 1.8-V and 3.0-V voltages. A PBIAS cell is not a
part of a peripheral, but a part of the device I/Os to which this peripheral is
internally connected. These device I/Os are not exclusive to only one
peripheral; through I/O multiplexing they can be connected to other internal
signals. It is necessary to configure the PBIAS and corresponding I/O cell to
enable the I/Os, regardless of how I/O multiplexing is configured for these
device I/Os. In other words, independently of which signal is internally
connected to a device I/O powered by SDMMC1_VDDS or SIM_VDDS, the
corresponding PBIAS must be configured.
13.4.5.2 Extended-Drain I/Os
On the device, the following extended-drain I/Os are used by I/Os from the MMC/SD/SDIO1:
•
sdmmc1_clk
•
sdmmc1_cmd
•
sdmmc1_dati (where i = 0 to 3)
The following extended-drain I/Os are used by GPIO I/Os:
•
gpio_126 (MuxMode = 0x4)
•
gpio_127 (MuxMode = 0x4)
•
gpio_129 (MuxMode = 0x4)
describes the extended-drain I/O cell.
2469
SWPU177N – December 2009 – Revised November 2010
System Control Module
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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