Device
MMC/SD/SDIO1
controller
PBIAS0 cell
Extended-
drain I/O cell
I/O signal
SCM
PBIASLITESUPPLYHIGH
0
CONTROL_PBIAS_LITE register
PBIAS voltage
PADCONF registers
PBIASLITEVMODE0
PBIASLITEPWRDNZ0
MPU INTC
M_IRQ_75
PBIAS0_ERROR
scm-014
PBIAS1 cell
Extended-
drain I/O cell
PBIAS voltage
PBIASLITEVMODE1
PBIASLITEPWRDNZ1
PBIAS1_ERROR
CONTROL_PROG_IO1 register
CONTROL_WKUP_CTRL
register
PBIASLITESUPPLYHIGH1
GPIO_IO_PWRDNZ
PRG_SDMMC1_SPEEDCTRL
Public Version
www.ti.com
SCM Functional Description
supported as the GPIO interface in the GP device, imposes the use of embedded PBIAS cells to provide
1.8-V or 3.0-V reference voltage. The PBIAS cells and the extended-drain I/Os are software-controlled by
bits located in the CONTROL.
, CONTROL.
and
CONTROL.
registers of the SCM. See
, Register Descriptions, for
the description of these registers.
shows the functional block diagram between the PBIAS cells and the extended I/O cells.
Figure 13-12. Functional Block Diagram
describes the CONTROL.
, CONTROL.
and
CONTROL.
bit controls for the PBIAS and the extended-drain I/O cells.
Table 13-8. PBIAS Cell and Extended-Drain I/O Pin Bit Controls
Control Signals for PBIAS0
Control Signals for PBIAS1
Description
and/or
and/or
Associated Extended-Drain
Associated Extended-Drain
I/O Cell
I/O Cell
PBIASLITEPWRDNZ0
PBIASLITEPWRDNZ1
The PBIASLITEPWRDNZ0 bit is used to protect the PBIAS0 cell
when the SDMMC1_VDDS power supply voltage is not stable.
The PBIASLITEPWRDNZ1 bit is used to protect the PBIAS1 cell
when the SIM_VDDS power supply voltage is not stable.
2467
SWPU177N – December 2009 – Revised November 2010
System Control Module
Copyright © 2009–2010, Texas Instruments Incorporated