Texas Instruments OMAP36 Series, Technical Reference Manual, Page: 2436 / 3738

System control module
- Msuspend muxing
- Observability muxing
- Pad configuration
- Save and restore pad configuration
- Device modules control
- Device status registers
Device
Device
modules
L4-Core interconnect
scm-001
Public Version
SCM Overview
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13.1 SCM Overview
The system control module (SCM) allows software control of the various static modes supported by the
device. The SCM is on the L4-Core interconnect, but it is sensitive only to the device internal power-on
reset (POR). It is not affected by the L4-Core reset.
For emulator devices, the POR can also be controlled by the debugger through the JTAG® interface.
The device uses the SCM as the primary point of control for these areas:
•
Pad functional input/output (I/O) multiplexing
• Pad pullup/pulldown configuration (pullup or pulldown enable)
• Pad groups associated signal integrity controls
• Device status
• Peripheral sensitivity to the microprocessor unit (MPU) and/or the digital signal processor (DSP)
(IVA2.2) MSuspend signals
• Static device configuration
• Debug and observability I/O multiplexing
• Save-and-restore pad configuration
Figure 13-1 provides an overview of the SCM.
Figure 13-1. SCM Overview
The SCM primarily implements a bank of registers accessible by the software. Some are read-only
registers that carry status information, and others are fully accessible (read/write).
The read/write registers are divided into the following classes:
•
Pad functional multiplexing and configuration registers (32-bit registers, one register per two pins)
• Pad groups (not individual per pad) associated registers for signal integrity parameters control (32-bit
read/write registers )
• Debug and observability I/O multiplexing register (32-bit read/write register)
• Static device configuration registers (32-bit read/write registers for module specific configuration)
• Scratchpad memory bank (256* 32-bit)
13.2 SCM Environment
The SCM allows the setting of external system direct memory access (sDMA) request pin sensitivity and
controls the multiplexing of device internal modules signals routed to external pins for hardware debug
purposes. The SCM also integrates the decoding logic of sys_boot[5:0].
2436 System Control Module SWPU177N – December 2009 – Revised November 2010
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