PD_GFX
16KB unified RAM
8KB DRAM
WKUP
System power clock manager
Cortex-M3 subsystem
MSG1
INTR1
Legend:
Interrupt
Alternate Interrupt/Event
s/w message
Alternate s/w message
Data flow
Cortex-
M3
PD_PER
INTR2
MSG3
TXEV
RXEV
INTR3
PD_MPU
(Cortex-A8)
Bus
Power
Idle
Bus
Power
connect/
disconnect
MBX
Interconnect
IP/Peripherals
Power
Idle
MSG3
Control
PRCM
Power, Reset, and Clock Management
Figure 8-6. System Level View of Power Management of Cortex A8 MPU and Cortex M3
The Cortex-M3 handles all of the low-level power management control of the AM335x. A firmware binary
is provided by Texas Instruments that includes all of the necessary functions to achieve low power modes.
Inter-Processor Communication (IPC) registers (ipc_msg_regx, located in the
)
are available to communicate with the Cortex-M3 so the user can provide certain configuration parameters
based on the level of low power that is required.
provides a mapping of these registers.
515
SPRUH73H – October 2011 – Revised April 2013
Power, Reset, and Clock Management (PRCM)
Copyright © 2011–2013, Texas Instruments Incorporated