Preliminary
MPU Subsystem
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Table 1-8. MPU Power States
Power State
Logic Power
Memory Power
Clocks
Active
On
On or Off
On (at least one clock)
Inactive
On
On or Off
Off
Off
Off
Off
Off (all clocks)
1.2.8.3
Power Modes
The major part of the MPU subsystem belongs to the MPU power domain. The modules inside this power
domain can be off at a time when the ARM processor is in an OFF or standby mode. IDLE/WAKEUP
control is managed by the clock generator block but initiated by the PRCM module.
The MPU Standby status can be checked with PRCM.CM_IDLEST_MPU[0] ST_MPU bit. For the MPU to
be on, the core (referred here as the device core) power must be on. Device power management does not
allow INTC to go to OFF state when MPU domain is on (active or one of retention modes).
The NEON core has independent power off mode when not in use. Enabling and disabling of NEON can
be controlled by software.
CAUTION
The MPU L1 cache memory does not support retention mode, and its array
switch is controlled together with the MPU logic. For compliance, the L1
retention control signals exist at the PRCM boundary, but are not used. The
ARM L2 can be put into retention independently of the other domains.
outlines the supported operational power modes. All other combinations are illegal. The ARM
L2, NEON, and ETM/Debug can be powered up/down independently. The APB/ATB ETM/Debug column
refers to all three features: ARM emulation, trace, and debug.
The MPU subsystem must be in a power mode where the MPU power domain, NEON power domain,
debug power domain, and INTC power domain are in standby, or off state.
Table 1-9. MPU Subsystem Operation Power Modes
Mode
MPU and ARM Core
AMR L2 RAM
NEON INTC
Device Core and
APB/ATB Debug
Logic
ETM
1
Active
Active
Active
Active
Disabled or enabled
2
Active
Active
OFF
Active
Disabled or enabled
3
Active
RET
Active
Active
Disabled or enabled
4
Active
RET
OFF
Active
Disabled or enabled
5
Active
OFF
Active
Active
Disabled or enabled
6
Active
OFF
OFF
Active
Disabled or enabled
7
OFF
RET
OFF
OFF
Disabled or enabled
8
Standby
Active
Standby
Active
Disabled or enabled
9
Standby
Active
OFF
Active
Disabled or enabled
10
Standby
RET
Standby
Active
Disabled or enabled
11
Standby
RET
OFF
Active
Disabled or enabled
12
Standby
OFF
Standby
Active
Disabled or enabled
13
Standby
OFF
OFF
Active
Disabled or enabled
14
OFF
OFF
OFF
OFF
Disabled or enabled
106 Chip Level Resources
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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