Chapter 08 Power, Reset, and Clock Management (PRCM).pdf

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www.ti.com Power, Reset, and Clock Management Table 8-8. Clock Domain States State Description ACTIVE IDLE_TRANSITION Every nondisabled slave module (that is, those whose MODULEMODE value is not set to disabled) is put out of IDLE state. All interface clocks to the nondisabled slave modules in the clock domain are provided. All functional and interface clocks to the active master modules (that is, not in STANDBY) in the clock domain are provided. All enabled optional clocks to the modules in the clock domain are provided. This is a transitory state. Every master module in the clock domain is in STANDBY state. Every idle request to all the slave modules in the clock domain is asserted. The functional clocks to the slave module in enabled state (that is, those whose MODULEMODE values are set to enabled) remain active. All enabled optional clocks to the modules in the clock domain are provided. All clocks within the clock domain are gated. Every slave module in the clock is in IDLE state and set to disabled. INACTIVE Every slave module in the clock domain (that is, those whose MODULEMODE is set to disabled) is in IDLE state and set to disabled. Every optional functional clock in the clock domain is gated Each clock domain transition behavior is managed by an associated register bit field in the CM__CLKSTCTRL[x] CLKTRCTRL PRCM module Table 8-9. Clock Transition Mode Settings CLKTRCTRL Bit Value Selected Mode Description 8.1.4 Power Management 0x0 Reserved NA A software-forced sleep transition. The 0x1 SW_SLEEP transition is initiated when the associated hardware conditions are satisfied 0x2 SW_WKUP 0x3 Reserved NA A software-forced clock domain wake-up transition is initiated The PRCM module manages the switching on and off of the power supply to the device modules. To minimize device power consumption, the power to the modules can be switched off when they are not in use. Independent power control of sections of the device allows the PRCM module to turn on and off specific sections of the device without affecting the others. 8.1.4.1 Power Domain A power domain is a section (that is, a group of modules) of the device with an independent and dedicated power manager (see Figure). A power domain can be turned on and off without affecting the other parts of the device. SPRUH73E–October 2011–Revised May 2012 Power, Reset, and Clock Management (PRCM) Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated 639
Power, Reset, and Clock Management www.ti.com Vdd Varray PRCM Memory array Memory array power switch Memory bank Figure 8-4. Generic Power Domain Architecture Memory array Memory logic power switch Memory logic PM Memory Logic Logic power switch Flip-flop logic Logic power switch Flip-flop logic Power domain To minimize device power consumption, the modules are grouped into power domains. A power domain can be split into a logic area and a memory area. 8.1.4.2 Power Domain Management Table 8-10. States of a Memory Area in a Power Domain State Description ON The memory array is powered and fully functional OFF The memory array is powered down Table 8-11. States of a Logic Area in a Power Domain State Description ON Logic is fully powered prcm-008 OFF Logic power switches are off. All the logic (DFF) is lost The power manager associated with each power domain is assigned the task of managing the domain power transitions. It ensures that all hardware conditions are satisfied before it can initiate a power domain transition from a source to a target power state Table 8-12. Power Domain Control and Status Registers Register/Bit Field Type Description PM__PWRSTCTRL[1:0] POWERSTATE PM__PWRSTST[1:0] POWERSTATEST PM__PWRSTST[2] LOGICSTATEST Selects the target power state of the Control power domain among OFF, ON, or RETENTION. Identifies the current state of the power Status domain. It can be OFF, ON, or RETENTION. Identifies the current state of the logic Status area in the power domain. It can be OFF or ON. 640 Power, Reset, and Clock Management (PRCM) SPRUH73E–October 2011–Revised May 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
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