Texas Instruments TMS320DM643x Local Reset, Executing State Transitions, Module State Transitions

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Executing State Transitions

6.3.3 Local Reset

In addition to module reset (described in Section 6.3.2), the DSP CPU can be reset using a special local reset. When DSP local reset is asserted, the DSPs internal memories (L1P, L1D, and L2) are still accessible. The local reset only resets the DSP CPU core, not the rest of the DSP subsystem, as the DSP module reset would.

Module reset takes precedence over Local Reset; therefore, Local Reset is not useful when the DSP is in SyncReset or SwRstDisable state.

See Chapter 10 for more information on local reset and scenarios where this can be used.

The procedures for asserting and de-asserting DSP local reset are as follows:

1.Clear the LRST bit in MDCTL39 to 0 (assert the DSP local reset).

2.Set the LRST bit in MDCTL39 to 1 (de-assert DSP local reset). If the DSP is in the enable state, it immediately executes program instructions after reset is de-asserted.

6.4Executing State Transitions

This section describes how to execute state transitions for device modules.

6.4.1 Power Domain State Transitions

The DM643x DMP consists of only one power domain--the AlwaysOn power domain. This AlwaysOn Power Domain is always in the ON state when the chip is powered-on. You are not allowed to change this power domain state to OFF.

6.4.2 Module State Transitions

This section describes the procedure for transitioning the module state. All DM643x DMP modules are on the AlwaysOn domain (Power Domain 0).

Note that some peripherals have special programming requirements and steps you must take before you can invoke the PSC module state transition. Refer to the individual peripheral reference guide for more details. For example, the DDR2 memory controller requires that you first place the DDR memory in self-refresh mode before you invoke the PSC module state transition, if you want to maintain the memory content.

Note: The following procedure is directly applicable for all modules, except for the DSP in the DM643x DMP. To transition the DSP module state, you must be aware of several system considerations.

The procedure for module state transitions is as follows (where n corresponds to the module):

1.Wait for the GOSTAT[0] bit in PTSTAT to clear to 0. You must wait for any previously initiated transitions to finish before initiating a new transition.

2.Set the NEXT bit in MDCTLn to SwRstDisable (0), SyncReset (1), Disable (2h), or Enable (3h).

Note: You may set transitions in multiple NEXT bits in MDCTLn in this step. Transitions do not actually take place until you set the GO[0] bit in PTCMD in a later step.

3.Set the GO[0] bit in PTCMD to 1 to initiate the transition(s).

4.Wait for the GOSTAT[0] bit in PTSTAT to clear to 0. The modules are safely in the new states only after the GOSTAT[0] bit in PTSTAT is cleared to 0.

SPRU978E–March 2008

Power and Sleep Controller

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Contents Reference Guide Submit Documentation Feedback Contents PLL Controller Command Register Pllcmd Boot Modes ResetList of Figures List of Tables Submit Documentation Feedback About This Manual Read This FirstNotational Conventions Related Documentation From Texas InstrumentsTMS320C6000, C6000 are trademarks of Texas Instruments Introduction Peripherals Block DiagramIntroduction Components of the DSP Subsystem DSP Subsystem in TMS320DM643x DMPSubmit Documentation Feedback TMS320C64x+ Megamodule TMS320C64x+ CPU TMS320C64x+ Megamodule Block Diagram 1 L1P Controller Memory ControllersL1D L1P3 L2 Controller 2 L1D ControllerInternal DMA Idma External Memory Controller EMCInterrupt Controller Intc Power-Down Controller PDCInternal Peripherals Bandwidth Manager Submit Documentation Feedback Memory Map Memory Interfaces Overview System MemoryDSP Internal Memory L1P, L1D, L2 Memory MapExternal Memory Internal Peripherals1 DDR2 External Memory Interface Memory Interfaces OverviewExternal Memory Interface Asynchronous Emif InterfaceSubmit Documentation Feedback Overview Clock Domains Device ClockingClock Domains OverviewCore Domains System Clock Modes and Fixed Ratios for Core Clock DomainsHecc Overall Clocking DiagramExample PLL1 Frequencies and Dividers 27 MHZ Clock Input Core Frequency FlexibilityCore Voltage DividerExample PLL2 Frequencies Core Voltage = 3 DDR2/EMIF ClockPeripheral I/O Domain Clock 4 I/O DomainsVideo Processing Back End Possible Clocking Modes VPSSCLKCTL.MUXSEL Bit Clocking Mode DescriptionPLL Controller PLL1 Control PLL ModuleSteps for Changing PLL1/Core Domain Frequency Device Clock GenerationSystem PLLC1 Output Clocks PLLC1 Output Clock Used byInitialization to PLL Mode from PLL Power Down Changing PLL Multiplier Example 5-1. Calculating Number of Clock Cycles N Changing Sysclk DividersDDR PLLC2 Output Clocks PLL2 ControlPllout Output Clock Used bySteps for Changing PLL2 Frequency 2.1 DDR2 Considerations When Modifying PLL2 FrequencyInitialization to PLL Mode from PLL Power Down Changing PLL Multiplier Example 5-2. Calculating Number of Clock Cycles N PLL and Reset Controller Registers PLL and Reset Controller ListPLL and Reset Controller Base Address End Address Size PLL Controller RegistersReset Type Status Register Rstype Field Descriptions Reset Type Status Register RstypePeripheral ID Register PID Peripheral ID Register PID Field DescriptionsPLL Control Register Pllctl Field Descriptions PLL Control Register PllctlPLL Controller Divider 1 Register PLLDIV1 PLL Multiplier Control Register PllmPLL Multiplier Control Register Pllm Field Descriptions D1ENPLL Controller Divider 3 Register PLLDIV3 PLL Controller Divider 2 Register PLLDIV2D2EN D3ENOD1EN Oscillator Divider 1 Register OSCDIV1Bpden Bypass Divider Register Bpdiv13. Bypass Divider Register Bpdiv Field Descriptions PLL Controller Status Register Pllstat PLL Controller Command Register PllcmdGoset StableALN2 ALN1 PLL Controller Clock Align Control Register AlnctlALN3 ALN2SYS3 Plldiv Ratio Change Status Register DchangeSYS3 SYS2 SYS1 18. Clock Enable Control Register Cken Field Descriptions Clock Enable Control Register CkenObsen Auxen Obsen19. Clock Status Register Ckstat Field Descriptions Clock Status Register CkstatBpon Obson Auxon20. Sysclk Status Register Systat Field Descriptions Sysclk Status Register SystatSYS3ON SYS2ON SYS1ON SYS3ONPower and Sleep Controller Power and Sleep Controller PSC Integration Number Module Name Default Module State MDSTAT.STATE Power Domain and Module TopologyDM643x DMP Default Module Configuration Power Domain States Power Domain and Module StatesModule States Module StatesPower Domain State Transitions Local ResetExecuting State Transitions Module State TransitionsIcePick Emulation Support in the PSC IcePick Emulation CommandsPSC Interrupts Interrupt EventsModule State Emulation Events Local Reset Emulation EventsInterrupt Registers Interrupt Handling Power and Sleep Controller PSC RegistersPSC Registers Offset Register DescriptionInterrupt Evaluation Register Inteval Field Descriptions Peripheral Revision and Class Information Register PIDInterrupt Evaluation Register Inteval Module Error Clear Register 1 MERRCR1 Module Error Pending Register 1 MERRPR1Module Error Pending Register 1 MERRPR1 Field Descriptions Module Error Clear Register 1 MERRCR1 Field DescriptionsGOSTAT0 Power Domain Transition Command Register PtcmdPower Domain Transition Status Register Ptstat Pordone POR Power Domain Status 0 Register PDSTAT0State PordoneNext Power Domain Control 0 Register PDCTL014. Module Status n Register MDSTATn Field Descriptions Module Status n Register MDSTATn15. Module Control n Register MDCTLn Field Descriptions Module Control n Register MDCTLnEmuihbie Emurstie Lrst EmuihbieSubmit Documentation Feedback Power Management PSC and Pllc Overview Power Management Features DescriptionClock Management PLL Bypass and Power DownModule Clock ON/OFF Module Clock Frequency ScalingDSP Sleep Modes DSP Sleep Mode ManagementDSP Module Clock ON/OFF DSP Module Clock onDSP Module Clock Off 3.3 V I/O Power DownVideo DAC Power Down Submit Documentation Feedback Interrupt Controller Submit Documentation Feedback System Module Device Boot Configuration Status Device ConfigurationDevice Identification Pin Multiplexing ControlVpss Clock and DAC Control Timer Control3 DDR2 VTP Control HPI ControlBus Master DMA Priority Control Bandwidth ManagementTMS320DM643x DMP Master IDs DSP CFGBoot Control Edma Transfer Controller ConfigurationTMS320DM643x DMP Default Master Priorities DSP DMA DSP CFG EmacSubmit Documentation Feedback 10.1 Reset10.2 10.3Device Configurations at Reset Reset PinsReset Types Type Initiator EffectDSP Local Reset DSP ResetDSP Module Reset Software Reset Disable SwRstDisableSynchronous Reset SyncReset Boot Modes Submit Documentation Feedback Additions/Modifications/Deletions Revision HistoryTable A-1. Document Revision History Rfid Products ApplicationsDSP
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