DSP3系统与实验教程_2812CPUppt课件.ppt

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1、2812的CPU第三讲回顾：CPU+存储器+片内外设32x32bitMultiplierSectoredFlashA(18-0)D(15-0)ProgramBusDataBusRAMBootROM2232-bitAuxiliaryRegisters332bitTimersRealtimeJTAGCPURegisterBusR-M-WAtomicALUPIEInterruptManager323232EventManagerAEventManagerB12-bitADCWatchdogMcBSPCAN2.0BSCI-ASCI-BSPIGPIODataBus32-bitAuxiliaryReg

2、isters332bitTimersRealtimeJTAGCPURegisterBusR-M-WAtomicALUProgramBusPIEInterruptManager32x32bitMultiplier32位定点DSP32x32位定点MAC双16x16位单周期定点MAC(DMAC)32-/64-bitsaturation64/32and32/32modulusdivisionFastinterruptservicetime单周期read-modify-write指令Uniquereal-timedebuggingcapabilitiesUpwardcodecompatibility

3、MCU/DSPbalancingcodedensity&executiontime.Supports32-bitinstructionsforimprovedexecutiontime;Supports16-bitinstructionsforimprovedcodeefficiency一、主要性能二、乘法器和ALU/移位器XT(32)orT/TLMULTIPLIER32x32orDual16x16P(32)orPH/PLAH(16)DataBusDataBusProgramBusALU(32)3232323232AL(16)3232•16/328/16ShiftR/L(0-16)ACC(

4、32)AH.MSBAH.LSBAL.MSBAL.LSB32ShiftR/L(0-16)32ShiftR/L(0-16)32168/16/32三、XARnandDPXAR0XAR1XAR2XAR3XAR4XAR5XAR6XAR7ARAUMUXDataMemoryMUXDP(16)DataBusProgramBus6LSBfromIRXARn32-bitsARn16-bits22322021/9/362021/9/36Data-writeAddressBus(32)ProgramAddressBus(22)ExecutionR-M-WAtomicALUReal-TimeEmulation&

5、TestEngineProgram-readDataBus(32)JTAGProgramDecoderPCXAR0toXAR7SPDP@XARAUMPY32x32XTPACCALURegistersDebugRegisterBus/ResultBusData/Program-writeDataBus(32)Data-readAddressBus(32)Data-readDataBus(32)MemoryData(4G*16)Program(4M*16)StandardPeripheralsExternalInterfaces四、总线结构五、AtomicRead/Modify/WriteR

6、egistersALU/MPYLOADSTOREWRITEREADCPUMemAtomicInstructionsBenefits:SimplerprogrammingSmaller,fastercodeUninterruptible(Atomic)MoreefficientcompilerAND*XAR2,#1234h2words/1cyclesAtomicRead/Modify/WriteMOVAL,*XAR2ANDAL,#1234hMOV*XAR2,ALDINTEINT6words/6cyclesStandardLoad/Store六、CPU寄存器六、CPU寄存器1、被乘数寄存器--

7、XTXT，存放32位有符号整数；TL，存放16位有符号整数，符号自动扩展；T，存放16位有符号整数或存放移位值。例：ASRAX,T;T中低4位是移位值ASRLACC,T;T中低5位是移位值2、乘积寄存器--P存放32位乘法的结果(指令确定哪一半)；存放16位或32位数据；读P时要经移位器，移位值由PM(ST0中)决定：PM值结果移位模式PM值结果移位模式000左移1位100右移3位001不移101右移4位010右移1位1