计算机硬件及组装原理Cha

《计算机硬件及组装原理Cha》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Memoryspaceofatypicalsystem•Example:Assumea24-bitaddressingrange,16-bitwidedatabus-24-bitaddressing>>16Mbyte•Assume1MbyteofRAMmemory,128KByteofROMProgramcodeandinitializationvectorsStackandheap,variablestorageROMEmptyEmptyEmptyRAM64Kx16SpaceSpaceSpace512Kx160x0IOIO0x00x0Fx01DD0F0Fee0FF00Fvv00F0Fi

2、cic0FHEardwareComputerOrgeanizationfoertheSoftwareProfessionalEssArnoldS.Berger1BytePackingWordAddress000000Byte0–Address000000Byte1–Address000001Byte2–Address000002Byte3–Address000003000004Byte0–Address000004Byte1–Address000005Byte2–Address000006Byte3–Address000007000008Byte0–Address000008Byte1–

3、Address000009Byte2–Address00000AByte3–Address00000B00000CByte0–Address00000CByte1–Address00000DByte2–Address00000EByte3–Address00000F000010Byte0–Address000010Byte1–Address000011Byte2–Address000012Byte3–Address000013FFFFF0Byte0–AddressFFFFF0Byte1–AddressFFFFF1Byte2–AddressFFFFF2Byte3–AddressFFFFF3

4、FFFFF4Byte0–AddressFFFFF4Byte1–AddressFFFFF5Byte2–AddressFFFFF6Byte3–AddressFFFFF7FFFFF8Byte0–AddressFFFFF8Byte1–AddressFFFFF9Byte2–AddressFFFFFAByte3–AddressFFFFFBFFFFFCByte0–AddressFFFFFCByte1–AddressFFFFFDByte2–AddressFFFFFEByte3–AddressFFFFFFHardwareComputerOrganizationfortheSoftwareProfessio

5、nalArnoldS.Berger2Memoryorganization(2)•Memoryorganizationusuallydependsuponthewidthoftheprocessordatabus-The68000isa32-bitprocessorinternally,butinterfacestoa16-bitdatabus-Alladdressesare32-bitsinternally,with24-bitsexternal(16M)BitBitBit7015870158700x00000x000010x000000x0000000x000001SByteAddre

6、ssableTSByteAddressableSTByteAddressableTmemoryforanIRmemoryforaRImemoryforaR8-bitprocessorGN16-bitprocessorNG16-bitprocessorIwitha16-bitwitha20-bitwitha24-bitNaddressingrangeaddressingrangeaddressingrangeGIntel80186MC68000LittleEndianBigEndian0xFFFE0xFFFF0xFFFFF0xFFFFE0xFFFFFE0xFFFFFFHardwareCom

7、puterOrganizationfortheSoftwareProfessionalArnoldS.Berger3Memoryorganization•Inbyte-addressablesystems,low-orderaddressbitsdothebyteaddressing-Example:The68000has23externaladdresslinesandcanaddress224bytes(0..16,777,21