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3FunctionalOverview
GPIO
MBus
32k 内存
双 进入
程序/数据
McBSP1
McBSP2
McBSP3
rhea 总线
APLL
计时器
JTAG
Clocks
RHEAbus
RHEA
桥
德州仪器 总线
xDMA
逻辑
16k 程序
只读存储器
Pbus
Cbus
Dbus
Ebus
RHEA总线
MBus
Pbus
Cbus
Dbus
Ebus
Pbus
增强 xio
P, c, d, e buses 和 控制 信号
XIO
HPI
54x clead
HPI
3.1memory
3.1.1datamemory
TMS320VC5409A
fixed-pointdigitalsignalprocessor
SPRS140F–NOVEMBER2000–REVISEDJANUARY2005
thefollowingfunctionaloverviewisbasedontheblockdiagraminfigure3-1.
figure3-1.tms320vc5409afunctionalblockdiagram
the5409adeviceprovidesbothon-chipromandrammemoriestoaidinsystemperformanceand
integration.
thedatamemoryspaceaddressesupto64kof16-bitwords.thedeviceautomaticallyaccessesthe
在-chipramwhenaddressingwithinitsbounds.whenanaddressisgeneratedoutsidetherambounds,
thedeviceautomaticallygeneratesanexternalaccess.
theadvantagesofoperatingfromon-chipmemoryareasfollows:
•
Higherperformancebecausenowaitstatesarerequired
•
Higherperformancebecauseofbetterflowwithinthepipelineofthecentralarithmeticlogicunit
(calu)
•
Lowercostthanexternalmemory
•
Lowerpowerthanexternalmemory
theadvantageofoperatingfromoff-chipmemoryistheabilitytoaccessalargeraddressspace.
FunctionalOverview
17