7.12.3HPIElectricalData/Timing
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
Table7-55.TimingRequirementsforHost-PortInterfaceCycles
(1)(2)
(seeTable7-56throughFigure7-51)
-720
-850
A-1000/-1000
NO.UNIT
-1200
MINMAX
9t
su(HASL-HSTBL)
Setuptime,HASlowbeforeHSTROBElow5ns
10t
h(HSTBL-HASL)
Holdtime,HASlowafterHSTROBElow2ns
11t
su(SELV-HASL)
Setuptime,selectsignals
(3)
validbeforeHASlow5ns
12t
h(HASL-SELV)
Holdtime,selectsignals
(3)
validafterHASlow5ns
13t
w(HSTBL)
Pulseduration,HSTROBElow15ns
14t
w(HSTBH)
Pulseduration,HSTROBEhighbetweenconsecutiveaccesses2Mns
15t
su(SELV-HSTBL)
Setuptime,selectsignals
(3)
validbeforeHSTROBElow5ns
16t
h(HSTBL-SELV)
Holdtime,selectsignals
(3)
validafterHSTROBElow5ns
17t
su(HDV-HSTBH)
Setuptime,hostdatavalidbeforeHSTROBEhigh5ns
18t
h(HSTBH-HDV)
Holdtime,hostdatavalidafterHSTROBEhigh1ns
37t
su(HCSL-HSTBL)
Setuptime,HCSlowbeforeHSTROBElow0ns
Holdtime,HSTROBElowafterHRDYlow.HSTROBEshouldnotbe
38t
h(HRDYL-HSTBL)
inactivateduntilHRDYisactive(low);otherwise,HPIwriteswillnot1.1ns
completeproperly.
(1)HSTROBEreferstothefollowinglogicaloperationonHCS,HDS1,andHDS2:[NOT(HDS1XORHDS2)]ORHCS.
(2)M=SYSCLK3period=6/CPUclockfrequencyinns.Forexample,whenrunningpartsat1000MHz,useM=6ns.
(3)Selectsignalsinclude:HCNTL[1:0]andHR/W.ForHPI16modeonly,selectsignalsalsoincludeHHWIL.
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