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5.67PortResponseTime-OutControlCSR(SP_RT_CTL)
SRIORegisters
Theportresponsetime-outcontrolCSR(SP_RT_CTL)isshowninFigure130anddescribedinTable138
Foradditionalprogramminginformation,seeSection2.3.3.3andSection2.3.3.
Figure130.PortResponseTime-OutControlCSR(SP_RT_CTL)-AddressOffset1124h
31
TIMEOUT_VALUE
RW-FFFFFFh
870
TIMEOUT_VALUEReserved
RW-FFFFFFhR-00h
LEGEND:R/W=Read/Write;R=Readonly;-n=Valueafterreset
Table138.PortResponseTime-OutControlCSR(SP_RT_CTL)FieldDescriptions
BitFieldValueDescription
31–8TIMEOUT_VALUE000000hTimeoutvalueforallportsonthedevice.Thistimeoutisforsendingapacketto
toreceivingthecorrespondingresponsepacket.Maxvaluerepresents3to6
FFFFFFhseconds.Thetimeoutdurationcanbeexpressedas:
Timeout=15x((PrescaleValue+1)xDMAClockPeriodxTimeoutValue)
wherePrescalevalueissetinPER_SET_CNTL(offset0020h)andtheTimeout
valueisthedecimalrepresentationofthisregistervalue.Forexample,givena
400-MHzDMA,aPrescaleValueof4,andaTimeoutValueofFFFFFFh,the
Timeoutdurationwouldbe:
Timeout=15x((4+1)x2.5nsx16777216)=3.15s
7–0Reserved00hTheseread-onlybitsreturn0swhenread.
SerialRapidIO(SRIO) 198SPRUE13A–September2006
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