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EM_D[31:16]/UHPI_HA[15:0]
UHPI_HCNTL[1:0]
UHPI_HD[15:0]
UHPI_HD[16]/HHWIL
UHPI_HD[31:17]
UHPI_HAS
(B)
UHPI_HBE[3:0]
UHPI_HRW
UHPI_HDS[2]
UHPI_HDS[1]
UHPI_HCS
UHPI_HRDY
AMUTE2/HINT
A[x:y]
(A)
D[15:0]
D[16]
BE[3:0]
(C)
R/W
WE
(D)
RD
(D)
CS
RDY
INTERRUPT
DSP External Host MCU
D[31:17]
A[17:2]
TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
Figure4-17illustratestheNon-MultiplexedHostAddress/DataFullwordmodeoftheUHPI.Inthismode,
theUHPIbehavesalmostlikeanasynchronousSRAMexceptitassertstheUHPI_HRDYsignal.This
modeallowsthehosttorandomlyaccessa64K-bytepageintheC672xaddressspace.Theupper32bits
oftheC672xaddressaresetbytheDSP(only)throughtheCFGHPIAMSBandCFGHPIAUMBregisters
(seeTable4-13andTable4-14).
A.TwohostaddresslinesorhostGPIOifaddresslinesarenotavailable.
B.Notusedinthismode.
C.ByteEnables(activeduringreadsandwrites).Someprocessorssupportabyte-enablemodeontheirwriteenable
pins.
D.Onlyrequiredifneededforstrobetiming.NotrequiredifCSmeetsstrobetimingrequirements.
Figure4-17.UHPINon-MultiplexedHostAddress/DataFullwordMode
CAUTION
TheEMIFdatabusandUHPIHAinputssharetheEM_D[31:16]/UHPI_HA[15:0]pins.
WhenusingNon-Multiplexedmode,makesuretheEMIFdoesnotdriveEM_D[31:16];
otherwise,adriveconflictwiththeexternalhostMCUmayresult.Normally,theEMIF
willbegintodrivetheEM_D[31:16]linesimmediatelyafteritcompletestheSDRAM
initializationsequence,whichoccursautomaticallyafterRESETisreleased.Toavoid
adriveconflictthen,thebootsoftwaremustsetCFGHPI.NMUXto'1'beforetheEMIF
drivesEM_D[31:16].SettingCFGHPI.NMUXto'1'forcesthesepinstobeinputpins.
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