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TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
Table4-16.UHPIReadandWriteSwitchingCharacteristics
(1)(2)
NO.PARAMETERMINMAXUNIT
Case1.HPICorHPIAread115
Case2.HPIDreadwithno
9*2H+20
(3)
auto-increment
Case3.HPIDreadwith
1t
d(DSL-HDV)
Delaytime,DSlowtoHDvalidns
auto-incrementandreadFIFO9*2H+20
(3)
initiallyempty
Case4.HPIDreadwith
auto-incrementanddatapreviously115
prefetchedintothereadFIFO
2t
dis(DSH-HDV)
Disabletime,HDhigh-impedancefromDShigh14ns
3t
en(DSL-HDD)
Enabletime,HDdrivenfromDSlow315ns
4t
d(DSL-HRDYH)
Delaytime,DSlowtoUHPI_HRDYhigh12ns
5t
d(DSH-HRDYH)
Delaytime,DShightoUHPI_HRDYhigh12ns
Case1.HPIDreadwithno
10*2H+20
(3)
auto-increment
Delaytime,DSlowtoUHPI_HRDY
6t
d(DSL-HRDYL)
ns
Case2.HPIDreadwith
low
auto-incrementandreadFIFO10*2H+20
(3)
initialyempty
7t
d(HDV-HRDYL)
Delaytime,HDvalidtoUHPI_HRDYlow0ns
Case1.HPIAwrite5*2H+20
(3)
Delaytime,DShighto
Case2.HPIDreadwith
34t
d(DSH-HRDYL)
ns
UHPI_HRDYlow
auto-incrementandreadFIFO5*2H+20
(3)
initiallyempty
Delaytime,DSlowtoUHPI_HRDYlowforHPIAwriteandFIFOnot
35t
d(DSL-HRDYL)
40*2H+20
(3)
ns
empty
36t
d(HASL-HRDYH)
Delaytime,UHPI_HASlowtoUHPI_HRDYhigh12ns
(1)H=0.5*SYSCLK2period
(2)DSreferstoHSTROBE.HADreferstoUHPI_HCNTL[0],UHPI_HCNTL[1],UHPI_HHWIL,andUHPI_HRW.
(3)Maxdelayisabestcase,assumingnodelaysduetoresourceconflictsbetweenUHPIanddMAXorCPU.UHPI_HRDYshouldalways
beusedtoindicatewhenanaccessiscompleteinsteadofrelyingontheseparameters.
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