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4.13.2McASPElectricalData/Timing
TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
4.13.2.1MultichannelAudioSerialPort(McASP)Timing
Table4-22andTable4-23assumetestingoverrecommendedoperatingconditions(seeFigure4-29and
Figure4-30).
Table4-22.McASPTimingRequirements
(1)(2)
NO.MINMAXUNIT
Cycletime,AHCLKRexternal,AHCLKRinput20
1t
c(AHCKRX)
ns
Cycletime,AHCLKXexternal,AHCLKXinput20
Pulseduration,AHCLKRexternal,AHCLKRinput7.5
2t
w(AHCKRX)
ns
Pulseduration,AHCLKXexternal,AHCLKXinput7.5
Cycletime,ACLKRexternal,ACLKRinputgreaterof2Por20ns
3t
c(ACKRX)
ns
Cycletime,ACLKXexternal,ACLKXinputgreaterof2Por20ns
Pulseduration,ACLKRexternal,ACLKRinput10
4t
w(ACKRX)
ns
Pulseduration,ACLKXexternal,ACLKXinput10
Setuptime,AFSRinputtoACLKRinternal8
Setuptime,AFSXinputtoACLKXinternal8
Setuptime,AFSRinputtoACLKRexternalinput3
5t
su(AFRXC-ACKRX)
ns
Setuptime,AFSXinputtoACLKXexternalinput3
Setuptime,AFSRinputtoACLKRexternaloutput3
Setuptime,AFSXinputtoACLKXexternaloutput3
Holdtime,AFSRinputafterACLKRinternal0
Holdtime,AFSXinputafterACLKXinternal0
Holdtime,AFSRinputafterACLKRexternalinput3
6t
h(ACKRX-AFRX)
ns
Holdtime,AFSXinputafterACLKXexternalinput3
Holdtime,AFSRinputafterACLKRexternaloutput3
Holdtime,AFSXinputafterACLKXexternaloutput3
Setuptime,AXRninputtoACLKRinternal8
7t
su(AXR-ACKRX)
Setuptime,AXRninputtoACLKRexternalinput3ns
Setuptime,AXRninputtoACLKRexternaloutput3
Holdtime,AXRninputafterACLKRinternal3
8t
h(ACKRX-AXR)
Holdtime,AXRninputafterACLKRexternalinput3ns
Holdtime,AXRninputafterACLKRexternaloutput3
(1)ACLKXinternal–ACLKXCTL.CLKXM=1,PDIR.ACLKX=1
ACLKXexternalinput–ACLKXCTL.CLKXM=0,PDIR.ACLKX=0
ACLKXexternaloutput–ACLKXCTL.CLKXM=0,PDIR.ACLKX=1
ACLKRinternal–ACLKRCTL.CLKRM=1,PDIR.ACLKR=1
ACLKRexternalinput–ACLKRCTL.CLKRM=0,PDIR.ACLKR=0
ACLKRexternaloutput–ACLKRCTL.CLKRM=0,PDIR.ACLKR=1
(2)P=SYSCLK2period
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