Texas Instruments AM1808 - Page 138

AM1808
SPRS653E –FEBRUARY 2010–REVISED MARCH 2014 www.ti.com
Table 6-53. Timing Requirements for McASP0 (1.0V)
(1)(2)
1.0V
NO. UNIT
MIN MAX
1 t
c(AHCLKRX)
Cycle time, AHCLKR/X 35 ns
2 t
w(AHCLKRX)
Pulse duration, AHCLKR/X high or low 17.5 ns
3 t
c(ACLKRX)
Cycle time, ACLKR/X AHCLKR/X ext 35
(3)
ns
4 t
w(ACLKRX)
Pulse duration, ACLKR/W high or low AHCLKR/X ext 17.5 ns
AHCLKR/X int 16 ns
Setup time,
5 t
su(AFSRX-ACLKRX)
AHCLKR/X ext input 5.5 ns
AFSR/X input to ACLKR/X
(4)
AHCLKR/X ext output 5.5 ns
AHCLKR/X int -2 ns
Hold time,
6 t
h(ACLKRX-AFSRX)
AHCLKR/X ext input 1 ns
AFSR/X input after ACLKR/X
(4)
AHCLKR/X ext output 1 ns
AHCLKR/X int 16 ns
Setup time,
7 t
su(AXR-ACLKRX)
AXR0[n] input to ACLKR/X
(4)(5)
AHCLKR/X ext 5.5 ns
AHCLKR/X int -2 ns
Hold time,
8 t
h(ACLKRX-AXR)
AHCLKR/X ext input 5 ns
AXR0[n] input after ACLKR/X
(4)(5)
AHCLKR/X ext output 5 ns
(1) ACLKX0 internal – McASP0 ACLKXCTL.CLKXM = 1, PDIR.ACLKX = 1
ACLKX0 external input – McASP0 ACLKXCTL.CLKXM = 0, PDIR.ACLKX = 0
ACLKX0 external output – McASP0 ACLKXCTL.CLKXM = 0, PDIR.ACLKX = 1
ACLKR0 internal – McASP0 ACLKRCTL.CLKRM = 1, PDIR.ACLKR =1
ACLKR0 external input – McASP0 ACLKRCTL.CLKRM = 0, PDIR.ACLKR = 0
ACLKR0 external output – McASP0 ACLKRCTL.CLKRM = 0, PDIR.ACLKR = 1
(2) P = SYSCLK2 period
(3) This timing is limited by the timing shown or 2P, whichever is greater.
(4) McASP0 ACLKXCTL.ASYNC=1: Receiver is clocked by its own ACLKR0
(5) McASP0 ACLKXCTL.ASYNC=0: Receiver is clocked by transmitter's ACLKX0
138 Peripheral Information and Electrical Specifications Copyright © 2010–2014, Texas Instruments Incorporated
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