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6.16.2 McBSP Electrical Data/Timing
The following assume testing over recommended operating conditions.
6.16.2.1
Multichannel Buffered Serial Port (McBSP) Timing
Table 6-57. Timing Requirements for McBSP0 [1.3V, 1.2V, 1.1V]
NO.
2
t
Cycle time, CLKR/X
c(CKRX)
3
t
Pulse duration, CLKR/X high or CLKR/X low
w(CKRX)
Setup time, external FSR high before CLKR
5
t
su(FRH-CKRL)
low
6
t
Hold time, external FSR high after CLKR low
h(CKRL-FRH)
7
t
Setup time, DR valid before CLKR low
su(DRV-CKRL)
8
t
Hold time, DR valid after CLKR low
h(CKRL-DRV)
Setup time, external FSX high before CLKX
10
t
su(FXH-CKXL)
low
11
t
Hold time, external FSX high after CLKX low
h(CKXL-FXH)
(1) CLKRP = CLKXP = FSRP = FSXP = 0. If polarity of any of the signals is inverted, then the timing references of that signal are also
inverted.
(2) P = ASYNC3 period in ns. For example, when the ASYNC clock domain is running at 100 MHz, use 10 ns.
(3) Use whichever value is greater. Minimum CLKR/X cycle times must be met, even when CLKR/X is generated by an internal clock
source. The minimum CLKR/X cycle times are based on internal logic speed; the maximum usable speed may be lower due to EDMA
limitations and AC timing requirements.
(4) This parameter applies to the maximum McBSP frequency. Operate serial clocks (CLKR/X) in the reasonable range of 40/60 duty cycle.
Copyright © 2010–2014, Texas Instruments Incorporated
CLKR/X ext
2P or 20
CLKR/X ext
CLKR int
CLKR ext
CLKR int
CLKR ext
CLKR int
CLKR ext
CLKR int
CLKR ext
CLKX int
CLKX ext
CLKX int
CLKX ext
Peripheral Information and Electrical Specifications
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AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
(1)
(see
Figure
1.3V, 1.2V
1.1V
MIN
MAX
MIN
(2) (3)
(2) (3)
2P or 25
(4)
(4)
P - 1
P - 1
14
15.5
4
5
6
6
3
3
14
15.5
4
5
3
3
3
3
14
15.5
4
5
6
6
3
3
AM1808
6-32)
UNIT
MAX
ns
ns
ns
ns
ns
ns
ns
ns
143
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