Preliminary
Device Clocking and Flying Adder PLL
www.ti.com
lists the IPs that are clocked from Audio PLL flying adder synthesizers.
Table 1-81. Audio PLL Clocks
SD/SDIO
SYSCLK18
De-bounce Clock
AUDIOPLL
32.768 KHz
TIMER
SYSCLK18
Functional Clock
AUDIOPLL
32.768 KHz
Watch Dog Timer
SYSCLK18
Functional Clock
AUDIOPLL
32.768KHz
RTC
SYSCLK18
Functional Clock
AUDIOPLL
32.768KHz
McASP, McBSP
SYSCLK20
Functional Clock
AUDIOPLL
196 MHz
SYSCLK21
Functional Clock
AUDIOPLL
196 MHz
SYSCLK22
Functional Clock
AUDIOPLL
196 MHz
shows an example for Audio PLL System Clock generation.
Table 1-82. Example for Audio PLL Frequencies
VCO Output
4
24
FAPLL
Post Divider
Post Divider
PRCM Divider System Clock
SYSCLK
Frequency
Bits
Bits
Output
Output
Domain
Frequency
Integ
Fract
(MHz)
er
ional
f
vco
(MHz)
FREQ
f
s
(MHz)
M
f
o
(MHz)
1105.92
14
0
631.95428571
4
157.98857142
1
SYSCLK19
157.98857142
4286
8571
8571
1105.92
9
0
983.04
5
196.608
1
SYSCLK20
196.608
1105.92
9
0.795
903.16969344
20
45.158484672
1
SYSCLK21
45.158484672
9
3175
1588
1588
1105.92
13
0.5
655.36
20
32.768
1
SYSCLK22
32.768
1105.92
13
0.824
640
4
160
1
SYSCLK19
160
1105.92
11
0.988
738.01801801
5
147.60360360
1
SYSCLK20
147.60360360
8018
3604
3604
1105.92
13
0.5
655.36
20
32.768
1
SYSCLK21
32.768
1105.92
9
0.796
903.16047366
20
45.158023683
1
SYSCLK22
45.158023683
272
136
136
1.10.3.1.5 Steps for Changing Main PLL Frequency
Refer to the appropriate subsection on how to program the MAINPLL clocks:
•
If the MAINPLL is powered down(MAIN_PLLEN bit in MAINPLL_CTRL is cleared to 0), follow the full
PLL initialization procedure in ....to initialize the MAINPLL
•
If the MAINPLL is not powered down(MAIN_PLLEN bit in MAINPLL_CTRL is set to 1), follow the
sequence in ....to initialize the MAINPLL multiplier
•
If the MAINPLL is already running at a desired frequency and you only want to change the SYSCLK
FREQ and post dividers follow the seqeunce in .....
Note that the MAILPLL is powered down after the following device-level global resets:
•
Power-on Reset (POR)
•
Warm Reset (RESET)
•
Max Reset
196
Chip Level Resources
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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