Logic inside
control module
Flying adder
synthesizer 1
Flying adder
synthesizer 2
Flying adder
synthesizer 3
Flying adder
synthesizer 4
Flying adder
synthesizer 5
Audio pll clock 1
27 MHz clock
Audio pll clock 2
27 MHz clock
Audio pll clock 3
27 MHz clock
Audio pll clock 4
27 MHz clock
Audio pll clock 5
27 MHz clock
/A
/B
/C
/D
/E
MUX2
Clock to RTC
SYSCLK19
Logic inside PRCM
SYSCLK20 (Audio clk1)
SYSCLK21 (Audio clk2)
SYSCLK22 (Audio clk3)
FREQ_1
FREQ_2
FREQ_3
FREQ_4
FREQ_5
27 MHz clock
432 MHz
/P
PFD
/N
CP
VCO
32768 Hz external clock
SYSCLK18 (32768 Hz)
0
1
Preliminary
www.ti.com
Device Clocking and Flying Adder PLL
1.10.3.1.4 Audio PLL
shows the structure of the Audio PLL. The Audio PLL has 5 flying adder synthesizers. The
outputs of these synthesizers are muxed with the 27 MHz reference clock to allow its selection during PLL
bypass mode. The first synthesizer uses the 27 MHz reference clock as a source and provides a 32.768
KHz clock (SYSCLK18) for the SD/SDIO peripheral. A 32.678 KHz clock for the RTC is sourced from the
Control Module. This clock has two sources, SYSCLK18 and the 32768 Hz clock from the primary input
pin. The Mux2 select defaults to 0 which selects clock generated from FA synthesizer. This clock is also
supplied to the watchdog timer. The DMTIMERS (1-7) have the following muxing for the input clock.
Select for this mux will default to 1.
shows the connection of audio clocks to McASP, McBSP, and HDMI modules. The default
select value for these muxes is “0x0” which selects SYSCLK20.
Figure 1-72. Audio PLL Structure
shows the supported divide ratios in PRCM module for all dividers in the Audio PLL.
Table 1-80. Audio PLL Dividers
Divider
Supported Divider Ratios
Default Value
A
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/1
B
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/1
C
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/1
D
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/1
E
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/1
195
SPRUGX9 – 15 April 2011
Chip Level Resources
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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