Flying adder
synthesizer 3
Flying adder
synthesizer 2
FREQ_3
FREQ_2
Logic inside PRCM
SYSCLK8 (400 MHZ max)
SYSCLK9 (CEC clock)
SYSCLK10 (SPI, I2C, SD,
and UART functional clocks
[48 MHz])
/A
/C
/B
DDR pll clock 3
DDR pll clock 2
DDR clock
(800 MHZ max)
/2
/2
400 MHZ clock
IDID
DMM
VCO
CP
PFD
/P
27 MHz
SYSCLK8
(OCP clock)
27 MHz
27 MHz
/N
Data enable
DDR2/3
controller
RCD
Preliminary
www.ti.com
Device Clocking and Flying Adder PLL
Figure 1-70. DDR PLL Structure
A good set of frequencies for DDR2/3 can be generated by playing with FREQ and post divider values.
shows supported divide ratios in PRCM for dividers.
Table 1-74. DDR PLL Dividers
Divider
Supported Divide Ratio
Default Value
A
1/1
1/1
B
1/1, 1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/2
C
1/3
1/3
191
SPRUGX9 – 15 April 2011
Chip Level Resources
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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