Flying adder
synthesizer 1
Flying adder
synthesizer 2
Flying adder
synthesizer 3
FREQ_1
FREQ_2
FREQ_3
Video pll clock 1
27 MHz
Video pll clock 2
27 MHz
Video pll clock 3
27 MHz
SYSCLK11
SYSCLK17 (SD clk [54 MHz])
SYSCLK16 (To STC1)
MUX0
SYSCLK13 (HD_VENC_D_CLK
[max 165 MHz])
SYSCLK14 (To STC0)
SYSCLK15 (HD_VENC_A_CLK
[max 165 MHz])
27 MHz
clock
27 MHz
clock
27 MHz
clock
MUX1
/A
/D1
B1
B3
/C1
/C2
/4
0
1
2
1
0
27 MHz
/P
PFD
CP
VCO
/N
CLKIN
Logic in PRCM
Preliminary
www.ti.com
Device Clocking and Flying Adder PLL
1.10.3.1.3 Video PLL
shows the Video PLL structure. There are 4 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 provides the SYSCLK17 (VENC SD clock) to HDVPSS; this clock is always 54 MHz.
The second one provides SYSCLK13 (HD_VENC_D_CLK) for the display subsystem. HD_VENC_D_CLK
needs to support 13.5 MHz, 27 MHz, 54 MHz, 74.25 MHz, 148.5 MHz, and 161 MHz frequencies. The
third flying adder synthesizer supplies SYSCLK15 (HD_VENC_A_CLK). This clock has similar frequency
requirements as HD_VENC_D_CLK.
This devices uses on-chip DCXO using the FA-PLL. Flying adder synthesizer 1, 2, and 3 will be used for
this. Software will control the FREQ_1, FREQ_2 and FREQ_3 to track the frequency.
Figure 1-71. Video PLL Structure
Mux0 and Mux1 selects will default to 0.
shows the supported divide ratios in PRCM module for all dividers in the Video PLL.
Table 1-77. Video PLL Dividers
Divider
Supported Divide Ratios
Default Values
A
1/1, 1/2
1/1
D1
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/8
B1
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/8
B3
1/1,1/2, 1/22
1/22
C1
1/1,1/2, 1/22
1/22
C2
1/1,1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8
1/4
193
SPRUGX9 – 15 April 2011
Chip Level Resources
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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