Flying-adder
synthesizer
FREQ
/M
fs
fo
K
VCO
C.P.
PFD
/P
fr
fp
/N
fvco
Preliminary
www.ti.com
Device Clocking and Flying Adder PLL
1.10.3 Flying Adder PLL
The device uses Flying Adder PLLs for all on-chip PLLs.
shows basic structure of the Flying
Adder PLL.
Figure 1-68. Flying Adder PLL
Flying Adder PLL (FAPLL) has two main components:
1. Multiphase PLL
2. Flying Adder Synthesizer.
The multiphase PLL takes input reference clock (f
r
), mutliplies it with factor N and provides a K phase
output to the flying adder synthesizer. The flying adder synthesizer takes this multi phase clock input and
produces a variable frequency clock (f
s
). There is post divider on this clock that takes in clock f
s
and drives
out clock f
o
.
The f
vco
frequency of the PLL is given by
f
vco
= (N/P) x f
r
The f
s
frequency of the FAPLL is givey by
f
s
= (
fvco
x K)/FREQ
The f
o
frequency of the Post divider is given by
f
o
= f
s
/M
Where:
f
vco
= VCO frequency. Range is 800-1850 MHz.
f
r
= Input reference frequency
N = Multiplier
P = Pre-divider
K = Phase Output. 8 is the value for this device
f
s
= FAPLL output
f
o
= Post Divider output
FREQ = 4 bits integer and 24 bits of fractional value
M = Post Divider. Value ranges from 1 to 255.
There can be multiple flying adder synthesizers attached to one multi phase PLL to generate different
frequencies. FREQ and M values can be adjusted for each clock separately based on the frequency
needed.
1.10.3.1 PLL Types
This device has 4 on-chip PLLs and they are as follows:
1. MAIN PLL
2. DDR PLL
3. VIDEO PLL
187
SPRUGX9 – 15 April 2011
Chip Level Resources
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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