SM320C6713-EP_15 Datasheet, PDF (68/133 Pages) Texas Instruments – FLOATING-POINT DIGITAL SIGNAL PROCESSORS

SM320C6713-EP
SM320C6713B-EP
SGUS049K – AUGUST 2003 – REVISED APRIL 2011
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8 PLL and PLL Controller
The 320C6713/13B includes a PLL and a flexible PLL controller peripheral consisting of a prescaler (D0)
and four dividers (OSCDIV1, D1, D2, and D3). The PLL controller is able to generate different clocks for
different parts of the system (that is, DSP core, peripheral data bus, external memory interface, McASP,
and other peripherals). Figure 8-1 shows the PLL, the PLL controller, and the clock generator logic.
+3.3 V
EMI filter
C1 C2
10 mF0 .1 mF
PLLHV
For Use
in System
CLKMODE0
CLKIN
PLLREF
PLLOUT
DIVIDER D0
PLLEN (PLL_CSR.[0])
1
Reserved
0
/1, /2,
..., /32
ENA
PLL
x4 to x25 1
0
(A)
DIVIDER D1
/1, /2,
..., /32
SYSCLK1
(DSP Core)
D1EN (PLLDIV1.[15])
ENA
D0EN (PLLDIV0.[15])
DIVIDER D2^(A)
CLKOUT3
OSCDIV1
/1, /2,
..., /32
ENA
OD1EN (OSCDIV1.[15])
D2EN (PLLDIV2.[15])
AUXCLK
(Internal Clock Source
to McASP0 and McASP1)
D3EN (PLLDIV3.[15])
/1, /2,
..., /32
ENA
SYSCLK2
(Peripherals)
DIVIDER D3
/1, /2,
..., /32
ENA
SYSCLK3
ECLKIN
(EMIF Clock Input)
1 0 EKSRC Bit
(DEVCFG.[4])
C6713/13B DSPs
EMIF
ECLKOUT
A. Dividers D1 and D2 must never be disabled. Never write a '0' to the D1EN or D2EN bits in the PLLDIV1 and PLLDIV2
registers.
B. Place all PLL external components (C1, C2, and the EMI filter) as close to the C67x DSP device as possible. For the
best performance, TI recommends that all the PLL external components be on a single side of the board without
jumpers, switches, or components other than the ones shown.
C. For reduced PLL jitter, maximize the spacing between switching signals and the PLL external components (C1, C2,
and the EMI filter).
D. The 3.3-V supply for the EMI filter must be from the same 3.3-V power plane supplying the I/O voltage, DV_DD.
E. EMI filter manufacturer TDK part number ACF451832-333, -223, -153, -103. Panasonic part number EXCCET103U.
Figure 8-1. PLL and Clock Generator Logic
68
PLL and PLL Controller
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