參數(shù)資料
型號(hào)： TMS320C6701GJC100
廠商： Texas Instruments, Inc.
元件分類(lèi)： 數(shù)字信號(hào)處理
英文描述： FIXED-POINT DIGITAL SIGNAL PROCESSOR
中文描述： 定點(diǎn)數(shù)字信號(hào)處理器
文件頁(yè)數(shù)： 26/70頁(yè)
文件大?。?/td> 1050K
代理商： TMS320C6701GJC100
TMS320C6205
FIXED-POINT DIGITAL SIGNAL PROCESSOR
SPRS106E
OCTOBER 1999
REVISED MARCH 2004
26
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251
1443
clock PLL
Most of the internal C6205 clocks are generated from a single source through the CLKIN pin. This source clock
either drives the PLL, which multiplies the source clock in frequency to generate the internal CPU clock, or
bypasses the PLL to become the internal CPU clock.
To use the PLL to generate the CPU clock, the external PLL filter circuit must be properly designed. Figure 5,
Table 3, and Table 4 show the external PLL circuitry for either x1 (PLL bypass) or x4 PLL multiply modes.
Figure 6 shows the external PLL circuitry for a system with ONLY x1 (PLL bypass) mode.
To minimize the clock jitter, a single clean power supply should power both the C6205 device and the external
clock oscillator circuit. Noise coupling into PLLF directly impacts PLL clock jitter. The minimum CLKIN rise and
fall times should also be observed. For the input clock timing requirements, see the
input and output clocks
electricals section.
ED[31,27,23]
(see Table 3)
PLL
PLLV
CLKIN
LOOP FILTER
PLLCLK
PLLMULT
CLKIN
P
C2
Internal to C6205
CPU
CLOCK
C1
R1
3.3V
10 F
0.1 F
P
E
C3
C4
1
0
CLKMODE0
(see Table 3)
NOTES: A. Keep the lead length and the number of vias between pin PLLF, pin PLLG, R1, C1, and C2 to a minimum. In addition, place all PLL
components (R1, C1, C2, C3, C4, and EMI Filter) as close to the C6000
DSP device as possible. Best performance is achieved
with the PLL components on a single side of the board without jumpers, switches, or components other than the ones shown.
B. For reduced PLL jitter, maximize the spacing between switching signals and the PLL external components (R1, C1, C2, C3, C4,
and the EMI Filter).
C. 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
.
D. EMI filter manufacturer: TDK part number ACF451832-333, 223, 153, 103. Panasonic part number EXCCET103U.
E. At power up, the PLL requires a falling edge of RESET to initialize the PLL engine. It may be necessary to toggle reset in order to
establish proper PLL operation.
Figure 5. External PLL Circuitry for Either PLL Multiply Modes or x1 (Bypass) Mode
PLL
PLLV
CLKIN
LOOP FILTER
PLLCLK
PLLMULT
CLKIN
P
Internal to C6205
CPU
CLOCK
P
1
0
3.3V
CLKMODE0
NOTES: A. For a system with ONLY PLL x1 (bypass) mode, short the PLLF to PLLG.
B. The 3.3-V supply for PLLV must be from the same 3.3-V power plane supplying the I/O voltage, DV
DD
.
Figure 6. External PLL Circuitry for x1 (Bypass) PLL Mode Only
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