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SSC_EN
SSC_FREQ
(rate)
SSC_SPREAD
(
)
deviation
t
f
1/f
m
D
f
-D
f
Spreading generation block
Clock generation
block
f
c
scm-035
Public Version
SCM Functional Description
www.ti.com
13.4.11.2.1 Clocking, Reset, and Power-Management Scheme
See
, Power, Reset, and Clock Management.
13.4.11.3 Functional Description
13.4.11.3.1 Spreading Generation Block
is a diagram of the spreading generation block. It shows three essential parameters
associated with spreading generation:
NOTE:
Δ
f is the deviation from the center frequency. The total spreading deviation is equal to twice
Δ
f.
f
c
is the original clock frequency.
f
m
is the spreading frequency.
Figure 13-20. Spreading Generation Block Diagram
This additional block generates the required waveform used to reduce EMI. This waveform is then
modulated with the initial signal to add some controlled deviation in the clock signal frequency, which
spreads the energy of the clock and its harmonics into a band of frequencies, and then reduces the
electromagnetic interferences.
In any case, the frequency modulation is programmed in the SCM and does not generally need to be
changed in real time.
2524
System Control Module
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...