imx53 时钟dpll分析
2013-01-30 17:29
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DPLL reference clock
There are four DPLL's in i.MX53 project namely:
• DPLL-1 (typical functional frequency 800Mhz)
• DPLL-2 (typical functional frequency 400Mhz)
• DPLL-3 (typical functional frequency 216Mhz)
• DPLL-4 (typical functional frequency 595Mhz)
Each DPLL is controlled by a DPLLC-n interface block. Each DPLLC interface block
uses the output of on chip oscillator (typical frequency is 24Mhz) as DPLL reference
clock.
Reset Values for DPLLC
Reset values that are hard coded as DPLLC initialization values are:
DPLL1 - initial value =192Mhz
DPLL2 - initial value = 192Mhz
DPLL3 - initial value = 168Mhz
DPLL4 - initial value = 168Mhz
These frequencies correspond to the reference clock source of on chip oscillator (24
MHz) as the source for DPLL. For different frequencies, a linear ratio should be applied.
There are four DPLL's in i.MX53 project namely:
• DPLL-1 (typical functional frequency 800Mhz)
• DPLL-2 (typical functional frequency 400Mhz)
• DPLL-3 (typical functional frequency 216Mhz)
• DPLL-4 (typical functional frequency 595Mhz)
Each DPLL is controlled by a DPLLC-n interface block. Each DPLLC interface block
uses the output of on chip oscillator (typical frequency is 24Mhz) as DPLL reference
clock.
Reset Values for DPLLC
Reset values that are hard coded as DPLLC initialization values are:
DPLL1 - initial value =192Mhz
DPLL2 - initial value = 192Mhz
DPLL3 - initial value = 168Mhz
DPLL4 - initial value = 168Mhz
These frequencies correspond to the reference clock source of on chip oscillator (24
MHz) as the source for DPLL. For different frequencies, a linear ratio should be applied.
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