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Rev. C|Page 38 of 88|March 2012 表32. 时钟和复位时序参数最

Specifications
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Content	Rev. C\|Page 38 of 88\|March 2012 表32. 时钟和复位时序参数最小值最大值单位时序要求 fCKINCLKIN频率(商用/工业型号)1, 2, 3, 4zHM0521 CLKIN频率(汽车应用型号)1, 2, 3, 4zHM0541 tCKINLCLKIN低电平脉冲110ns tCKINHCLKIN高电平脉冲110ns tWRSTRESET 置位低电平脉冲宽度511 × tCKINns 开关特性 tBUFDLAYCLKIN至CLKBUF延迟10ns 图9. 时钟和复位时序 CLKIN tWRST tCKIN tCKINLtCKINHtBUFDLAY tBUFDLAY CLKBUF ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527 时序规格规格如有变更恕不另行通知。时钟和复位时序表32和图9描述时钟和复位操作。根据表12至表17中的 CCLK和SCLK时序规格，CLKIN与时钟乘法器的组合不得选择超过处理器最大指令速率的内核/外设时钟。 1 适用于PLL旁路模式和PLL非旁路模式。 2 CLKIN频率与PLL时钟乘法器的组合不得超过第28页的表12至表14和第30页的表15至表17所示fVCO、fCCLK和fSCLK的容许设置。 3 tCKIN周期(见图9)等于1/fCKIN。 4 如果PLL_CTL寄存器的DF位设为1，则商用/工业用型号的fCKIN最小值规定为24 MHz，汽车应用型号为28 MHz。 5 上电序列完成之后应用。上电复位时序参见表33和图10。
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