zoukankan      html  css  js  c++  java
  • S5PV210 时钟

    CLOCK DOMAINS 时钟域

    S5PV210 consists of three clock domains, namely, main system (MSYS), display system (DSYS), and peripheral system (PSYS)

    1

    时钟源
    外部焊接:

    1.XRTCXTI:实时时钟
    2.XXTI:CPU时钟
    3.XUSBXTI:USB时钟
    4.XHDMIXTI:HDMI时钟

    1

    CMU典型应用:

    1.MSYS clock domain uses APLL (that is, ARMCLK, HCLK_MSYS, and PCLK_MSYS)
    2.DSYS and PSYS clock domain (that is, HCLK_DSYS, HCLK_PSYS, PCLK_DSYS, and PCLK_PSYS) and other peripheral clocks (that is, audio IPs, SPI, and so on) use MPLL and EPLL
    3.Video clocks uses VPLL

    1

    时钟关系

    MSYS clock domain
    − freq(ARMCLK) = freq(MOUT_MSYS) / n, where n = 1 ~ 8
    − freq(HCLK_MSYS) = freq(ARMCLK) / n, where n = 1 ~ 8 //高速
    − freq(PCLK_MSYS) = freq(HCLK_MSYS) / n, where n = 1 ~ 8 //低速
    − freq(HCLK_IMEM) = freq(HCLK_MSYS) / 2 //内存
    • DSYS clock domain
    − freq(HCLK_DSYS) = freq(MOUT_DSYS) / n, where n = 1 ~ 16
    − freq(PCLK_DSYS) = freq(HCLK_DSYS) / n, where n = 1 ~ 8
    • PSYS clock domain
    − freq(HCLK_PSYS) = freq(MOUT_PSYS) / n, where n = 1 ~ 16
    − freq(PCLK_PSYS) = freq(HCLK_PSYS) / n, where n = 1 ~ 8
    − freq(SCLK_ONENAND) = freq(HCLK_PSYS) / n, where n = 1 ~ 8 //nand

    PLL 锁相环

    1.APLL can drive MSYS domain and DSYS domain
    2.MPLL can drive MSYS domain and DSYS domain
    3.EPLL is mainly used to generate audio clock
    4.VPLL is mainly used to generate video system operating clock

    CLK_SRC0, R/W, Address = 0xE010_0200
    PLL选择,通过设置相应的位
    1

    倍频
    以APLL举例

    APLL_CON0, R/W, Address = 0xE010_0100
    1

    FOUT = MDIV * FIN / (PDIV * 2^(SDIV-1))

    PDIV: 1 ≤ PDIV ≤ 63
    MDIV: 16 ≤ MDIV ≤ 1023
    SDIV: 0 ≤ SDIV ≤ 5

    常用参考值
    1

    倍频到1G
    输入频率,默认24M

    FOUT = 125 * 24 / (3 * 2^(1-1)) = 1000

  • 相关阅读:
    RocketMQ实战:生产环境中,autoCreateTopicEnable为什么不能设置为true
    x 的平方根--二分查找
    责任链模式--设计模式
    迭代器模式--设计模式
    组合模式--设计模式
    搜索旋转排序数组II
    搜索旋转排序数组--二分查找
    搜索插入位置--二分查找
    越狱详解与调试--逆向开发
    有序链表转换二叉搜索树--链表
  • 原文地址:https://www.cnblogs.com/zhangxuechao/p/11709528.html
Copyright © 2011-2022 走看看