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    Zero latency prefetching in caches
    1.
    发明授权
    Zero latency prefetching in caches 有权

    公开(公告)号：US12197334B2

    公开(公告)日：2025-01-14

    申请号：US17940070

    申请日：2022-09-08

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Oluleye Olorode ,  Ramakrishnan Venkatasubramanian ,  Hung Ong

    IPC: G06F12/0862 ,  G06F9/30 ,  G06F9/38 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/0875 ,  G06F12/0888 ,  G06F12/1027

    Abstract: This invention involves a cache system in a digital data processing apparatus including: a central processing unit core; a level one instruction cache; and a level two cache. The cache lines in the second level cache are twice the size of the cache lines in the first level instruction cache. The central processing unit core requests additional program instructions when needed via a request address. Upon a miss in the level one instruction cache that causes a hit in the upper half of a level two cache line, the level two cache supplies the upper half level cache line to the level one instruction cache. On a following level two cache memory cycle, the level two cache supplies the lower half of the cache line to the level one instruction cache. This cache technique thus prefetches the lower half level two cache line employing fewer resources than an ordinary prefetch.

    Integer and half clock step division digital variable clock divider
    8.
    发明授权
    Integer and half clock step division digital variable clock divider 有权
    整数和半时钟分频数字可变时钟分频器

    公开(公告)号：US08598932B2

    公开(公告)日：2013-12-03

    申请号：US13888050

    申请日：2013-05-06

    Applicant: Texas Instruments Incorporated

    Inventor： Ramakrishnan Venkatasubramanian ,  Anthony Lell ,  Raguram Damodaran

    IPC: G06F1/04 ,  H03K21/00

    CPC classification number: G06F12/1081 ,  G06F1/3296 ,  G06F7/483 ,  G06F9/3012 ,  G06F11/1064 ,  G06F12/0246 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/12 ,  G06F13/1605 ,  G06F13/1652 ,  G06F13/1657 ,  G06F13/1663 ,  G06F13/18 ,  G06F13/364 ,  G06F2212/1021 ,  G06F2212/1032 ,  G06F2212/221 ,  G06F2212/2532 ,  G06F2212/283 ,  G06F2212/608 ,  H03K19/0016 ,  H03K21/00 ,  H03M13/2903 ,  H03M13/353 ,  Y02D10/124 ,  Y02D10/172 ,  Y02D50/20

    Abstract: A clock divider is provided that is configured to divide a high speed input clock signal by an odd, even or fractional divide ratio. The input clock may have a clock cycle frequency of 1 GHz or higher, for example. The input clock signal is divided to produce an output clock signal by first receiving a divide factor value F representative of a divide ratio N, wherein the N may be an odd or an even integer. A fractional indicator indicates the divide ratio is N.5 when the fractional indicator is one and indicates the divide ratio is N when the fractional indicator is zero. F is set to 2(N.5)/2 for a fractional divide ratio and F is set to N/2 for an integer divide ratio. A count indicator is asserted every N/2 input clock cycles when N is even. The count indicator is asserted alternately N/2 input clock cycles and then 1+N/2 input clock cycles when N is odd. One period of an output clock signal is synthesized in response to each assertion of the count indicator when the fractional indicator indicates the divide ratio is N.5. One period of the output clock signal is synthesized in response to two assertions of the count indicator when the fractional indicator indicates the divide ratio is an integer.

    Abstract translation: 提供了一个时钟分频器，其配置为将高速输入时钟信号除以奇数，偶数或分数分频比。 例如，输入时钟可以具有1GHz或更高的时钟周期频率。 输入时钟信号被分割以产生输出时钟信号，首先接收表示分频比N的除法因子值F，其中N可以是奇数或偶数整数。 分数指示符表示分数指示符为1时的分频比为N.5，当分数指示符为零时表示分频比为N。 对于分数除数，F被设置为2（N.5）/ 2，并且对于整数分频比，F被设置为N / 2。 当N为偶数时，每N / 2个输入时钟周期，计数指示器被置位。 当N为奇数时，计数指示灯交替显示N / 2个输入时钟周期，然后1 + N / 2个输入时钟周期。 当分数指示符表示分频比为N.5时，响应于计数指示符的每个断言，合成输出时钟信号的一个周期。 当分数指示符表示分频比是整数时，响应于计数指示符的两个断言，合成输出时钟信号的一个周期。

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