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    • 22. 发明授权
    • Method and apparatus for performing single-cycle addition or subtraction and comparison in redundant form arithmetic
    • 用于在冗余形式算术中执行单周期加法或减法和比较的方法和装置
    • US07395304B2
    • 2008-07-01
    • US10890848
    • 2004-07-13
    • Bharat BhushanVinod SharmaEdward GrochowskiJohn Crawford
    • Bharat BhushanVinod SharmaEdward GrochowskiJohn Crawford
    • G06F7/04
    • G06F7/5095G06F7/02G06F7/4824
    • A method and apparatus is disclosed that uses an arithmetic circuit for adding numbers represented in a redundant form to also subtract numbers received in redundant form, including numbers received from a bypass circuit. A non-propagative comparator circuit is then used to compare a given value with a result from the arithmetic circuit to determine if the result is equal to the given value. All of the operations described above can be accomplished without propagating carry signals throughout the circuitry.The method includes generating a complemented redundant form of at least one number supplied to the arithmetic circuit in redundant form. It also includes providing adjustment input to the arithmetic circuit to augment a result produced through the arithmetic circuit. This adjustment causes the arithmetic circuit to generate a valid outcome in redundant form as a result of a subtraction operation if the arithmetic operation is subtraction. Then the result is compared to a given value using a non-propagative comparator to determine equality or inequality of the result to the given value.
    • 公开了一种方法和装置,其使用运算电路来添加以冗余形式表示的数字,还可以减去以冗余形式接收的数字,包括从旁路电路接收的数字。 然后使用非传播比较器电路将给定值与运算电路的结果进行比较,以确定结果是否等于给定值。 可以在整个电路中不传播进位信号来实现上述所有操作。 该方法包括以冗余的形式生成提供给运算电路的至少一个数的补码冗余形式。 它还包括向算术电路提供调整输入以增加通过运算电路产生的结果。 如果算术运算是减法,则该调整使得运算电路作为减法运算的结果以冗余形式产生有效结果。 然后将结果与使用非传播比较器的给定值进行比较,以确定结果与给定值的相等或不等式。
    • 29. 发明授权
    • Circuit and method for protecting 1-hot and 2-hot vector tags in high performance microprocessors
    • 用于保护高性能微处理器中的1-hot和2-hot矢量标签的电路和方法
    • US06839814B2
    • 2005-01-04
    • US10726492
    • 2003-12-04
    • Nhon QuachJohn CrawfordGreg S. MathewsEdward GrochowskiChakravarthy Kosaraju
    • Nhon QuachJohn CrawfordGreg S. MathewsEdward GrochowskiChakravarthy Kosaraju
    • G06F12/08G06F12/00
    • G06F12/0891
    • The present invention relates to the design of highly reliable high performance microprocessors, and more specifically to designs that use cache memory protection schemes such as, for example, a 1-hot plus valid bit scheme and a 2-hot vector cache scheme. These protection schemes protect the 1-hot vectors used in the tag array in the cache and are designed to provide hardware savings, operate at higher speeds and be simple to implement. In accordance with an embodiment of the present invention, a tag array memory including an input conversion circuit to receive a 1-hot vector and to convert the 1-hot vector to a 2-hot vector. The tag array memory also including a memory array coupled to the input conversion circuit, the memory array to store the 2-hot vector; and an output conversion circuit coupled to the memory array, the output conversion circuit to receive the 2-hot vector and to convert the 2-hot vector back to the 1-hot vector.
    • 本发明涉及高度可靠的高性能微处理器的设计,更具体地说涉及使用高速缓存存储器保护方案(例如,1加热有效位方案和2热向量高速缓存方案)的设计。 这些保护方案保护缓存中标签阵列中使用的1-hot向量,并设计为提供硬件节省,以更高的速度运行并且易于实现。 根据本发明的一个实施例,一种标签阵列存储器,包括一个输入转换电路,用于接收1个热矢量,并将该1个热矢量转换为2个热矢量。 标签阵列存储器还包括耦合到输入转换电路的存储器阵列,存储器阵列以存储2-热矢量; 以及耦合到存储器阵列的输出转换电路,所述输出转换电路接收所述2-热矢量并将所述2-热矢量转换回所述1-热矢量。