公开(公告)号：US06574651B1

公开(公告)日：2003-06-03

申请号：US09411620

申请日：1999-10-01

申请人： Jeffrey Cui ,  Stephane Rossignol ,  Lew G. Chua-Eoan

发明人： Jeffrey Cui ,  Stephane Rossignol ,  Lew G. Chua-Eoan

IPC分类号： G06F738

CPC分类号： G06F7/5324 ,  G06F7/4991 ,  G06F7/49921

摘要： A method of multiplying 32-bit values includes decomposing each multiplicand into its 16-bit components. This approach leads to a processor core design which permits re-use of much of the logic in the multiplication unit. The multiplication unit includes a selector which can feed various-sized data formats to the same multiplier circuits. Multiple data transformation paths are provided and feed into a single compression circuit and a single configurable full adder circuit.

摘要翻译： 32位值相乘的方法包括将每个被乘数分解成其16位分量。 这种方法导致处理器核心设计，允许重新使用乘法单元中的大部分逻辑。 乘法单元包括可以将各种尺寸的数据格式馈送到相同的乘法器电路的选择器。 提供多个数据转换路径并馈入单个压缩电路和单个可配置全加器电路。

公开(公告)号：US5963047A

公开(公告)日：1999-10-05

申请号：US917148

申请日：1997-08-25

申请人： David Kwong ,  Huijun Jeffrey Cui

发明人： David Kwong ,  Huijun Jeffrey Cui

IPC分类号： H03K19/003 ,  H03K19/0185

CPC分类号： H03K19/00361

摘要： A CMOS output buffer has as pull-downs a smaller driver transistor and a larger driver transistor. Both transistors drive the output low in parallel initially during a voltage transition, but the larger transistor is disabled for the remainder of the output voltage swing when reflections and ringing occur. A pulse is generated by a transition detector when an input to the output buffer transitions low. The pulse generated disables the larger driver for a short period of time but later re-enables the driver. Thus the large driver remains on after the switching is complete, providing large IOH and IOL static currents. The pulse is long enough to keep the large driver disabled while reflections are received and ringing occurs after the voltage transition. A Resistor in series with the smaller driver transistor absorbs these reflections. The output impedance is pulsed to the higher impedance of the first stage when ringing occurs at the end of the voltage transition, but after the pulse ends, the lower impedance of the large driver is seen. Pulses are generated when any neighboring output changes. The pulse generated is sent to all neighboring output buffers to disable their large drivers when noise in injected into the power or ground supplies.

摘要翻译： CMOS输出缓冲器具有较小的驱动晶体管和较大驱动晶体管的下拉电阻。 两个晶体管最初在电压转换期间并联驱动输出低电平，但是当出现反射和振铃时，较大的晶体管将被禁止输出电压摆幅的其余部分。 当输出缓冲器的输入变为低电平时，转换检测器产生脉冲。 生成的脉冲会在较短的时间内禁用较大的驱动程序，但稍后重新启用驱动程序。 因此，在开关完成后，大的驱动器保持接通，从而提供大的IOH和IOL静电流。 脉冲长度足以保持大驱动器禁用，同时接收反射并在电压转换后发生振铃。 与较小的驱动晶体管串联的电阻吸收这些反射。 当在电压转换结束时发生振铃时，输出阻抗被脉冲到第一级的较高阻抗，但是在脉冲结束之后，看到大驱动器的阻抗较低。 当任何相邻的输出变化时产生脉冲。 所产生的脉冲被发送到所有相邻的输出缓冲器，以在注入电源或地面的噪声供给时禁用它们的大驱动器。