摘要:
A method for operand width reduction is described, wherein two N-bit input operands (A, B) of a bit width of N are processed and two M-bit output operands (A′, B′) of a reduced bit width of M are generated in a way, that a post-processing comprising an M-bit adder function followed by saturation to M bits performed on said two M-bit output operands (A′, B′) provides an M-bit result equal to an M-bit result of an N-bit modulo adder function of the two N-bit input operands (A, B), followed by a saturation to M bits. Further an electronic computing circuit (1, 5) is described performing said method. Additionally a computer system comprising such an electronic computing circuit is described.
摘要:
A digital system and method for scanning sequential logic elements are disclosed. The digital system may comprise a plurality of sequential logic elements subdivided into power domains, wherein at least one of the power domains is power gated; a scan chain configured for processing a scan data sequence; a scan enable switch configured for controlling a scan mode; and at least one shadow engine, wherein the at least one shadow engine comprises a control circuit. At least some of the power domains may be interconnected to the scan chain with the scan enable switch, and the scan enable switch may control the scan mode by asserting a scan enable signal. The at least one power gated power domain with one or more sequential logic elements to be power gated may be bypassed via the at least one shadow engine.
摘要:
A method for performing equivalence checking on logic circuit designs is disclosed. Within a composite netlist of an original version and a modified version of a logic circuit design, all level-sensitive sequential elements sensitized by a clock=0 are converted into buffers, and all level-sensitive sequential elements sensitized by a clock=1 are converted into level-sensitive registers. A subset of edge-sensitive sequential elements are selectively transformed into level-sensitive sequential elements by removing edge detection logic from the subset of the edge-sensitive sequential elements. A clock to the resulting sequential elements is then set to a logical “1” to verify the sequential equivalence of the transformed netlist.
摘要:
A semiconductor chip subdivided into power domains, at least one of the power domains is separately activated or deactivated and at least a part of the scannable storage elements are interconnected to one or more scan chains. At least one scan chain is serially subdivided into scan chain portions and the scan chain portion is arranged within one of the power domains. For at least one scan chain portion a bypass line is provided for passing by scan data and at least one select unit is provided for selecting between the bypass line and the corresponding scan chain portion in dependence of the activated or deactivated state of the corresponding power domains.
摘要:
A design structure to reduce power consumption within a clock gated synchronous circuit, said synchronous circuit comprising at least two successive stages, wherein each stage if activated propagates a data signal cycle by cycle to a succeeding stage the two successive stages comprising at least a control register, a data register and a local clock buffer (LCB) each, wherein each stage if activated propagates a data signal stored within the data register cycle by cycle to a data register of a succeeding stage.
摘要:
A binary logic unit to apply any Boolean operation on two input signals (va, vb) is described, wherein any Boolean operation to be applied on the input signals (va, vb) is defined by a particular combination of well defined control signals (ctl0, ctl1, ctl2, ctl3), wherein the input signals (va, vb) are used to select a control signal (ctl0, ctl1, ctl2, ctl3) as an output signal (vo) of the binary logic unit representing the result of a particular Boolean operation applied on the two input signals (va, vb). Furthermore a method to operate such a binary logic unit is described.
摘要翻译:描述了用于对两个输入信号(v SUB,a,B)进行任何布尔运算的二进制逻辑单元,其中应用于输入信号的任何布尔运算(v 由定义良好的控制信号(ct10,ct11,ct12,ct13)的特定组合定义,其中输入信号(v 用于选择作为输出信号的控制信号(ct1 0,ct1,ctl2,ct13)作为输出信号(v < / SUB>)表示施加在两个输入信号(v SUB a,v B b)上的特定布尔运算的结果的二进制逻辑单元。 此外,描述了操作这种二进制逻辑单元的方法。
摘要:
A permute unit includes permute logic and a crossbar working in cycles defined by clocking signals and generates one valid output vector per cycle by treating two parallel input vectors per cycle. The permute unit is double pumped by performing two inner cycles per outer cycle defined by the clocking signals. In the first inner cycle, first halves of both input vectors are treated. In the second inner cycle, second halves of both input vectors are treated and a valid output vector is generated from the results of the treatments within the first and the second inner cycles.
摘要:
The automatic verification of designs of digital circuits for their equivalence, wherein logic designs implemented in different hardware description languages (HDLs) and different design methodologies are compared. The designs (Code A, Code B) are modified by adding special wrappers (Wrapper A, Wrapper B), and used to equalize the timing of pairs of selected input signals and selected output signals of the logic designs. The wrappers drive certain signals of the designs that are not relevant for actual comparison, such signals including clock signals, clock control signals, scan-path signals, scan-path control signals, and reset signals. In a preferred embodiment, HDL descriptions of logic designs are analyzed. Based on this analysis, the wrappers are implemented as changes to the HDL descriptions. In another embodiment, RTL and/or gate-level netlists are analyzed and modified.
摘要:
Instead of having a processor with an instruction set architecture (ISA) that includes fixed architected operands, an improved processor supports additional characteristic bits for computing instructions (e.g., a multiply-add, load/store instructions). Such additional bits for the certain instructions influence the processing of these instructions by the processor. Also, a new instruction is introduced for further usage of the proposed method. Typically these additional characteristic bits as well as the instruction can be automatically generated by compilers to provide relatively well-suited instruction sequences for the processor.
摘要:
A method for operand width reduction is described, wherein two N-bit input operands (A, B) of a bit width of N are processed and two M-bit output operands (A′, B′) of a reduced bit width of M are generated in a way, that a post-processing comprising an M-bit adder function followed by saturation to M bits performed on said two M-bit output operands (A′, B′) provides an M-bit result equal to an M-bit result of an N-bit modulo adder function of the two N-bit input operands (A, B), followed by a saturation to M bits. Further an electronic computing circuit (1, 5) is described performing said method. Additionally a computer system comprising such an electronic computing circuit is described.