taskIII【菜鸟慢慢飞吧】

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taskIII

Pad to Pad
---------------+---------------+---------+
Source Pad |Destination Pad| Delay |
---------------+---------------+---------+
a<0> |cout | 10.124|
a<0> |s<0> | 6.347|
a<0> |s<1> | 8.815|
a<0> |s<2> | 9.383|
a<0> |s<3> | 10.487|
a<1> |cout | 8.793|
a<1> |s<1> | 7.304|
a<1> |s<2> | 8.052|
a<1> |s<3> | 9.156|
a<2> |cout | 7.680|
a<2> |s<2> | 6.820|
a<2> |s<3> | 8.043|
a<3> |cout | 7.972|
a<3> |s<3> | 7.215|
b<0> |cout | 9.028|
b<0> |s<0> | 6.959|
b<0> |s<1> | 7.719|
b<0> |s<2> | 8.287|
b<0> |s<3> | 9.391|
b<1> |cout | 9.564|
b<1> |s<1> | 7.306|
b<1> |s<2> | 8.823|
b<1> |s<3> | 9.927|
b<2> |cout | 8.145|
b<2> |s<2> | 6.950|
b<2> |s<3> | 8.508|
b<3> |cout | 7.565|
b<3> |s<3> | 7.226|
sub |cout | 10.074|
sub |s<1> | 8.765|
sub |s<2> | 9.333|
sub |s<3> | 10.437|
---------------+---------------+---------+

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1楼2015-05-20 13:15回复

Experiment3. Arithmetic Logic Unit
Task. Design a 8-bit ALU (Arithmetic Logic Unit)
Introduction:
An arithmetic logic unit (ALU) is a digital electroniccircuit that performs arithmetic and bitwise logical operations on integerbinary numbers. It is a fundamental building block of the central processingunit (CPU) found in many computers. This is in contrast to a floating-pointunit (FPU), which is a digital circuit that operates on floating point numberswith the aid of one or more internal ALUs. Powerful and complex ALUs are oftenused in modern, high performance CPUs, FPUs and graphics processing units(GPUs). A single CPU, FPU or GPU may contain multiple ALUs.
The inputs to an ALU are the data to be operated on(called operands) and a code indicating the operation to be performed; theALU's output is the result of the performed operation. In many designs, the ALUalso exchanges additional information with a status register, which relates tothe result of the current or previous operations. A common n-bit ALU is shownbelow. The n-bit inputs A and B are operands. The m-bit Sel signal determines the operation tobe performed so there are at most 2m operation modes in this ALU.The n-bit output F is the operationresult. The Cin is the carry-ininput and Cout is the carry-inoutput.

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2楼2015-05-20 14:29