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3.4 Properties of the Arithmetic Units on FPGA 77<br />

U(i)<br />

c dt/dx<br />

StateInReg<br />

StateBRAM<br />

0,0 0,1<br />

1,0 1,1<br />

* * -<br />

* * -<br />

+ *<br />

+ *<br />

/2 /2<br />

/2 /2<br />

-<br />

Flux E-W<br />

-<br />

Flux N-S<br />

D<br />

D Nx<br />

-<br />

-<br />

+<br />

*<br />

-<br />

Update<br />

U(i+1)<br />

Figure 3.3: The arithmetic unit of the second order scheme

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