Design and Development of Efficient Energy Systems. Группа авторов

result obtained from vertex-4 FPGA. An 8-bit VM requires 418 slices, 729 LUT and 67 IOB shown in Table 2.2. A similar effect is verified with cadence NCSIM and the implementation result confirmed with RTL compiler at gpdk 180nm technology. The simulation result shows that

Table 2.2 FPGA utilization summary report.

Device utilization summary
Logic utilizations	Used	Available	Utilization
Slices	418	1672	4%
4 input LUTs	729	17344	4%
Bounded IOBs	67	250	26%

      The case I Input A=8’d136 and B=8’d119 result in multiplier values p=16’h16184.

      Case II Input A=8’d141 and B=8’d124 result in multiplier values p=16’h17484.

      Case III Input A=8’d145 and B=8’d129 result in multiplier values p=16’h18834.

2.4 Results and Discussion

      The performance parameter of 8-bit VM is judged by power consumption, delay, and area report obtained by the cadence RTL compiler. Completed implementation of an 8-bit Vedic multiplier is through the combinatorial block. The usage of the compressor reduces the requirement of resources. As the number of the logic gate but increases the interconnecting wires. Similarly, area requirements to interface multiple compressors significantly enhance the area and delay. In this section area, power and delay are presented due to logical resources and wires.

      2.4.1 Instance Power

This pie chart in Figure 2.12 presents the instance power used in the 8x8 Vedic Multiplier. In this chart, g1 and g2 determine compressor 10to4 and its usage of instance power is 15.79%. z1 and z2 define compressor 8to4, and its usage of instance power is 12.93%. d1 and d2 limit compressor 9to4 and its usage of instance power is 14.29%. N1 and N2 is a compressor of 7to3 whose power consumption is 8.19% of total power. M1 represents compressor 6to3, and its usage of instance power is 4.02%. V2 defines compressor 5to3, and its usage of instance power is 2.33%. Remaining all other compressors like t1 represents compressor 4to3, v1 represents compressor 5to3 and h1 defines about compressor 3to2 usage of instance power is 40.48%. An 8-bit Vedic more multiple logical blocks consume only 59.52% of total power. 40.48% of total power is consumed by another factor. The similar power distribution of the 16-bit multiplier is presented in Figure 2.13. Compressor block requires 37.78% of total power which 62.22% of total power consumed by other factors like wire.

Figure 2.12 Instance power usage of 8X8 vedic multiplier.

Figure 2.13 Instance power usage of 16X16 VM.

      2.4.2 Net Power

This pie chart in Figure 2.14 defines the Net power used in the 8x8 Vedic Multiplier. The identification of the power-hungry block is identified from this chart. In this chart, g1 and g2 determine compressor 10to4; consumes 5.64% of the total net power. z1 and z2 define compressor 8to4, and its usage of net power is 3.72%. d1 and d2 define compressor 9to4, and its usage of net power is 4.27%. n1 and n2 define compressor 7to3, and its usage of net power is 2.29%. m1 defines compressor 6to3, and its usage of net power is 1.23%. v2 defines compressor 5to3, and its usage of net power is 0.60%. Remaining all other compressors like t1 denotes about compressor 4to3, v1 represents compressor 5to3 and h1defines about compressor 3to2 usage of net power is 82.24%. This pie chart in Figure 2.15 defines the Net power distribution in the 16-bit multiplier.

Figure 2.14 Net power usage of 8X8 VM.

Figure 2.15 Net power usage of 16X16 VM.

      2.4.3 8-Bit Multiplier

Table 2.3 presents the cell area requirement of the 8x8 Vedic Multiplier. Cell area report models the number of the basic cell requires to the design. To implement this project 139 cells are required, and the area which is obtained by cells is 1517, and the net area is “zero”. The total area which is accomplished is 1517, and there is no Wire Load for this Vedic Multiplier.

Table 2.3 Cell area of 8x8 vedic multiplier.

Instance	Cells	Cell area	Net area	Total area	Wire load
Vedic Multiplier	139	1517	0	1517	<none> (D)

Table 2.4 Power constraints of 8x8 vedic multiplier.

Instance	Cells	Leakage power(nW)	Dynamic power(nW)	Total Скачать книгу В начало < 11 12 13 14 15 16 17 18 19 20 > В конец