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© 2002 by CRC Press LLC<br />

TABLE 13.3 Dynamic Unit Delays<br />

Unit<br />

No. of Dynamic<br />

Gate Levels Delay (FO4)<br />

8:1 Mux latch N/A 2.9<br />

Carry save adder 1 1.4<br />

Group-4 merge 1 1.5<br />

AND6 1 2.3<br />

53 × 53-bit multiplier reduction array 9 16.5<br />

161-bit aligner 5 10<br />

160-bit adder 5 11.1<br />

13-bit 3-operand adder 5 9.3<br />

53-bit increment 4 7.5<br />

130-bit shifter 3 5.4<br />

64-bit carry lookahead adder 3 6.8<br />

64 entry, 64-bit 6R4W register file N/A 8.3<br />

64-kB sum addressed dual-port cache access N/A 16.4<br />

delay (ns)<br />

1.8<br />

1.6<br />

1.4<br />

1.2<br />

0.8<br />

0.6<br />

0 5 10<br />

power (mW)<br />

15 20<br />

FIGURE 13.8 Power vs. delay of device sizings of condition code generator arithmetic macro.<br />

Footed:Unfooted Delay<br />

FIGURE 13.9 Performance potential of unfooted domino.<br />

2<br />

1<br />

1.25<br />

1.2<br />

1.15<br />

1.1<br />

1.05<br />

1<br />

4xwide foot 2xwide foot<br />

1 2 3 4<br />

Unfooted Stack Height

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