ATT3042 Просмотр технического описания (PDF) - Unspecified

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ATT3042

Field-Programmable Gate Arrays

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Data Sheet

February 1997

ATT3000 Series Field-Programmable Gate Arrays

Programmable Interconnect (continued)

Direct Interconnect

Direct interconnect (shown in Figure 11) provides the

most efficient implementation of networks between

adjacent logic or IOBs. Signals routed from block to

block using the direct interconnect exhibit minimum

interconnect propagation and use no general intercon-

nect resources. For each CLB, the .x output may be

connected directly to the .b input of the CLB immedi-

ately to its right and to the .c input of the CLB to its left.

The .y output can use direct interconnect to drive the .d

input of the block immediately above, and the .a input

of the block below. Direct interconnect should be used

to maximize the speed of high-performance portions of

logic. Where logic blocks are adjacent to IOBs, direct

connect is provided alternately to the IOB inputs (.i)

and outputs (.o) on all four edges of the die. The right

edge provides additional direct connects from CLB out-

puts to adjacent IOBs. Direct interconnections of IOBs

with CLBs are shown in Figure 12.

Figure 11. Direct Interconnect

Lucent Technologies Inc.

11

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