APA600 datasheet(11/178 Pages) ACTEL

11 / 178 page

ProASICPLUS Flash Family FPGAs

v5.9

2-1

General Description

Routing Resources

The routing structure of ProASICPLUS devices is designed

to provide high performance through a flexible four-

level hierarchy of routing resources: ultra-fast local

resources, efficient long-line resources, high-speed, very

long-line

resources,

and

high

performance

global

networks.

The ultra-fast local resources are dedicated lines that

allow the output of each tile to connect directly to every

input of the eight surrounding tiles (Figure 2-1).

The efficient long-line resources provide routing for

longer distances and higher fanout connections. These

resources vary in length (spanning 1, 2, or 4 tiles), run

both vertically and horizontally, and cover the entire

ProASICPLUS device (Figure 2-2 on page 2-2). Each tile can

drive signals onto the efficient long-line resources, which

can in turn access every input of every tile. Active buffers

are inserted automatically by routing software to limit

the loading effects due to distance and fanout.

The high-speed, very long-line resources, which span the

entire device with minimal delay, are used to route very

long or very high fanout nets. (Figure 2-3 on page 2-3).

The high-performance global networks are low-skew,

high fanout nets that are accessible from external pins or

from internal logic (Figure 2-4 on page 2-4). These nets

are typically used to distribute clocks, resets, and other

high fanout nets requiring a minimum skew. The global

networks are implemented as clock trees, and signals can

be introduced at any junction. These can be employed

hierarchically with signals accessing every input on all

tiles.

Figure 2-1 • Ultra-Fast Local Resources

Inputs

Ultra-Fast

Local Lines

(connects a tile to the

adjacent tile, I/O buffer,

or memory block)

APA600 Datasheet(PDF) 11 Page - Actel Corporation

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