Common Terminology

Some of the common terms used extensively in this document are ownership, function, logic, region, and fence. These terms are defined as follows:

Ownership (physical/logical)

The concept of physical versus logical ownership is an important concept to understand when using the IDF. This concept is described in detail in the section Concept of Ownership.

Function

A collection of logic that performs a specific operation (for example, an AES encryptor).

Logic

Circuits used to implement a specific function (e.g., flip-flop, look up table, and RAM).

Isolated Region/Pblock

A physical construct used to restrict placement of logic to a specific region of the device.

Fence

The concept of physical versus logical ownership is an important concept comprised of a set of unused tiles in which no routine or logic is present.

Trusted Routing

The routes that satisfy the rules outlined in the following figures. Trusted routing is automatically enabled after the HD.ISOLATED attribute is set to TRUE on at least one isolated module. These routes are a subset of existing routing resources that meet the following restrictions:

• No entry or exit point in the fence between isolated regions
• One source and one destination region
• Its entirety stays contained in the source/destination regions
• It does not come within one fence tile from another unintended isolation region

These rules act as a filter to all available routes in a given design. An example of routes that would be filtered are shown in the following figures. Example routes excluded for programmable interconnect points (PIPs), outside the intended isolation regions or proximity to unintended isolation regions, are also shown.