AR# 1942

XC4000XL: VTT connections on 4000XL pinouts...

Description

Keywords: vtt, pinout, xl

Urgency: Standard

General Description:

VTT connections were initially anticipated in the preliminary
XL pinouts to be IO voltage level connections to allow the
3.3volt XL devices, and future voltage migrations, to properly
interface the IO to other 5 volt devices. Later testing showed
that these were not necessary for the 3.3 volt parts. As a
result the VTT connections for the 3.3volt XL parts were left
unbonded (N.C.).

Solution

These VTT pins may become VCC connections later on so, users can either leave them unconnected, or tie them to VCC.

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AR# 1942
Date	09/29/2008
Status	Archive
Type	General Article

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