AR# 12770

5.1i XST - 3-state control logic is not replicated for each IOB

描述

Keywords: XST, 3, three, tri, state, tristate, VHDL, IOB

Urgency: Standard

General Description:
When I synthesize a design with 3-state control, XST does not replicate the logic for each IOB; one 3-state control logic is created for a bus of bidirectional ports.

解决方案

To avoid this problem, change the synthesis pack option as follows:

1. Right-click on Synthesize -> Properties.
2. Choose "Xilinx-Specific Options".
3. Select "Pack Registers into IOBs".
4. Change the selection from "Auto" to "Yes".
AR# 12770
日期 10/20/2005
状态 Archive
Type 综合文章