AR# 10447

3.5 FPGA Express - Virtex-II library support

描述

Keywords: Virtex, II, Virtex-II, library, primitive, IO, I/O

Urgency: Standard

General Description:
There are a number of primitives that FPGA Express version 3.5 does not yet recognize;
these are:

"Core" cells:

BUFGMUX
BUFGMUX_1
ICAP_VIRTEX2
MULT18X18
ORCY
RAMB16_S1
RAMB16_S2
RAMB16_S4
RAMB16_S9
RAMB16_S18
RAMB16_S36

I/O Cells:

Please see (Xilinx Solution 10900) for information on specifying I/O standards.

解决方案

The "core" cells will not present a problem, with the possible exception of the BUFGMUX.
Because FPGA Express will not recognize the BUFGMUX as a valid primitive, FPGA
Express will treat it as a black box. This will cause FPGA Express to insert an IBUF in
front of a BUFGMUX.

You should instantiate the IBUFG preceding the two clock inputs of the BUFGMUX; FPGA
Express recognizes the IBUFG as a valid I/O buffer, causing it to not insert I/O buffers before
the IBUFGs.
AR# 10447
日期 08/21/2002
状态 Archive
Type 综合文章