UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!
  1. Xilinx - All Programmable
  2. Support
  3. AR# 13018: 4.1is3 ECS - How do I use the TDO pin for regular I/O in 4K(XL)/Spartan(-XL) chips?

AR# 13018

4.1is3 ECS - How do I use the TDO pin for regular I/O in 4K(XL)/Spartan(-XL) chips?

Description

Keywords: TDO, BSCAN, Spartan, schematic, symbol, ECS

Urgency: Standard

General Description:
I would like to use the TDO pin of my device as a regular I/O. How do I do this?

Solution

1

A TDO symbol does not currently exist in ECS. Therefore, you must create a symbol by instantiating the TDO in HDL and generating a symbol for it under "Design Entry Utilities". (Instantiations can be found in Resolutions 2 and 3.)

This issue is fixed in the latest 4.2i service pack, available at:
http://support.xilinx.com/support/techsup/sw_updates
The first service pack containing the fix is 4.2i Service Pack 2.

2

VHDL Instantiation of TDO:

component TDO
port(
O : in STD_ULOGIC);
end component;

3

Verilog Instantiation of TDO:

module TDO(O);
input O;
endmodule
AR# 13018
Date 08/11/2003
Status Archive
Type General Article
Page Bookmarked