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!

AR# 194

JTAG - How to use EXTEST instruction before configuration in a XC4K/XC5K device?

Description

Keywords: xc4000, xc5200, extest, program pin, JTAG

Urgency: standard

General Description:

How to execute the EXTEST instruction before configuration?

解决方案

If the /PROGRAM pin is held low, the Boundary Scan registers for EXTEST
will reset and not work. Releasing /PROGRAM, but holding the INIT low will halt configuration
just at the start. With the INIT signal held low, you may then
execute the EXTEST instruction.

The only other way to use the EXTEST instruction is to do so after
configuration has completed.
AR# 194
创建日期 08/21/2007
Last Updated 09/30/2008
状态 Archive
Type 综合文章