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AR# 34114

Configuration System ACE - POR_RESET assertion might cause JTAG failures

Description

JTAG issues might occur when POR_RESET is logic 1.

Solution

Customersreport a "disconnect" between the TSTTDI and CFGTDO (or between TST.. inputs and CFG.. outputs of any other JTAG signals). Typically, it is reported that even whendriving TSTTDI, nothing comes out of CFGTDO. This is caused by POR_RESET being logic 1, which puts the internal System ACE controller logic into reset.

The problem should go away by pulling POR_RESET (and POR_BYPASS) to logic 0.

AR# 34114
Date Created 04/29/2010
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • System ACE