Answers Database
XC5200 JTAG - Sample/Preload in a XC5200 appears to work like BYPASS
Record #992
Product Family: Hardware
Product Line: 5200
Product Part: 5200
Problem Title:
XC5200 JTAG - Sample/Preload in a XC5200 appears to work like BYPASS
Problem Description:
Urgency: standard
General Description:
After loading the SAMPLE/PRELOAD instruction in a 5K device, the
data being shifted in to the device starts appearing on the TDO pin
one TCK later. In other words, the SAMPLE/PRELOAD instruction appears
to work like the BYPASS instruction.
All other instructions appear to work correctly.
Solution 1:
If the XC5200 /PROGRAM pin is held low, the SAMPLE/PRELOAD instruction
can not be executed. Before executing boundary scan instructions
in the XC5200, make sure that the /PROG pin is not held low.
End of Record #992 - Last Modified: 01/26/00 15:10 |
