This is one of the decoupling caps between VCCINT 1.8v & GND. As you can see, the 1.8v dips down to 1.625. This creates havoc with the processing inside the Altera EP20K200E which has clocks running at 133MHz, 125MHz, 95MHz, & 24MHz.
16KB ftp://ftp.point-lab.com/quartus/Public/ProtelUsers/NoiseVcc18-2ns.png 14KB ftp://ftp.point-lab.com/quartus/Public/ProtelUsers/NoiseVcc18-4ns.png Here is my current decoupling caps for the 1.8v. 4 x 0.1uf smd 0805 ceramic. 3 x 470uf electrolytic. See the problem? I originally had 32 x 0.1uf, but some rush work with cut & paste at one time about 2 month ago left me with this to work with. I need a temp fix where I only have 4 sets of access points around the APEX part with nice Vias to 1.8v. I can't get my hand on the Wima caps, any other solutions, or, recommendations? ____________ Brian Guralnick [EMAIL PROTECTED] Voice (514) 624-4003 Fax (514) 624-3631 ************************************************************************ * Tracking #: F8D40AA73622DF4FAC4C16E5D3430E081E9BB4A5 * ************************************************************************ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *