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AR# 61155

7-Series GTH Wizard v3.2 - GT Wizard generates wrong attributes

描述

When I use the Vivado 2013.4 or 2014.1 GTH Wizard, it generates incorrect GT attributes.
 
The example design can pass functional simulation but it fails to work on board.

I have selected "SRIO Gen2 Multiple lanes", 6.25Gbps, 156.25MHz REFCLK TX/RX QPLL

解决方案

The generated attribute "QPLL_FBDIV_TOP" (QPLL_FBDIV_IN) is wrong.

However if you select "Start from scratch" and the same settings, the attribute is correct.

The incorrect value is 40, the correct value should be 80.

The problem cannot be seen in simulation.
 
Both 40 and 80 can work here.
 
QPLL_FBDIV_IN=40, RXOUT_DIV=1
QPLL_FBDIV_IN=80, RXOUT_DIV=2
 
However, GTH QPLL VCO should be larger than 8G.
 
As a result QPLL_FBDIV_IN=40 is wrong.
 
This will be fixed in the next version of the wizard.
AR# 61155
日期 06/24/2014
状态 Active
Type 综合文章
器件
IP
的页面