Answers Database
Virtex Configuration: How many loads can the configuration pin CCLK drive?
Record #7383
Product Family: Hardware
Product Line: Virtex
Product Part: Virtex General Hardware
Problem Title:
Virtex Configuration: How many loads can the configuration pin CCLK drive?
Problem Description:
Urgency: Standard
General Description: How many loads can CCLK drive? In a daisy chained
application, there could be multiple PROMs and FPGAs driven by a single CCLK
Solution 1:
The rule of thumb is 8 loads maximum on a single CCLK. A separate driver might
be necessary for more than 8 loads. In addition, the faster the configuration rate
is, the greater the possibility a driver will be needed for multiple loads.
An alternative would be to break up one long configuration chain into
two(or more) smaller chains so there will be multiple Masters.
This will effectively reduce the load on CCLK
End of Record #7383 - Last Modified: 08/26/99 14:23 |
