This is because Spartan-6 does not have a built-in FIFO primitive.
It is only available on Virtex-4, Virtex-5 and Virtex-6.
This information is contained in the Datasheet for the core.
| AR# 46359 | |
|---|---|
| Date | 09/10/2014 |
| Status | Active |
| Type | General Article |
| Devices |
|
| IP |
|