In 13.4 CORE Generator, ChipScope IBERT Wizard for Spartan-6 FPGA will only allow GTP designs to be created within limited ranges. Below is a chart that lists the tools accepted values in comparison to the values that are acceptable from the data sheet. The values that are specified within the data sheet can be achieved with the workaround below.
| Spartan-6 Speed Grade -2 | ||
| Symbol | Data Sheet Speeds Gb/s | Coregen Speeds Gb/s |
| FGTPRANGE1 | 1.88 to 2.7 | 2.45 to 2.5 |
| FGTPRANGE2 | 0.94 to 1.62 | 1.22 to 1.62 |
| FGTPRANGE3 | 0.6 to 0.81 | 0.614 to 0.81 |
| Spartan-6 Speed Grade -3N | ||
| Symbol | Data Sheet Speeds Gb/s | Coregen Speeds Gb/s |
| FGTPRANGE1 | 1.88 to 3.2 | 2.45 to 3.125 |
| FGTPRANGE2 | 0.94 to 1.62 | 1.22 to 1.62 |
| FGTPRANGE3 | 0.6 to 0.81 | 0.614 to 0.81 |
| Spartan-6 Speed Grade -3 | ||
| Symbol | Data Sheet Speeds Gb/s | Coregen Speeds Gb/s |
| FGTPRANGE1 | 1.88 to 3.2 | 2.45 to 3.125 |
| FGTPRANGE2 | 0.94 to 1.62 | 1.22 to 1.62 |
| FGTPRANGE3 | 0.6 to 0.81 | 0.614 to 0.81 |
| AR# 45876 | |
|---|---|
| Date | 05/19/2012 |
| Status | Active |
| Type | Known Issues |
| Devices | |
| Tools | |