| RAMB36 features |
| =============== |
| |
| This fuzzer emits features that only are used in the RAMB36E1 cell. There are |
| 3 categories: |
| |
| - ECC |
| - RAM extension |
| - Odd address modes |
| |
| Odd address modes |
| ----------------- |
| |
| Most RAMB36E1 address widths are expressed by configuring the underlying |
| RAMB18E1 to handle half of the data. So `RAMB36.READ_WIDTH = 4` is |
| expressed as `RAM18_Y0.READ_WIDTH = 2` and `RAM18_Y1.READ_WIDTH = 2`. However |
| two address widths (1 and 9) are odd (e.g. not divisible by 2). In these |
| cases, a RAMB36E1 specific feature is used. So `RAMB36.READ_WIDTH = 9` is |
| expressed as: |
| |
| - `RAMB18_Y0.READ_WIDTH_4` |
| - `RAMB18_Y1.READ_WIDTH_4` |
| - `RAMB36.BRAM36_READ_WIDTH_1` |
| |
| and `RAMB36.READ_WIDTH = 1` is expressed as: |
| |
| - `RAMB18_Y0.READ_WIDTH_1` |
| - `RAMB18_Y1.READ_WIDTH_1` |
| - `RAMB36.BRAM36_READ_WIDTH_1` |
