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docs: Update images
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gregdavill committed Dec 13, 2021
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With onboard DDR3, High Speed USB and Ethernet.

## Latest Revision:
* __Stable:__ [ButterStick r1.0](hardware/ButterStick_r1.0/) (Available from: [GroupGets](https://store.groupgets.com/products/butterstick-fpga-development-board))
* __Latest Release:__ [ButterStick r1.0](hardware/ButterStick_r1.0/)
* Assembled PCBs available: [GroupGets](https://store.groupgets.com/products/butterstick-fpga-development-board)
* Bare PCBs available: [Tindie](https://www.tindie.com/products/greeeg/butterstick-r10-bare-circuit-board)

Previous Revisions:
* [ButterStick r0.2](hardware/ButterStick_r0.2/)
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The ButterStick can be configured in different variants,
the part number defines which FPGA and DDR3 parts are installed.

```
ButterStick-r1.0-[Memory gigabits]-[FPGA density]
```
`ButterStick-r1.0-[Memory gigabits]-[FPGA density]`

| | ButterStick-r1.0-2G-25F | ButterStick-r1.0-2G-85F | ButterStick-r1.0-8G-85F |
|------|-------------------------|-------------------------|-------------------------|
| FPGA | LFE5UM5G-25F-8BG381C | LFE5UM5G-85F-8BG381C | LFE5UM5G-85F-8BG381C |
| DDR3 | 2x MT41K64M16TW-107 | 2x MT41K64M16TW-107 | 2x MT41K256M16TW-107 |
| | ButterStick-r1.0-2G-25F | ButterStick-r1.0-2G-85F | ButterStick-r1.0-8G-85F |
|-------|-------------------------|-------------------------|-------------------------|
| FPGA | LFE5UM5G-25F-8BG381C | LFE5UM5G-85F-8BG381C | LFE5UM5G-85F-8BG381C |
| DDR3 | 2x MT41K64M16TW-107 | 2x MT41K64M16TW-107 | 2x MT41K256M16TW-107 |

The 25F also has the following limitations on the ButterStick:
* 25F Only provides 2x SERDES lanes.
* 25F does not connect I/O pins S8/S9 on SYZYGY.C


![alt-text](documentation/images/800px/butterstick_r1d0_001.jpg "Populated r1.0 board front with stylish unpopulated board backdrop")
![alt-text](documentation/images/800px/butterstick_r1d0_002.jpg "Populated r1.0 board back with stylish unpopulated board backdrop")
![alt-text](documentation/images/800px/butterstick_r1d0_004.jpeg "Populated r1.0 board front")
![alt-text](documentation/images/800px/butterstick_r1d0_005.jpeg "Populated r1.0 board back")
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